snapshot

bun.lock

@@ -12,6 +12,7 @@
         "bun-plugin-tailwind": "^0.1.2",
         "class-variance-authority": "^0.7.1",
         "clsx": "^2.1.1",
+        "highlight.js": "^11.11.1",
         "lucide-react": "^0.545.0",
         "marked": "^18.0.0",
         "react": "^19",
@@ -144,6 +145,8 @@
 
     "get-nonce": ["get-nonce@1.0.1", "", {}, "sha512-FJhYRoDaiatfEkUK8HKlicmu/3SGFD51q3itKDGoSTysQJBnfOcxU5GxnhE1E6soB76MbT0MBtnKJuXyAx+96Q=="],
 
+    "highlight.js": ["highlight.js@11.11.1", "", {}, "sha512-Xwwo44whKBVCYoliBQwaPvtd/2tYFkRQtXDWj1nackaV2JPXx3L0+Jvd8/qCJ2p+ML0/XVkJ2q+Mr+UVdpJK5w=="],
+
     "lucide-react": ["lucide-react@0.545.0", "", { "peerDependencies": { "react": "^16.5.1 || ^17.0.0 || ^18.0.0 || ^19.0.0" } }, "sha512-7r1/yUuflQDSt4f1bpn5ZAocyIxcTyVyBBChSVtBKn5M+392cPmI5YJMWOJKk/HUWGm5wg83chlAZtCcGbEZtw=="],
 
     "marked": ["marked@18.0.0", "", { "bin": { "marked": "bin/marked.js" } }, "sha512-2e7Qiv/HJSXj8rDEpgTvGKsP8yYtI9xXHKDnrftrmnrJPaFNM7VRb2YCzWaX4BP1iCJ/XPduzDJZMFoqTCcIMA=="],

package.json

@@ -16,6 +16,7 @@
     "bun-plugin-tailwind": "^0.1.2",
     "class-variance-authority": "^0.7.1",
     "clsx": "^2.1.1",
+    "highlight.js": "^11.11.1",
     "lucide-react": "^0.545.0",
     "marked": "^18.0.0",
     "react": "^19",

src/App.tsx

@@ -1,4 +1,5 @@
-import { NotesApp } from "@/components/NotesApp";
+import { NotesApp } from "@/features/notes/NotesApp";
+import "highlight.js/styles/github.css";
 import "./index.css";
 
 export function App() {

src/components/NotesApp.tsx

@@ -1,135 +0,0 @@
-import { useCallback, useEffect, useState } from "react";
-import type { Snippet } from "@/types/snippet";
-import { Button } from "@/components/ui/button";
-import { Input } from "@/components/ui/input";
-import { Label } from "@/components/ui/label";
-import { Select, SelectContent, SelectItem, SelectTrigger, SelectValue } from "@/components/ui/select";
-import { SnippetCard } from "@/components/SnippetCard";
-
-const SORT_OPTIONS = [
-  { value: "updated_desc", label: "Zuletzt geändert (neu zuerst)" },
-  { value: "updated_asc", label: "Zuletzt geändert (alt zuerst)" },
-  { value: "title_asc", label: "Titel A–Z" },
-  { value: "title_desc", label: "Titel Z–A" },
-] as const;
-
-type SortValue = (typeof SORT_OPTIONS)[number]["value"];
-
-export function NotesApp() {
-  const [query, setQuery] = useState("");
-  const [debouncedQuery, setDebouncedQuery] = useState("");
-  const [sort, setSort] = useState<SortValue>("updated_desc");
-  const [snippets, setSnippets] = useState<Snippet[]>([]);
-  const [loading, setLoading] = useState(true);
-  const [error, setError] = useState<string | null>(null);
-
-  useEffect(() => {
-    const t = window.setTimeout(() => setDebouncedQuery(query), 300);
-    return () => window.clearTimeout(t);
-  }, [query]);
-
-  useEffect(() => {
-    let cancelled = false;
-    (async () => {
-      setLoading(true);
-      setError(null);
-      try {
-        const params = new URLSearchParams();
-        if (debouncedQuery.trim()) params.set("q", debouncedQuery.trim());
-        params.set("sort", sort);
-        const res = await fetch(`/api/snippets?${params.toString()}`);
-        if (!res.ok) throw new Error(await res.text());
-        const data = (await res.json()) as Snippet[];
-        if (!cancelled) setSnippets(data);
-      } catch (e) {
-        if (!cancelled) setError(e instanceof Error ? e.message : "Laden fehlgeschlagen");
-      } finally {
-        if (!cancelled) setLoading(false);
-      }
-    })();
-    return () => {
-      cancelled = true;
-    };
-  }, [debouncedQuery, sort]);
-
-  const replaceSnippet = useCallback((s: Snippet) => {
-    setSnippets(prev => prev.map(x => (x.id === s.id ? s : x)));
-  }, []);
-
-  const removeSnippet = useCallback((id: number) => {
-    setSnippets(prev => prev.filter(x => x.id !== id));
-  }, []);
-
-  const createNew = async () => {
-    setError(null);
-    try {
-      const res = await fetch("/api/snippets", {
-        method: "POST",
-        headers: { "Content-Type": "application/json" },
-        body: JSON.stringify({ title: null, body: "", tags: [] }),
-      });
-      if (!res.ok) {
-        const err = (await res.json().catch(() => null)) as { error?: string } | null;
-        throw new Error(err?.error ?? res.statusText);
-      }
-      const created = (await res.json()) as Snippet;
-      setSnippets(prev => [created, ...prev]);
-    } catch (e) {
-      setError(e instanceof Error ? e.message : "Neues Snippet fehlgeschlagen");
-    }
-  };
-
-  return (
-    <div className="mx-auto flex w-full max-w-6xl flex-col gap-4 px-4 py-4 sm:px-5">
-      <header className="flex flex-col gap-3 sm:flex-row sm:flex-wrap sm:items-end sm:gap-3">
-        <div className="min-w-0 flex-1 space-y-1.5">
-          <Label htmlFor="search" className="text-xs text-muted-foreground">
-            Suche
-          </Label>
-          <Input
-            id="search"
-            value={query}
-            onChange={e => setQuery(e.target.value)}
-            placeholder="Ohne Prefix: Titel & Tags · tag:x · title:y · content:z"
-            autoComplete="off"
-            className="h-9"
-          />
-        </div>
-        <div className="w-full min-w-[min(100%,220px)] space-y-1.5 sm:w-72">
-          <Label htmlFor="sort" className="text-xs text-muted-foreground">
-            Sortierung
-          </Label>
-          <Select value={sort} onValueChange={v => setSort(v as SortValue)}>
-            <SelectTrigger id="sort" className="h-9 w-full">
-              <SelectValue placeholder="Sortierung" />
-            </SelectTrigger>
-            <SelectContent>
-              {SORT_OPTIONS.map(o => (
-                <SelectItem key={o.value} value={o.value}>
-                  {o.label}
-                </SelectItem>
-              ))}
-            </SelectContent>
-          </Select>
-        </div>
-        <div className="flex sm:shrink-0">
-          <Button type="button" className="h-9 w-full sm:w-auto" onClick={() => void createNew()}>
-            Neu
-          </Button>
-        </div>
-      </header>
-
-      {error ? <p className="text-sm text-destructive">{error}</p> : null}
-      {loading ? <p className="text-sm text-muted-foreground">Lade Snippets …</p> : null}
-
-      <div className="flex flex-col gap-4">
-        {!loading && snippets.length === 0 ? (
-          <p className="text-center text-sm text-muted-foreground">Keine Snippets. Mit „Neu“ starten.</p>
-        ) : null}
-        {snippets.map(s => (
-          <SnippetCard key={s.id} snippet={s} onReplace={replaceSnippet} onRemove={removeSnippet} />
-        ))}
-      </div>
-    </div>
-  );
-}

src/components/SnippetCard.tsx

@@ -1,263 +0,0 @@
-import { marked } from "marked";
-import { useEffect, useMemo, useState } from "react";
-import type { Snippet } from "@/types/snippet";
-import { Button } from "@/components/ui/button";
-import { Card, CardContent, CardFooter } from "@/components/ui/card";
-import { Dialog, DialogContent, DialogDescription, DialogFooter, DialogHeader, DialogTitle } from "@/components/ui/dialog";
-import { Input } from "@/components/ui/input";
-import { Textarea } from "@/components/ui/textarea";
-
-marked.setOptions({ gfm: true });
-
-function stringFieldForForm(v: string | null | undefined): string {
-  if (v == null) return "";
-  return typeof v === "string" ? v : "";
-}
-
-function tagsFromString(s: string): string[] {
-  return s
-    .split(",")
-    .map(t => t.trim())
-    .filter(Boolean);
-}
-
-function formatWhen(iso: string): string {
-  try {
-    return new Date(iso).toLocaleString();
-  } catch {
-    return iso;
-  }
-}
-
-type Props = {
-  snippet: Snippet;
-  onReplace: (s: Snippet) => void;
-  onRemove: (id: number) => void;
-};
-
-const mdBodyClassBase =
-  "snippet-md text-sm leading-relaxed [&_a]:text-primary [&_a]:underline [&_blockquote]:border-l-2 [&_blockquote]:border-muted-foreground/40 [&_blockquote]:pl-3 [&_blockquote]:italic [&_code]:rounded [&_code]:bg-muted [&_code]:px-1 [&_code]:py-0.5 [&_h1]:mb-2 [&_h1]:text-xl [&_h1]:font-semibold [&_h2]:mb-2 [&_h2]:text-lg [&_h2]:font-semibold [&_h3]:mb-1 [&_h3]:text-base [&_h3]:font-semibold [&_li]:ml-4 [&_ol]:list-decimal [&_pre]:overflow-x-auto [&_pre]:rounded-md [&_pre]:bg-muted [&_pre]:p-3 [&_ul]:list-disc";
-
-const mdBodyClassCard = `${mdBodyClassBase} max-h-[min(55vh,420px)] overflow-auto`;
-const mdBodyClassDialogPreview = `${mdBodyClassBase} min-h-0 flex-1 overflow-auto`;
-
-export function SnippetCard({ snippet, onReplace, onRemove }: Props) {
-  const pristineEmpty =
-    !stringFieldForForm(snippet.body) &&
-    (snippet.title == null || snippet.title.trim() === "") &&
-    (snippet.tags?.length ?? 0) === 0;
-
-  const [dialogOpen, setDialogOpen] = useState(pristineEmpty);
-  const [showPreview, setShowPreview] = useState(false);
-  const [dirty, setDirty] = useState(false);
-  const [body, setBody] = useState(() => stringFieldForForm(snippet.body));
-  const [title, setTitle] = useState(() => stringFieldForForm(snippet.title));
-  const [tagsStr, setTagsStr] = useState(() => (snippet.tags ?? []).join(", "));
-  const [busy, setBusy] = useState(false);
-  const [error, setError] = useState<string | null>(null);
-
-  const viewHtml = useMemo(
-    () => marked.parse(stringFieldForForm(snippet.body)) as string,
-    [snippet.body],
-  );
-
-  const previewHtml = useMemo(() => marked.parse(body) as string, [body]);
-
-  useEffect(() => {
-    if (dialogOpen) return;
-    setBody(stringFieldForForm(snippet.body));
-    setTitle(stringFieldForForm(snippet.title));
-    setTagsStr((snippet.tags ?? []).join(", "));
-  }, [dialogOpen, snippet.id, snippet.updated_at, snippet.body, snippet.title, snippet.tags]);
-
-  const hydrateFromSnippet = () => {
-    setBody(stringFieldForForm(snippet.body));
-    setTitle(stringFieldForForm(snippet.title));
-    setTagsStr((snippet.tags ?? []).join(", "));
-    setShowPreview(false);
-    setDirty(false);
-    setError(null);
-  };
-
-  const openDialog = () => {
-    hydrateFromSnippet();
-    setDialogOpen(true);
-  };
-
-  /** Dialog schließen; bei neuem leeren Snippet ohne Änderungen wieder entfernen. */
-  const requestDismiss = () => {
-    setDialogOpen(false);
-    if (pristineEmpty && !dirty) void deleteRemote(false);
-  };
-
-  const handleOpenChange = (open: boolean) => {
-    if (open) openDialog();
-    else requestDismiss();
-  };
-
-  const save = async () => {
-    setBusy(true);
-    setError(null);
-    try {
-      const res = await fetch(`/api/snippets/${snippet.id}`, {
-        method: "PATCH",
-        headers: { "Content-Type": "application/json" },
-        body: JSON.stringify({
-          title: title.trim() === "" ? null : title.trim(),
-          body,
-          tags: tagsFromString(tagsStr),
-        }),
-      });
-      if (!res.ok) {
-        const err = (await res.json().catch(() => null)) as { error?: string } | null;
-        throw new Error(err?.error ?? res.statusText);
-      }
-      const updated = (await res.json()) as Snippet;
-      onReplace(updated);
-      setDirty(false);
-      setDialogOpen(false);
-    } catch (e) {
-      setError(e instanceof Error ? e.message : "Speichern fehlgeschlagen");
-    } finally {
-      setBusy(false);
-    }
-  };
-
-  async function deleteRemote(askConfirm: boolean) {
-    if (askConfirm && !window.confirm("Snippet wirklich löschen?")) return;
-    setBusy(true);
-    setError(null);
-    try {
-      const res = await fetch(`/api/snippets/${snippet.id}`, { method: "DELETE" });
-      if (!res.ok && res.status !== 204) {
-        const err = (await res.json().catch(() => null)) as { error?: string } | null;
-        throw new Error(err?.error ?? res.statusText);
-      }
-      onRemove(snippet.id);
-    } catch (e) {
-      setError(e instanceof Error ? e.message : "Löschen fehlgeschlagen");
-    } finally {
-      setBusy(false);
-    }
-  }
-
-  const markDirty = () => setDirty(true);
-
-  return (
-    <>
-      <Card className="gap-0 py-3 text-left shadow-sm">
-        <CardContent className="px-4 pb-2 pt-1">
-          <div
-            role="button"
-            tabIndex={0}
-            title="Zum Bearbeiten klicken"
-            className="rounded-sm px-0.5 py-2 outline-none ring-offset-background focus-visible:ring-2 focus-visible:ring-ring"
-            onKeyDown={e => {
-              if (e.key === "Enter" || e.key === " ") {
-                e.preventDefault();
-                openDialog();
-              }
-            }}
-          >
-            <div
-              className={`${mdBodyClassCard}`}
-              dangerouslySetInnerHTML={{ __html: viewHtml }}
-            />
-          </div>
-        </CardContent>
-        <CardFooter className="flex flex-col gap-2 border-t px-4 pb-3 pt-2 sm:flex-row sm:items-end sm:justify-between">
-          <div className="grid w-full gap-1 text-sm sm:max-w-xl">
-            <div>
-              {snippet.title?.trim() ? (
-                <span className="font-medium text-foreground">{snippet.title}</span>
-              ) : (
-                <span className="text-sm font-normal italic tracking-wide text-muted-foreground">(Kein Titel)</span>
-              )}
-            </div>
-            <div className="text-muted-foreground">{snippet.tags.length ? snippet.tags.join(", ") : "Keine Tags"}</div>
-          </div>
-          <div className="flex w-full flex-col gap-2 sm:w-auto sm:items-end">
-            <div className="text-xs text-muted-foreground">Geändert: {formatWhen(snippet.updated_at)}</div>
-            <div className="flex flex-wrap gap-2">
-              <Button type="button" variant="secondary" disabled={busy} onClick={openDialog}>
-                Bearbeiten
-              </Button>
-              <Button type="button" variant="destructive" disabled={busy} onClick={() => void deleteRemote(true)}>
-                Löschen
-              </Button>
-            </div>
-            {error && !dialogOpen ? <p className="text-sm text-destructive">{error}</p> : null}
-          </div>
-        </CardFooter>
-      </Card>
-
-      <Dialog open={dialogOpen} onOpenChange={handleOpenChange}>
-        <DialogContent className="gap-0 p-0">
-          <DialogHeader className="shrink-0 space-y-1.5 border-b px-6 pb-4 pt-6 pr-14 text-center sm:text-start">
-            <DialogTitle>Snippet bearbeiten</DialogTitle>
-            <DialogDescription>Titel, Tags und Markdown. Vorschau optional einblenden.</DialogDescription>
-          </DialogHeader>
-
-          <div className="flex min-h-0 flex-1 flex-col gap-3 overflow-hidden px-6 py-4">
-            <Input
-              value={title}
-              onChange={e => {
-                markDirty();
-                setTitle(e.target.value);
-              }}
-              placeholder="Optionaler Titel"
-              className="shrink-0"
-            />
-            <Input
-              value={tagsStr}
-              onChange={e => {
-                markDirty();
-                setTagsStr(e.target.value);
-              }}
-              placeholder="Tags, kommagetrennt"
-              className="shrink-0"
-            />
-            <div
-              className={
-                showPreview
-                  ? "flex min-h-0 flex-1 flex-col gap-3 overflow-hidden lg:flex-row"
-                  : "flex min-h-0 flex-1 flex-col overflow-hidden"
-              }
-            >
-              <Textarea
-                value={body}
-                onChange={e => {
-                  markDirty();
-                  setBody(e.target.value);
-                }}
-                className="min-h-0 w-full flex-1 resize-none font-mono text-sm lg:min-h-0"
-                placeholder="Markdown …"
-              />
-              {showPreview ? (
-                <div
-                  className={`${mdBodyClassDialogPreview} rounded-md border bg-muted/30 p-3 lg:w-1/2`}
-                  dangerouslySetInnerHTML={{ __html: previewHtml }}
-                />
-              ) : null}
-            </div>
-            {error ? <p className="shrink-0 text-sm text-destructive">{error}</p> : null}
-          </div>
-
-          <DialogFooter className="shrink-0 flex-row flex-wrap items-center justify-between gap-3 border-t px-6 py-4 sm:flex-row sm:justify-between">
-            <Button type="button" variant="outline" size="sm" className="h-9" onClick={() => setShowPreview(v => !v)}>
-              {showPreview ? "Vorschau ausblenden" : "Vorschau"}
-            </Button>
-            <div className="flex flex-wrap items-center justify-end gap-2">
-              <Button type="button" variant="secondary" disabled={busy} onClick={requestDismiss}>
-                Abbrechen
-              </Button>
-              <Button type="button" disabled={busy} onClick={() => void save()}>
-                Speichern
-              </Button>
-            </div>
-          </DialogFooter>
-        </DialogContent>
-      </Dialog>
-    </>
-  );
-}

src/components/ui/card.tsx

@@ -49,7 +49,7 @@ function CardContent({ className, ...props }: React.ComponentProps<"div">) {
 
 function CardFooter({ className, ...props }: React.ComponentProps<"div">) {
   return (
-    <div data-slot="card-footer" className={cn("flex items-center px-6 [.border-t]:pt-6", className)} {...props} />
+    <div data-slot="card-footer" className={cn("flex items-center px-6 [.border-t]:pt-2", className)} {...props} />
   );
 }
 

src/components/ui/date-input.tsx

@@ -0,0 +1,25 @@
+import * as React from "react";
+
+import { cn } from "@/lib/utils";
+
+/** Styled native `<input type="date">` (Kalender-Popup bleibt browserabhängig). */
+const DateInput = React.forwardRef<HTMLInputElement, Omit<React.ComponentProps<"input">, "type">>(
+  ({ className, ...props }, ref) => (
+    <input
+      ref={ref}
+      type="date"
+      data-slot="date-input"
+      className={cn(
+        "date-field",
+        "text-foreground placeholder:text-muted-foreground selection:bg-primary selection:text-primary-foreground dark:bg-input/30 border-input h-9 w-full min-w-0 rounded-md border bg-transparent px-3 py-1 font-mono text-sm shadow-xs transition-[color,box-shadow] outline-none disabled:pointer-events-none disabled:cursor-not-allowed disabled:opacity-50",
+        "focus:border-ring focus:ring-[3px] focus:ring-ring/50 focus-visible:border-ring focus-visible:ring-[3px] focus-visible:ring-ring/50",
+        "aria-invalid:ring-destructive/20 dark:aria-invalid:ring-destructive/40 aria-invalid:border-destructive",
+        className,
+      )}
+      {...props}
+    />
+  ),
+);
+DateInput.displayName = "DateInput";
+
+export { DateInput };

src/components/ui/dialog.tsx

@@ -4,6 +4,14 @@ import * as React from "react";
 
 import { cn } from "@/lib/utils";
 
+/** Centered modal (default shadcn). */
+const dialogContentDefault =
+  "fixed left-1/2 top-1/2 z-50 flex min-h-0 w-[calc(100vw-1.5rem)] max-w-lg -translate-x-1/2 -translate-y-1/2 flex-col gap-4 overflow-hidden rounded-lg border bg-background p-6 shadow-lg duration-200 max-h-[min(92dvh,calc(100dvh-2rem))] data-[state=open]:animate-in data-[state=closed]:animate-out data-[state=closed]:fade-out-0 data-[state=open]:fade-in-0 data-[state=closed]:zoom-out-95 data-[state=open]:zoom-in-95";
+
+/** Full viewport; overrides centered positioning from the default recipe. */
+const dialogContentFullscreen =
+  "fixed inset-0 z-50 flex min-h-0 w-full flex-col gap-0 overflow-hidden rounded-none border bg-background p-0 shadow-lg duration-200 data-[state=open]:animate-in data-[state=closed]:animate-out data-[state=closed]:fade-out-0 data-[state=open]:fade-in-0 data-[state=closed]:zoom-out-95 data-[state=open]:zoom-in-95";
+
 function Dialog({ ...props }: React.ComponentProps<typeof DialogPrimitive.Root>) {
   return <DialogPrimitive.Root data-slot="dialog" {...props} />;
 }
@@ -36,20 +44,19 @@ const DialogOverlay = React.forwardRef<
 ));
 DialogOverlay.displayName = DialogPrimitive.Overlay.displayName;
 
-const DialogContent = React.forwardRef<
-  React.ElementRef<typeof DialogPrimitive.Content>,
-  React.ComponentPropsWithoutRef<typeof DialogPrimitive.Content>
->(({ className, children, ...props }, ref) => (
+export type DialogContentProps = React.ComponentPropsWithoutRef<typeof DialogPrimitive.Content> & {
+  variant?: "default" | "fullscreen";
+};
+
+const DialogContent = React.forwardRef<React.ElementRef<typeof DialogPrimitive.Content>, DialogContentProps>(
+  ({ className, children, variant = "default", ...props }, ref) => (
   <DialogPortal>
     <DialogOverlay />
     <DialogPrimitive.Content
       ref={ref}
       data-slot="dialog-content"
-      className={cn(
-        "fixed left-2 right-2 top-1/2 z-50 flex h-[calc(100dvh-2rem)] max-h-[calc(100dvh-2rem)] w-auto max-w-none -translate-y-1/2 flex-col gap-4 overflow-hidden rounded-lg border bg-background p-6 shadow-lg duration-200",
-        "data-[state=open]:animate-in data-[state=closed]:animate-out data-[state=closed]:fade-out-0 data-[state=open]:fade-in-0 data-[state=closed]:zoom-out-95 data-[state=open]:zoom-in-95",
-        className,
-      )}
+      data-variant={variant}
+      className={cn(variant === "fullscreen" ? dialogContentFullscreen : dialogContentDefault, className)}
       {...props}
     >
       {children}
@@ -62,7 +69,8 @@ const DialogContent = React.forwardRef<
       </DialogPrimitive.Close>
     </DialogPrimitive.Content>
   </DialogPortal>
-));
+  ),
+);
 DialogContent.displayName = DialogPrimitive.Content.displayName;
 
 function DialogHeader({ className, ...props }: React.ComponentProps<"div">) {

src/components/ui/input.tsx

@@ -9,7 +9,7 @@ function Input({ className, type, ...props }: React.ComponentProps<"input">) {
       data-slot="input"
       className={cn(
         "file:text-foreground placeholder:text-muted-foreground selection:bg-primary selection:text-primary-foreground dark:bg-input/30 border-input h-9 w-full min-w-0 rounded-md border bg-transparent px-3 py-1 text-base shadow-xs transition-[color,box-shadow] outline-none file:inline-flex file:h-7 file:border-0 file:bg-transparent file:text-sm file:font-medium disabled:pointer-events-none disabled:cursor-not-allowed disabled:opacity-50 md:text-sm",
-        "focus-visible:border-ring focus-visible:ring-ring/50 focus-visible:ring-[3px]",
+        "focus:border-ring focus:ring-[3px] focus:ring-ring/50 focus-visible:border-ring focus-visible:ring-[3px] focus-visible:ring-ring/50",
         "aria-invalid:ring-destructive/20 dark:aria-invalid:ring-destructive/40 aria-invalid:border-destructive",
         className,
       )}

src/components/ui/textarea.tsx

@@ -2,17 +2,21 @@ import * as React from "react";
 
 import { cn } from "@/lib/utils";
 
-function Textarea({ className, ...props }: React.ComponentProps<"textarea">) {
-  return (
+const Textarea = React.forwardRef<HTMLTextAreaElement, React.ComponentProps<"textarea">>(
+  ({ className, ...props }, ref) => (
     <textarea
+      ref={ref}
       data-slot="textarea"
       className={cn(
-        "border-input placeholder:text-muted-foreground focus-visible:border-ring focus-visible:ring-ring/50 aria-invalid:ring-destructive/20 dark:aria-invalid:ring-destructive/40 aria-invalid:border-destructive dark:bg-input/30 flex field-sizing-content min-h-16 w-full rounded-md border bg-transparent px-3 py-2 text-base shadow-xs transition-[color,box-shadow] outline-none focus-visible:ring-[3px] disabled:cursor-not-allowed disabled:opacity-50 md:text-sm",
+        "placeholder:text-muted-foreground selection:bg-primary selection:text-primary-foreground dark:bg-input/30 border-input min-h-16 w-full min-w-0 rounded-md border bg-transparent px-3 py-2 text-base shadow-xs transition-[color,box-shadow] outline-none disabled:pointer-events-none disabled:cursor-not-allowed disabled:opacity-50 md:text-sm field-sizing-content",
+        "focus:border-ring focus:ring-[3px] focus:ring-ring/50 focus-visible:border-ring focus-visible:ring-[3px] focus-visible:ring-ring/50",
+        "aria-invalid:ring-destructive/20 dark:aria-invalid:ring-destructive/40 aria-invalid:border-destructive",
         className,
       )}
       {...props}
     />
+  ),
 );
-}
+Textarea.displayName = "Textarea";
 
 export { Textarea };

src/features/notes/NotesApp.tsx

@@ -0,0 +1,189 @@
+import { useCallback, useEffect, useMemo, useState } from "react";
+import { formatTreeTagDisplay } from "@/lib/treeTagDisplay";
+import type { Snippet } from "@/types/snippet";
+import type { TagTreeNode } from "@/types/tagTree";
+import { SnippetCard } from "@/features/snippets/SnippetCard";
+import { TagTreeDialog } from "@/features/tag-tree/TagTreeDialog";
+import { NotesToolbar } from "@/features/notes/NotesToolbar";
+import type { SortValue } from "@/features/notes/sortOptions";
+
+export function NotesApp() {
+  const [query, setQuery] = useState("");
+  const [debouncedQuery, setDebouncedQuery] = useState("");
+  const [sort, setSort] = useState<SortValue>("updated_desc");
+  const [snippets, setSnippets] = useState<Snippet[]>([]);
+  const [loading, setLoading] = useState(true);
+  const [error, setError] = useState<string | null>(null);
+  const [tagTreeOpen, setTagTreeOpen] = useState(false);
+  const [tagTreeNodes, setTagTreeNodes] = useState<TagTreeNode[]>([]);
+  const [snippetListVersion, setSnippetListVersion] = useState(0);
+
+  useEffect(() => {
+    const t = window.setTimeout(() => setDebouncedQuery(query), 300);
+    return () => window.clearTimeout(t);
+  }, [query]);
+
+  useEffect(() => {
+    let cancelled = false;
+    void (async () => {
+      setLoading(true);
+      setError(null);
+      try {
+        const params = new URLSearchParams();
+        if (debouncedQuery.trim()) params.set("q", debouncedQuery.trim());
+        params.set("sort", sort);
+        const res = await fetch(`/api/snippets?${params.toString()}`);
+        if (!res.ok) throw new Error(await res.text());
+        const data = (await res.json()) as Snippet[];
+        if (!cancelled) setSnippets(data);
+      } catch (e) {
+        if (!cancelled) setError(e instanceof Error ? e.message : "Laden fehlgeschlagen");
+      } finally {
+        if (!cancelled) setLoading(false);
+      }
+    })();
+    return () => {
+      cancelled = true;
+    };
+  }, [debouncedQuery, sort, snippetListVersion]);
+
+  const fetchTagTree = useCallback(async () => {
+    try {
+      const res = await fetch("/api/tag-tree");
+      if (!res.ok) return;
+      setTagTreeNodes((await res.json()) as TagTreeNode[]);
+    } catch {
+      /* ignore */
+    }
+  }, []);
+
+  useEffect(() => {
+    void fetchTagTree();
+  }, [fetchTagTree]);
+
+  const treeColorByName = useMemo(() => {
+    const m: Record<string, string | null> = {};
+    for (const n of tagTreeNodes) {
+      m[n.name] = n.color;
+    }
+    return m;
+  }, [tagTreeNodes]);
+
+  const treeDisplayByName = useMemo(() => {
+    const m: Record<string, string> = {};
+    for (const n of tagTreeNodes) {
+      m[n.name] = formatTreeTagDisplay(n.name, n.label_prefix ?? null);
+    }
+    return m;
+  }, [tagTreeNodes]);
+
+  const replaceSnippet = useCallback((s: Snippet) => {
+    setSnippets(prev => prev.map(x => (x.id === s.id ? s : x)));
+  }, []);
+
+  const removeSnippet = useCallback((id: number) => {
+    setSnippets(prev => prev.filter(x => x.id !== id));
+  }, []);
+
+  const { snippetColumnLeft, snippetColumnRight } = useMemo(() => {
+    const left: Snippet[] = [];
+    const right: Snippet[] = [];
+    snippets.forEach((s, i) => {
+      if (i % 2 === 0) left.push(s);
+      else right.push(s);
+    });
+    return { snippetColumnLeft: left, snippetColumnRight: right };
+  }, [snippets]);
+
+  const createNew = async () => {
+    setError(null);
+    try {
+      const res = await fetch("/api/snippets", {
+        method: "POST",
+        headers: { "Content-Type": "application/json" },
+        body: JSON.stringify({ title: null, body: "", tags: [] }),
+      });
+      if (!res.ok) {
+        const err = (await res.json().catch(() => null)) as { error?: string } | null;
+        throw new Error(err?.error ?? res.statusText);
+      }
+      const created = (await res.json()) as Snippet;
+      setSnippets(prev => [created, ...prev]);
+    } catch (e) {
+      setError(e instanceof Error ? e.message : "Neues Snippet fehlgeschlagen");
+    }
+  };
+
+  return (
+    <div className="mx-auto flex w-full max-w-6xl flex-col gap-4 px-4 py-4 sm:px-5 xl:max-w-7xl min-[1800px]:max-w-none min-[1800px]:px-6 min-[2200px]:px-10">
+      <NotesToolbar
+        query={query}
+        onQueryChange={setQuery}
+        sort={sort}
+        onSortChange={setSort}
+        tagTreeCount={tagTreeNodes.length}
+        onOpenTagTree={() => setTagTreeOpen(true)}
+        onCreateNew={() => void createNew()}
+      />
+
+      <TagTreeDialog
+        open={tagTreeOpen}
+        onOpenChange={setTagTreeOpen}
+        onChanged={() => {
+          void fetchTagTree();
+          setSnippetListVersion(v => v + 1);
+        }}
+      />
+
+      {error ? <p className="text-sm text-destructive">{error}</p> : null}
+      {loading ? <p className="text-sm text-muted-foreground">Lade Snippets …</p> : null}
+
+      {!loading && snippets.length === 0 ? (
+        <p className="text-center text-sm text-muted-foreground">Keine Snippets. Mit „Neu“ starten.</p>
+      ) : null}
+
+      {snippets.length > 0 ? (
+        <>
+          <div className="flex flex-col gap-2 sm:gap-2.5 min-[1800px]:hidden">
+            {snippets.map(s => (
+              <SnippetCard
+                key={s.id}
+                snippet={s}
+                treeColorByName={treeColorByName}
+                treeDisplayByName={treeDisplayByName}
+                onReplace={replaceSnippet}
+                onRemove={removeSnippet}
+              />
+            ))}
+          </div>
+          <div className="hidden min-[1800px]:flex min-[1800px]:flex-row min-[1800px]:items-start min-[1800px]:gap-x-8">
+            <div className="flex min-w-0 flex-1 flex-col gap-4">
+              {snippetColumnLeft.map(s => (
+                <SnippetCard
+                  key={s.id}
+                  snippet={s}
+                  treeColorByName={treeColorByName}
+                  treeDisplayByName={treeDisplayByName}
+                  onReplace={replaceSnippet}
+                  onRemove={removeSnippet}
+                />
+              ))}
+            </div>
+            <div className="flex min-w-0 flex-1 flex-col gap-4">
+              {snippetColumnRight.map(s => (
+                <SnippetCard
+                  key={s.id}
+                  snippet={s}
+                  treeColorByName={treeColorByName}
+                  treeDisplayByName={treeDisplayByName}
+                  onReplace={replaceSnippet}
+                  onRemove={removeSnippet}
+                />
+              ))}
+            </div>
+          </div>
+        </>
+      ) : null}
+    </div>
+  );
+}

src/features/notes/NotesToolbar.tsx

@@ -0,0 +1,81 @@
+import { Tags } from "lucide-react";
+import { Button } from "@/components/ui/button";
+import { Input } from "@/components/ui/input";
+import { Label } from "@/components/ui/label";
+import { Select, SelectContent, SelectItem, SelectTrigger, SelectValue } from "@/components/ui/select";
+import { SORT_OPTIONS, type SortValue } from "@/features/notes/sortOptions";
+
+type Props = {
+  query: string;
+  onQueryChange: (v: string) => void;
+  sort: SortValue;
+  onSortChange: (v: SortValue) => void;
+  tagTreeCount: number;
+  onOpenTagTree: () => void;
+  onCreateNew: () => void;
+};
+
+export function NotesToolbar({
+  query,
+  onQueryChange,
+  sort,
+  onSortChange,
+  tagTreeCount,
+  onOpenTagTree,
+  onCreateNew,
+}: Props) {
+  return (
+    <header className="flex flex-col gap-3 sm:flex-row sm:flex-wrap sm:items-end sm:gap-3">
+      <div className="min-w-0 flex-1 space-y-1.5">
+        <Label htmlFor="search" className="text-xs text-muted-foreground">
+          Suche
+        </Label>
+        <Input
+          id="search"
+          value={query}
+          onChange={e => onQueryChange(e.target.value)}
+          placeholder="Freitext: Inhalt & Tags · tag:x · title:y · content:z"
+          autoComplete="off"
+          className="h-9"
+        />
+      </div>
+      <div className="w-full min-w-[min(100%,220px)] space-y-1.5 sm:w-72">
+        <Label htmlFor="sort" className="text-xs text-muted-foreground">
+          Sortierung
+        </Label>
+        <Select value={sort} onValueChange={v => onSortChange(v as SortValue)}>
+          <SelectTrigger id="sort" className="h-9 w-full">
+            <SelectValue placeholder="Sortierung" />
+          </SelectTrigger>
+          <SelectContent>
+            {SORT_OPTIONS.map(o => (
+              <SelectItem key={o.value} value={o.value}>
+                {o.label}
+              </SelectItem>
+            ))}
+          </SelectContent>
+        </Select>
+      </div>
+      <div className="flex flex-wrap gap-2 sm:shrink-0">
+        <Button
+          type="button"
+          variant="outline"
+          className="h-9 w-full gap-2 sm:w-auto"
+          onClick={onOpenTagTree}
+          title="Tag-Hierarchie und Anzeige-Prefixe verwalten"
+        >
+          <Tags className="size-4 shrink-0 opacity-70" aria-hidden />
+          <span>Tag-Baum</span>
+          {tagTreeCount > 0 ? (
+            <span className="rounded-full bg-muted px-1.5 py-0 text-[10px] font-medium tabular-nums text-muted-foreground">
+              {tagTreeCount}
+            </span>
+          ) : null}
+        </Button>
+        <Button type="button" className="h-9 w-full sm:w-auto" onClick={onCreateNew}>
+          Neu
+        </Button>
+      </div>
+    </header>
+  );
+}

src/features/notes/sortOptions.ts

@@ -0,0 +1,10 @@
+export const SORT_OPTIONS = [
+  { value: "updated_desc", label: "Zuletzt geändert (neu zuerst)" },
+  { value: "updated_asc", label: "Zuletzt geändert (alt zuerst)" },
+  { value: "deadline_asc", label: "Deadline (früheste zuerst)" },
+  { value: "deadline_desc", label: "Deadline (späteste zuerst)" },
+  { value: "title_asc", label: "Titel A–Z" },
+  { value: "title_desc", label: "Titel Z–A" },
+] as const;
+
+export type SortValue = (typeof SORT_OPTIONS)[number]["value"];

src/features/snippets/SnippetCard.tsx

@@ -0,0 +1,285 @@
+import { Pencil, Trash2 } from "lucide-react";
+import { useCallback, useEffect, useMemo, useState } from "react";
+import type { MouseEvent } from "react";
+import type { Snippet } from "@/types/snippet";
+import { deadlineToDateInput } from "@/lib/snippetDeadline";
+import { Button } from "@/components/ui/button";
+import { Card, CardContent, CardFooter } from "@/components/ui/card";
+import { SnippetDeadlineBadge } from "@/features/snippets/components/SnippetDeadlineBadge";
+import { SnippetEditDialog } from "@/features/snippets/components/SnippetEditDialog";
+import { TagPill } from "@/features/snippets/components/TagPill";
+import { colorForTagName, tagsFromString } from "@/features/snippets/lib/tagFieldUtils";
+import { formatWhen } from "@/features/snippets/lib/formatWhen";
+import { toggleMarkdownTaskAt } from "@/features/snippets/lib/markdownTasks";
+import { parseSnippetMarkdown } from "@/features/snippets/lib/parseSnippetMarkdown";
+
+type Props = {
+  snippet: Snippet;
+  treeColorByName: Record<string, string | null>;
+  treeDisplayByName: Record<string, string>;
+  onReplace: (s: Snippet) => void;
+  onRemove: (id: number) => void;
+};
+
+export function SnippetCard({ snippet, treeColorByName, treeDisplayByName, onReplace, onRemove }: Props) {
+  const pristineEmpty =
+    !snippet.body.trim() && (snippet.tags?.length ?? 0) === 0 && !snippet.deadline_at;
+
+  const [dialogOpen, setDialogOpen] = useState(pristineEmpty);
+  const [dirty, setDirty] = useState(false);
+  const [body, setBody] = useState(() => snippet.body ?? "");
+  const [tagsStr, setTagsStr] = useState(() => (snippet.tags ?? []).join(", "));
+  const [deadlineDate, setDeadlineDate] = useState(() => deadlineToDateInput(snippet.deadline_at));
+  const [busy, setBusy] = useState(false);
+  const [error, setError] = useState<string | null>(null);
+
+  const viewHtml = useMemo(() => parseSnippetMarkdown(snippet.body ?? ""), [snippet.body]);
+
+  useEffect(() => {
+    if (dialogOpen) return;
+    setBody(snippet.body ?? "");
+    setTagsStr((snippet.tags ?? []).join(", "));
+    setDeadlineDate(deadlineToDateInput(snippet.deadline_at));
+  }, [dialogOpen, snippet.id, snippet.updated_at, snippet.body, snippet.tags, snippet.deadline_at]);
+
+  const hydrateFromSnippet = () => {
+    setBody(snippet.body ?? "");
+    setTagsStr((snippet.tags ?? []).join(", "));
+    setDeadlineDate(deadlineToDateInput(snippet.deadline_at));
+    setDirty(false);
+    setError(null);
+  };
+
+  const openDialog = () => {
+    hydrateFromSnippet();
+    setDialogOpen(true);
+  };
+
+  const requestDismiss = () => {
+    setDialogOpen(false);
+    if (pristineEmpty && !dirty) void deleteRemote(false);
+  };
+
+  const handleOpenChange = (open: boolean) => {
+    if (open) openDialog();
+    else requestDismiss();
+  };
+
+  const save = async () => {
+    setBusy(true);
+    setError(null);
+    try {
+      const res = await fetch(`/api/snippets/${snippet.id}`, {
+        method: "PATCH",
+        headers: { "Content-Type": "application/json" },
+        body: JSON.stringify({
+          title: null,
+          body,
+          tags: tagsFromString(tagsStr),
+          deadline_at: deadlineDate.trim() === "" ? null : deadlineDate.trim(),
+        }),
+      });
+      if (!res.ok) {
+        const err = (await res.json().catch(() => null)) as { error?: string } | null;
+        throw new Error(err?.error ?? res.statusText);
+      }
+      const updated = (await res.json()) as Snippet;
+      onReplace(updated);
+      setDirty(false);
+      setDialogOpen(false);
+    } catch (e) {
+      setError(e instanceof Error ? e.message : "Speichern fehlgeschlagen");
+    } finally {
+      setBusy(false);
+    }
+  };
+
+  const handleMarkdownMouseDown = useCallback(
+    (e: MouseEvent<HTMLDivElement>) => {
+      const t = e.target;
+      if (!(t instanceof HTMLInputElement)) return;
+      if (!t.classList.contains("snippet-task-cb") || t.type !== "checkbox") return;
+      e.preventDefault();
+      e.stopPropagation();
+      const idx = Number(t.getAttribute("data-snippet-task-idx"));
+      if (!Number.isFinite(idx) || busy) return;
+      const newBody = toggleMarkdownTaskAt(snippet.body, idx);
+      if (newBody === null) return;
+      void (async () => {
+        setBusy(true);
+        setError(null);
+        try {
+          const res = await fetch(`/api/snippets/${snippet.id}`, {
+            method: "PATCH",
+            headers: { "Content-Type": "application/json" },
+            body: JSON.stringify({ title: null, body: newBody }),
+          });
+          if (!res.ok) {
+            const err = (await res.json().catch(() => null)) as { error?: string } | null;
+            throw new Error(err?.error ?? res.statusText);
+          }
+          onReplace((await res.json()) as Snippet);
+        } catch (err) {
+          setError(err instanceof Error ? err.message : "Aufgabe konnte nicht gespeichert werden");
+        } finally {
+          setBusy(false);
+        }
+      })();
+    },
+    [snippet.body, snippet.id, busy, onReplace],
+  );
+
+  async function clearDeadlineRemote() {
+    setBusy(true);
+    setError(null);
+    try {
+      const res = await fetch(`/api/snippets/${snippet.id}`, {
+        method: "PATCH",
+        headers: { "Content-Type": "application/json" },
+        body: JSON.stringify({ deadline_at: null }),
+      });
+      if (!res.ok) {
+        const err = (await res.json().catch(() => null)) as { error?: string } | null;
+        throw new Error(err?.error ?? res.statusText);
+      }
+      const updated = (await res.json()) as Snippet;
+      onReplace(updated);
+      setDeadlineDate("");
+    } catch (e) {
+      setError(e instanceof Error ? e.message : "Deadline konnte nicht entfernt werden");
+    } finally {
+      setBusy(false);
+    }
+  }
+
+  async function deleteRemote(askConfirm: boolean) {
+    if (askConfirm && !window.confirm("Snippet wirklich löschen?")) return;
+    setBusy(true);
+    setError(null);
+    try {
+      const res = await fetch(`/api/snippets/${snippet.id}`, { method: "DELETE" });
+      if (!res.ok && res.status !== 204) {
+        const err = (await res.json().catch(() => null)) as { error?: string } | null;
+        throw new Error(err?.error ?? res.statusText);
+      }
+      onRemove(snippet.id);
+    } catch (e) {
+      setError(e instanceof Error ? e.message : "Löschen fehlgeschlagen");
+    } finally {
+      setBusy(false);
+    }
+  }
+
+  const markDirty = () => setDirty(true);
+
+  return (
+    <>
+      <Card className="gap-0 border-border/80 py-0 text-left shadow-md ring-1 ring-black/5 dark:ring-white/10">
+        <CardContent className="space-y-1.5 px-3 pb-1 pt-2">
+          <div
+            role="button"
+            tabIndex={0}
+            title="Zum Bearbeiten klicken"
+            className="-mx-0.5 rounded-sm px-0.5 py-0.5 outline-none ring-offset-background focus-visible:ring-2 focus-visible:ring-ring"
+            onKeyDown={e => {
+              if (e.key === "Enter" || e.key === " ") {
+                e.preventDefault();
+                openDialog();
+              }
+            }}
+          >
+            <div className="snippet-md-card-wrap snippet-md-viewport overflow-hidden rounded-sm">
+              <div
+                className="snippet-md max-h-full overflow-x-auto overflow-y-auto pr-0.5"
+                dangerouslySetInnerHTML={{ __html: viewHtml }}
+                onMouseDown={handleMarkdownMouseDown}
+              />
+            </div>
+          </div>
+        </CardContent>
+        <CardFooter className="flex flex-row flex-wrap items-center gap-2 border-t border-border/80 px-3 py-1">
+          <div className="snippet-tag-cloud flex min-h-7 min-w-0 flex-1 flex-wrap items-center gap-1.5">
+            {snippet.tags.length ? (
+              snippet.tags.map((t, i) => (
+                <TagPill
+                  key={t}
+                  tagKey={t}
+                  label={snippet.tag_display?.[i] ?? treeDisplayByName[t] ?? t}
+                  hex={colorForTagName(t, treeColorByName, snippet.tag_colors ?? {})}
+                />
+              ))
+            ) : (
+              <span className="text-[10px] text-muted-foreground">Keine Tags</span>
+            )}
+          </div>
+          <div className="flex h-7 shrink-0 items-center gap-1.5">
+            {snippet.deadline_at ? (
+              <SnippetDeadlineBadge
+                deadlineAt={snippet.deadline_at}
+                busy={busy}
+                onMarkDone={() => void clearDeadlineRemote()}
+              />
+            ) : null}
+            <span className="whitespace-nowrap text-[10px] leading-none tabular-nums text-muted-foreground/90">
+              {formatWhen(snippet.updated_at)}
+            </span>
+            <Button
+              type="button"
+              variant="ghost"
+              size="icon-sm"
+              className="size-7 text-muted-foreground hover:text-foreground"
+              disabled={busy}
+              title="Bearbeiten"
+              onClick={openDialog}
+            >
+              <Pencil className="size-3.5" aria-hidden />
+              <span className="sr-only">Bearbeiten</span>
+            </Button>
+            <Button
+              type="button"
+              variant="ghost"
+              size="icon-sm"
+              className="size-7 text-muted-foreground hover:text-destructive"
+              disabled={busy}
+              title="Löschen"
+              onClick={() => void deleteRemote(true)}
+            >
+              <Trash2 className="size-3.5" aria-hidden />
+              <span className="sr-only">Löschen</span>
+            </Button>
+          </div>
+          {error && !dialogOpen ? (
+            <p className="basis-full truncate text-center text-[10px] text-destructive sm:text-start">{error}</p>
+          ) : null}
+        </CardFooter>
+      </Card>
+
+      <SnippetEditDialog
+        snippet={snippet}
+        open={dialogOpen}
+        onOpenChange={handleOpenChange}
+        treeColorByName={treeColorByName}
+        treeDisplayByName={treeDisplayByName}
+        body={body}
+        tagsStr={tagsStr}
+        onBodyChange={v => {
+          markDirty();
+          setBody(v);
+        }}
+        onTagsStrChange={v => {
+          markDirty();
+          setTagsStr(v);
+        }}
+        deadlineDate={deadlineDate}
+        onDeadlineChange={v => {
+          markDirty();
+          setDeadlineDate(v);
+        }}
+        busy={busy}
+        error={error}
+        onSave={() => void save()}
+        onDismiss={requestDismiss}
+      />
+    </>
+  );
+}

src/features/snippets/components/SnippetDeadlineBadge.tsx

@@ -0,0 +1,45 @@
+import { Check } from "lucide-react";
+import { cn } from "@/lib/utils";
+import { deadlineBadgeClass, deadlineTone, formatDeadlineLabel } from "@/lib/snippetDeadline";
+import { Button } from "@/components/ui/button";
+
+type Props = {
+  deadlineAt: string;
+  busy?: boolean;
+  onMarkDone?: () => void;
+};
+
+export function SnippetDeadlineBadge({ deadlineAt, busy, onMarkDone }: Props) {
+  const tone = deadlineTone(deadlineAt);
+  return (
+    <div className="contents">
+      <span
+        className={cn(
+          "text-[10px] font-medium tabular-nums",
+          deadlineBadgeClass(tone),
+        )}
+        title="Deadline"
+      >
+        {formatDeadlineLabel(deadlineAt)}
+      </span>
+      {onMarkDone ? (
+        <Button
+          type="button"
+          variant="ghost"
+          size="icon-sm"
+          className="size-7 text-muted-foreground hover:text-foreground"
+          disabled={busy}
+          title="Erledigt — Deadline entfernen"
+          onClick={e => {
+            e.stopPropagation();
+            
+            onMarkDone();
+          }}
+        >
+          <Check className="size-3.5" aria-hidden />
+          <span className="sr-only">Deadline entfernen</span>
+        </Button>
+      ) : null}
+    </div>
+  );
+}

src/features/snippets/components/SnippetEditDialog.tsx

@@ -0,0 +1,200 @@
+import { useCallback, useEffect, useMemo, useRef, useState } from "react";
+import type { MouseEvent } from "react";
+import type { Snippet } from "@/types/snippet";
+import { Button } from "@/components/ui/button";
+import { Dialog, DialogContent, DialogDescription, DialogFooter, DialogHeader, DialogTitle } from "@/components/ui/dialog";
+import { DateInput } from "@/components/ui/date-input";
+import { Input } from "@/components/ui/input";
+import { Label } from "@/components/ui/label";
+import { Textarea } from "@/components/ui/textarea";
+import { useTagSuggestions } from "@/features/snippets/hooks/useTagSuggestions";
+import { TagPill } from "@/features/snippets/components/TagPill";
+import { TagSuggestDropdown } from "@/features/snippets/components/TagSuggestDropdown";
+import { colorForTagName, splitTagsField, tagsFromString } from "@/features/snippets/lib/tagFieldUtils";
+import { toggleMarkdownTaskAt } from "@/features/snippets/lib/markdownTasks";
+import { parseSnippetMarkdown } from "@/features/snippets/lib/parseSnippetMarkdown";
+
+type Props = {
+  snippet: Snippet;
+  open: boolean;
+  onOpenChange: (open: boolean) => void;
+  treeColorByName: Record<string, string | null>;
+  treeDisplayByName: Record<string, string>;
+  body: string;
+  tagsStr: string;
+  onBodyChange: (v: string) => void;
+  onTagsStrChange: (v: string) => void;
+  deadlineDate: string;
+  onDeadlineChange: (v: string) => void;
+  busy: boolean;
+  error: string | null;
+  onSave: () => void;
+  onDismiss: () => void;
+};
+
+export function SnippetEditDialog({
+  snippet,
+  open,
+  onOpenChange,
+  treeColorByName,
+  treeDisplayByName,
+  body,
+  tagsStr,
+  onBodyChange,
+  onTagsStrChange,
+  deadlineDate,
+  onDeadlineChange,
+  busy,
+  error,
+  onSave,
+  onDismiss,
+}: Props) {
+  const bodyRef = useRef<HTMLTextAreaElement>(null);
+  const [showPreview, setShowPreview] = useState(false);
+  const [tagFieldFocused, setTagFieldFocused] = useState(false);
+  const { items: tagSuggest, open: tagSuggestOpen, setOpen: setTagSuggestOpen, activeIndex, setActiveIndex } =
+    useTagSuggestions(open, tagFieldFocused, tagsStr);
+
+  const previewHtml = useMemo(() => parseSnippetMarkdown(body), [body]);
+
+  const handlePreviewMouseDown = useCallback(
+    (e: MouseEvent<HTMLDivElement>) => {
+      const t = e.target;
+      if (!(t instanceof HTMLInputElement)) return;
+      if (!t.classList.contains("snippet-task-cb") || t.type !== "checkbox") return;
+      e.preventDefault();
+      e.stopPropagation();
+      const idx = Number(t.getAttribute("data-snippet-task-idx"));
+      if (!Number.isFinite(idx) || busy) return;
+      const next = toggleMarkdownTaskAt(body, idx);
+      if (next !== null) onBodyChange(next);
+    },
+    [body, busy, onBodyChange],
+  );
+
+  useEffect(() => {
+    if (!open) setShowPreview(false);
+  }, [open]);
+
+  const applyTagSuggestion = (label: string) => {
+    const { committed } = splitTagsField(tagsStr);
+    onTagsStrChange(`${committed}${label}, `);
+    setTagSuggestOpen(false);
+  };
+
+  return (
+    <Dialog open={open} onOpenChange={onOpenChange}>
+      <DialogContent
+        variant="fullscreen"
+        onOpenAutoFocus={e => {
+          e.preventDefault();
+          requestAnimationFrame(() => bodyRef.current?.focus());
+        }}
+      >
+        <DialogHeader className="dialog-snippet-header">
+          <DialogTitle className="text-base">Snippet bearbeiten</DialogTitle>
+          <DialogDescription className="text-xs">Tags und Markdown — Vorschau optional.</DialogDescription>
+        </DialogHeader>
+
+        <div className="dialog-snippet-body">
+          <div className="relative shrink-0">
+            <Input
+              value={tagsStr}
+              onChange={e => onTagsStrChange(e.target.value)}
+              onFocus={() => setTagFieldFocused(true)}
+              onBlur={() => {
+                window.setTimeout(() => setTagFieldFocused(false), 140);
+                window.setTimeout(() => setTagSuggestOpen(false), 160);
+              }}
+              onKeyDown={e => {
+                if (!tagSuggestOpen || tagSuggest.length === 0) return;
+                if (e.key === "ArrowDown") {
+                  e.preventDefault();
+                  setActiveIndex(i => Math.min(tagSuggest.length - 1, i + 1));
+                } else if (e.key === "ArrowUp") {
+                  e.preventDefault();
+                  setActiveIndex(i => Math.max(0, i - 1));
+                } else if (e.key === "Enter") {
+                  e.preventDefault();
+                  const pick = tagSuggest[activeIndex];
+                  if (pick) applyTagSuggestion(pick.name);
+                } else if (e.key === "Escape") {
+                  e.preventDefault();
+                  setTagSuggestOpen(false);
+                }
+              }}
+              placeholder="Tags, kommagetrennt — Vorschläge mit Pfeiltasten / Enter"
+              autoComplete="off"
+              className="h-9"
+            />
+            <TagSuggestDropdown
+              open={tagSuggestOpen}
+              items={tagSuggest}
+              activeIndex={activeIndex}
+              onPick={name => applyTagSuggestion(name)}
+            />
+          </div>
+          <div className="snippet-tag-cloud flex min-h-[1.5rem] flex-wrap gap-1.5">
+            {tagsFromString(tagsStr).map((t, i) => (
+              <TagPill
+                key={`${i}-${t}`}
+                tagKey={t}
+                label={treeDisplayByName[t] ?? t}
+                hex={colorForTagName(t, treeColorByName, snippet.tag_colors ?? {})}
+              />
+            ))}
+          </div>
+          <div className={showPreview ? "dialog-snippet-editor-with-preview" : "dialog-snippet-editor"}>
+            <Textarea
+              ref={bodyRef}
+              value={body}
+              onChange={e => onBodyChange(e.target.value)}
+              className="dialog-snippet-textarea"
+              placeholder="Markdown …"
+            />
+            {showPreview ? (
+              <div
+                className="dialog-snippet-preview snippet-md"
+                dangerouslySetInnerHTML={{ __html: previewHtml }}
+                onMouseDown={handlePreviewMouseDown}
+              />
+            ) : null}
+          </div>
+          <div className="flex shrink-0 flex-wrap items-end gap-2">
+            <div className="min-w-[11rem] flex-1 space-y-1">
+              <Label htmlFor="snippet-deadline" className="text-xs text-muted-foreground">
+                Deadline (optional)
+              </Label>
+              <DateInput id="snippet-deadline" value={deadlineDate} onChange={e => onDeadlineChange(e.target.value)} />
+            </div>
+            <Button
+              type="button"
+              variant="outline"
+              size="sm"
+              className="h-9 shrink-0"
+              disabled={!deadlineDate}
+              onClick={() => onDeadlineChange("")}
+            >
+              Deadline entfernen
+            </Button>
+          </div>
+          {error ? <p className="shrink-0 text-sm text-destructive">{error}</p> : null}
+        </div>
+
+        <DialogFooter className="dialog-snippet-footer">
+          <Button type="button" variant="outline" size="sm" className="h-8 text-xs" onClick={() => setShowPreview(v => !v)}>
+            {showPreview ? "Vorschau aus" : "Vorschau"}
+          </Button>
+          <div className="flex flex-wrap items-center justify-end gap-2">
+            <Button type="button" variant="secondary" size="sm" className="h-8" disabled={busy} onClick={onDismiss}>
+              Abbrechen
+            </Button>
+            <Button type="button" size="sm" className="h-8" disabled={busy} onClick={onSave}>
+              Speichern
+            </Button>
+          </div>
+        </DialogFooter>
+      </DialogContent>
+    </Dialog>
+  );
+}

src/features/snippets/components/TagPill.tsx

@@ -0,0 +1,45 @@
+import { Hash } from "lucide-react";
+import type { CSSProperties } from "react";
+import { cn } from "@/lib/utils";
+
+type Props = {
+  tagKey: string;
+  label: string;
+  hex: string | null;
+};
+
+export function TagPill({ tagKey, label, hex }: Props) {
+  const has = Boolean(hex && /^#[0-9A-Fa-f]{6}$/i.test(hex));
+  return (
+    <span
+      className={cn(
+        "tag-pill inline-flex max-w-full items-center gap-1 rounded-lg border px-2 py-0.5 text-[11px] font-medium leading-tight shadow-sm ring-1 ring-black/[0.04] transition-[box-shadow,transform,background-color] duration-150 dark:ring-white/[0.06]",
+        has
+          ? "shadow-[0_1px_2px_rgba(0,0,0,0.06)] dark:shadow-[0_1px_2px_rgba(0,0,0,0.35)]"
+          : "border-border/70 bg-gradient-to-b from-muted/90 to-muted/45 text-muted-foreground dark:from-muted/50 dark:to-muted/25",
+      )}
+      style={
+        has
+          ? ({
+              borderColor: `${hex}cc`,
+              background: `linear-gradient(165deg, color-mix(in oklch, ${hex} 28%, transparent) 0%, color-mix(in oklch, ${hex} 12%, transparent) 100%)`,
+              boxShadow: `0 1px 2px color-mix(in oklch, ${hex} 35%, transparent), inset 0 1px 0 color-mix(in oklch, white 22%, transparent)`,
+              color: `color-mix(in oklch, ${hex} 12%, var(--foreground))`,
+            } as CSSProperties)
+          : undefined
+      }
+      title={tagKey === label ? tagKey : `${label} (${tagKey})`}
+    >
+      {has ? (
+        <span
+          className="size-1.5 shrink-0 rounded-full ring-1 ring-black/10 dark:ring-white/15"
+          style={{ backgroundColor: hex! }}
+          aria-hidden
+        />
+      ) : (
+        <Hash className="size-2.5 shrink-0 opacity-55" aria-hidden />
+      )}
+      <span className="min-w-0 truncate">{label}</span>
+    </span>
+  );
+}

src/features/snippets/components/TagSuggestDropdown.tsx

@@ -0,0 +1,32 @@
+import { cn } from "@/lib/utils";
+import type { TagSuggestionItem } from "@/features/snippets/hooks/useTagSuggestions";
+
+type Props = {
+  open: boolean;
+  items: TagSuggestionItem[];
+  activeIndex: number;
+  onPick: (name: string) => void;
+};
+
+export function TagSuggestDropdown({ open, items, activeIndex, onPick }: Props) {
+  if (!open) return null;
+  return (
+    <ul role="listbox" className="tag-suggest-dropdown">
+      {items.map((item, i) => (
+        <li key={`${item.name}-${i}`} role="option" aria-selected={i === activeIndex}>
+          <button
+            type="button"
+            className={cn("tag-suggest-option", i === activeIndex && "tag-suggest-option-active")}
+            onMouseDown={e => e.preventDefault()}
+            onClick={() => onPick(item.name)}
+          >
+            <span className="text-xs">{item.display}</span>
+            {item.display !== item.name ? (
+              <span className="font-mono text-[10px] text-muted-foreground">{item.name}</span>
+            ) : null}
+          </button>
+        </li>
+      ))}
+    </ul>
+  );
+}

src/features/snippets/hooks/useTagSuggestions.ts

@@ -0,0 +1,48 @@
+import { useEffect, useRef, useState } from "react";
+import { splitTagsField } from "@/features/snippets/lib/tagFieldUtils";
+
+export type TagSuggestionItem = { name: string; display: string };
+
+export function useTagSuggestions(dialogOpen: boolean, tagFieldFocused: boolean, tagsStr: string) {
+  const [items, setItems] = useState<TagSuggestionItem[]>([]);
+  const [open, setOpen] = useState(false);
+  const [activeIndex, setActiveIndex] = useState(0);
+  const reqId = useRef(0);
+
+  useEffect(() => {
+    if (!dialogOpen || !tagFieldFocused) {
+      setOpen(false);
+      return;
+    }
+    const { token } = splitTagsField(tagsStr);
+    const id = ++reqId.current;
+    const t = window.setTimeout(() => {
+      void (async () => {
+        try {
+          const res = await fetch(`/api/tag-suggestions?q=${encodeURIComponent(token)}`);
+          if (reqId.current !== id) return;
+          if (!res.ok) return;
+          const data = (await res.json()) as { items?: TagSuggestionItem[] };
+          const next = Array.isArray(data.items) ? data.items : [];
+          setItems(next);
+          setOpen(next.length > 0);
+          setActiveIndex(0);
+        } catch {
+          if (reqId.current !== id) return;
+          setItems([]);
+          setOpen(false);
+        }
+      })();
+    }, 160);
+    return () => window.clearTimeout(t);
+  }, [dialogOpen, tagFieldFocused, tagsStr]);
+
+  useEffect(() => {
+    if (!dialogOpen) {
+      setItems([]);
+      setOpen(false);
+    }
+  }, [dialogOpen]);
+
+  return { items, open, setOpen, activeIndex, setActiveIndex };
+}

src/features/snippets/lib/formatWhen.ts

@@ -0,0 +1,7 @@
+export function formatWhen(iso: string): string {
+  try {
+    return new Date(iso).toLocaleString(undefined, { dateStyle: "short", timeStyle: "short" });
+  } catch {
+    return iso;
+  }
+}

src/features/snippets/lib/markdownTasks.ts

@@ -0,0 +1,31 @@
+/**
+ * GFM-Tasklisten (`- [ ]` / `- [x]`) in Dokumentreihenfolge erkennen und umschalten.
+ */
+
+/** GFM task lines: `- [ ]`, `* [x]`, `1. [ ]`; optional indent; text after `]` optional. */
+const TASK_LINE =
+  /^(\s*)([-*+]|\d+\.)\s+\[([ xX])\]\s*(.*)$/;
+
+export function listMarkdownTaskLineIndices(body: string): number[] {
+  const lines = body.split(/\r?\n/);
+  const out: number[] = [];
+  for (let i = 0; i < lines.length; i++) {
+    if (TASK_LINE.test(lines[i]!)) out.push(i);
+  }
+  return out;
+}
+
+/** Kippt die n-te Task-Zeile im Dokument (`[ ]` ↔ `[x]`). `null` bei ungültigem Index. */
+export function toggleMarkdownTaskAt(body: string, taskIndex: number): string | null {
+  const lines = body.split(/\r?\n/);
+  const taskLineIndices = listMarkdownTaskLineIndices(body);
+  if (taskIndex < 0 || taskIndex >= taskLineIndices.length) return null;
+  const li = taskLineIndices[taskIndex]!;
+  const line = lines[li]!;
+  const m = line.match(TASK_LINE);
+  if (!m) return null;
+  const checked = m[3] === "x" || m[3] === "X";
+  const next = checked ? " " : "x";
+  lines[li] = line.replace(/\[[ xX]\]/, `[${next}]`);
+  return lines.join("\n");
+}

src/features/snippets/lib/parseSnippetMarkdown.ts

@@ -0,0 +1,78 @@
+import hljs from "highlight.js/lib/common";
+import { marked } from "marked";
+
+marked.setOptions({ gfm: true, pedantic: false });
+
+/** Pro `parseSnippetMarkdown`-Aufruf: Checkbox-Indizes von 0 … */
+const taskCheckboxSeq = { n: 0 };
+
+/** Markdown-Sprachkennungen → highlight.js-Name */
+const LANG_ALIASES: Record<string, string> = {
+  ts: "typescript",
+  tsx: "typescript",
+  js: "javascript",
+  mjs: "javascript",
+  cjs: "javascript",
+  sh: "bash",
+  zsh: "bash",
+  yml: "yaml",
+  md: "markdown",
+  rs: "rust",
+  py: "python",
+  rb: "ruby",
+  kt: "kotlin",
+  kts: "kotlin",
+  text: "plaintext",
+  txt: "plaintext",
+};
+
+function resolveLang(raw: string | undefined): string {
+  const t = (raw ?? "").trim().toLowerCase();
+  if (!t) return "plaintext";
+  return LANG_ALIASES[t] ?? t;
+}
+
+function langClassSegment(lang: string): string {
+  return lang.replace(/[^a-z0-9_-]/gi, "-") || "plaintext";
+}
+
+function escapeHtml(s: string): string {
+  return s
+    .replace(/&/g, "&amp;")
+    .replace(/</g, "&lt;")
+    .replace(/>/g, "&gt;")
+    .replace(/"/g, "&quot;");
+}
+
+let markedExtensionsConfigured = false;
+
+function ensureMarkedExtensions(): void {
+  if (markedExtensionsConfigured) return;
+  markedExtensionsConfigured = true;
+  marked.use({
+    renderer: {
+      code({ text, lang }) {
+        const key = resolveLang(lang);
+        const use = hljs.getLanguage(key) ? key : "plaintext";
+        try {
+          const highlighted = hljs.highlight(text, { language: use, ignoreIllegals: true }).value;
+          return `<pre class="snippet-pre"><code class="hljs language-${langClassSegment(use)}">${highlighted}</code></pre>\n`;
+        } catch {
+          return `<pre class="snippet-pre"><code class="hljs language-plaintext">${escapeHtml(text)}</code></pre>\n`;
+        }
+      },
+      checkbox({ checked }) {
+        const idx = taskCheckboxSeq.n++;
+        const chk = checked ? " checked" : "";
+        return `<input type="checkbox" class="snippet-task-cb"${chk} data-snippet-task-idx="${idx}" aria-label="Aufgabe umschalten" /> `;
+      },
+    },
+  });
+}
+
+ensureMarkedExtensions();
+
+export function parseSnippetMarkdown(md: string): string {
+  taskCheckboxSeq.n = 0;
+  return marked.parse(md) as string;
+}

src/features/snippets/lib/tagFieldUtils.ts

@@ -0,0 +1,23 @@
+export function tagsFromString(s: string): string[] {
+  return s
+    .split(",")
+    .map(t => t.trim())
+    .filter(Boolean);
+}
+
+/** Letztes Segment nach dem letzten Komma (laufender Tag-Token). */
+export function splitTagsField(s: string): { committed: string; token: string } {
+  const lastComma = s.lastIndexOf(",");
+  if (lastComma === -1) {
+    return { committed: "", token: s.trimStart() };
+  }
+  return { committed: s.slice(0, lastComma + 1), token: s.slice(lastComma + 1).trimStart() };
+}
+
+export function colorForTagName(
+  name: string,
+  treeColorByName: Record<string, string | null>,
+  snippetColors: Record<string, string | null>,
+): string | null {
+  return treeColorByName[name] ?? snippetColors[name] ?? null;
+}

src/features/tag-tree/TagTreeDialog.tsx

@@ -0,0 +1,202 @@
+import { useCallback, useEffect, useMemo, useState, type MouseEvent } from "react";
+import { Dialog, DialogContent } from "@/components/ui/dialog";
+import { cn } from "@/lib/utils";
+import type { TagTreeNode } from "@/types/tagTree";
+import { orderedWithDepth } from "@/features/tag-tree/orderTagTree";
+import { TagTreeDialogFooter } from "@/features/tag-tree/TagTreeDialogFooter";
+import { TagTreeDialogHeader } from "@/features/tag-tree/TagTreeDialogHeader";
+import { TagTreeHierarchyPanel } from "@/features/tag-tree/TagTreeHierarchyPanel";
+import { TagTreeNodeForm } from "@/features/tag-tree/TagTreeNodeForm";
+import { useTagTreeParentOptions } from "@/features/tag-tree/useTagTreeParentOptions";
+
+type Props = {
+  open: boolean;
+  onOpenChange: (open: boolean) => void;
+  onChanged?: () => void;
+};
+
+export function TagTreeDialog({ open, onOpenChange, onChanged }: Props) {
+  const [nodes, setNodes] = useState<TagTreeNode[]>([]);
+  const [loading, setLoading] = useState(false);
+  const [error, setError] = useState<string | null>(null);
+  const [formOpen, setFormOpen] = useState(false);
+  const [editingId, setEditingId] = useState<number | null>(null);
+  const [name, setName] = useState("");
+  const [parentIdStr, setParentIdStr] = useState<string>("__root__");
+  const [color, setColor] = useState("");
+  const [labelPrefix, setLabelPrefix] = useState("");
+  const [busy, setBusy] = useState(false);
+
+  const load = useCallback(async () => {
+    setLoading(true);
+    setError(null);
+    try {
+      const res = await fetch("/api/tag-tree");
+      if (!res.ok) throw new Error(await res.text());
+      setNodes((await res.json()) as TagTreeNode[]);
+    } catch (e) {
+      setError(e instanceof Error ? e.message : "Laden fehlgeschlagen");
+    } finally {
+      setLoading(false);
+    }
+  }, []);
+
+  useEffect(() => {
+    if (!open) return;
+    void load();
+  }, [open, load]);
+
+  useEffect(() => {
+    if (!open) {
+      setFormOpen(false);
+      setEditingId(null);
+      setName("");
+      setParentIdStr("__root__");
+      setColor("");
+      setLabelPrefix("");
+      setError(null);
+    }
+  }, [open]);
+
+  const flatOrdered = useMemo(() => orderedWithDepth(nodes), [nodes]);
+  const parentOptions = useTagTreeParentOptions(nodes, editingId);
+
+  const resetFormFields = () => {
+    setEditingId(null);
+    setName("");
+    setParentIdStr("__root__");
+    setColor("");
+    setLabelPrefix("");
+  };
+
+  const exitFormMode = () => {
+    setFormOpen(false);
+    resetFormFields();
+    setError(null);
+  };
+
+  const startEdit = (n: TagTreeNode) => {
+    setFormOpen(true);
+    setEditingId(n.id);
+    setName(n.name);
+    setParentIdStr(n.parent_id == null ? "__root__" : String(n.parent_id));
+    setColor(n.color ?? "");
+    setLabelPrefix(n.label_prefix ?? "");
+    setError(null);
+  };
+
+  const startNewUnder = (parentId: number | null) => {
+    setFormOpen(true);
+    resetFormFields();
+    setParentIdStr(parentId == null ? "__root__" : String(parentId));
+    setError(null);
+  };
+
+  const save = async () => {
+    setBusy(true);
+    setError(null);
+    try {
+      const parent_id = parentIdStr === "__root__" ? null : Number(parentIdStr);
+      const colorNorm = color.trim() === "" ? null : color.trim();
+      const labelPrefixNorm = labelPrefix.trim() === "" ? null : labelPrefix.trim();
+      if (editingId == null) {
+        const res = await fetch("/api/tag-tree", {
+          method: "POST",
+          headers: { "Content-Type": "application/json" },
+          body: JSON.stringify({ name, parent_id, color: colorNorm, label_prefix: labelPrefixNorm }),
+        });
+        if (!res.ok) {
+          const err = (await res.json().catch(() => null)) as { error?: string } | null;
+          throw new Error(err?.error ?? res.statusText);
+        }
+      } else {
+        const res = await fetch(`/api/tag-tree/${editingId}`, {
+          method: "PATCH",
+          headers: { "Content-Type": "application/json" },
+          body: JSON.stringify({ name, parent_id, color: colorNorm, label_prefix: labelPrefixNorm }),
+        });
+        if (!res.ok) {
+          const err = (await res.json().catch(() => null)) as { error?: string } | null;
+          throw new Error(err?.error ?? res.statusText);
+        }
+      }
+      await load();
+      exitFormMode();
+      onChanged?.();
+    } catch (e) {
+      setError(e instanceof Error ? e.message : "Speichern fehlgeschlagen");
+    } finally {
+      setBusy(false);
+    }
+  };
+
+  const remove = async (id: number, e?: MouseEvent) => {
+    e?.stopPropagation();
+    if (!window.confirm("Diesen Knoten und alle Unterknoten wirklich löschen?")) return;
+    setBusy(true);
+    setError(null);
+    try {
+      const res = await fetch(`/api/tag-tree/${id}`, { method: "DELETE" });
+      if (!res.ok && res.status !== 204) {
+        const err = (await res.json().catch(() => null)) as { error?: string } | null;
+        throw new Error(err?.error ?? res.statusText);
+      }
+      if (editingId === id) exitFormMode();
+      await load();
+      onChanged?.();
+    } catch (e) {
+      setError(e instanceof Error ? e.message : "Löschen fehlgeschlagen");
+    } finally {
+      setBusy(false);
+    }
+  };
+
+  return (
+    <Dialog open={open} onOpenChange={onOpenChange}>
+      <DialogContent variant="fullscreen">
+        <TagTreeDialogHeader />
+
+        <div className={cn("tag-tree-main", !formOpen && "lg:flex-1")}>
+          <TagTreeHierarchyPanel
+            formOpen={formOpen}
+            loading={loading}
+            busy={busy}
+            error={error}
+            nodes={nodes}
+            flatOrdered={flatOrdered}
+            editingId={editingId}
+            onNewRoot={() => startNewUnder(null)}
+            onEdit={startEdit}
+            onAddChild={parentId => startNewUnder(parentId)}
+            onDelete={(id, ev) => void remove(id, ev)}
+          />
+
+          {formOpen ? (
+            <TagTreeNodeForm
+              editingId={editingId}
+              name={name}
+              onNameChange={setName}
+              labelPrefix={labelPrefix}
+              onLabelPrefixChange={setLabelPrefix}
+              parentIdStr={parentIdStr}
+              onParentIdStrChange={setParentIdStr}
+              color={color}
+              onColorChange={setColor}
+              parentOptions={parentOptions}
+              error={error}
+            />
+          ) : null}
+        </div>
+
+        <TagTreeDialogFooter
+          formOpen={formOpen}
+          busy={busy}
+          canSave={Boolean(name.trim())}
+          onExitForm={exitFormMode}
+          onSave={() => void save()}
+          onCloseDialog={() => onOpenChange(false)}
+        />
+      </DialogContent>
+    </Dialog>
+  );
+}

src/features/tag-tree/TagTreeDialogFooter.tsx

@@ -0,0 +1,32 @@
+import { Button } from "@/components/ui/button";
+import { DialogFooter } from "@/components/ui/dialog";
+
+type Props = {
+  formOpen: boolean;
+  busy: boolean;
+  canSave: boolean;
+  onExitForm: () => void;
+  onSave: () => void;
+  onCloseDialog: () => void;
+};
+
+export function TagTreeDialogFooter({ formOpen, busy, canSave, onExitForm, onSave, onCloseDialog }: Props) {
+  return (
+    <DialogFooter className="tag-tree-dialog-footer">
+      {formOpen ? (
+        <>
+          <Button type="button" variant="outline" className="h-9" disabled={busy} onClick={onExitForm}>
+            Schließen
+          </Button>
+          <Button type="button" className="h-9" disabled={busy || !canSave} onClick={onSave}>
+            Speichern
+          </Button>
+        </>
+      ) : (
+        <Button type="button" variant="outline" className="h-9" disabled={busy} onClick={onCloseDialog}>
+          Schließen
+        </Button>
+      )}
+    </DialogFooter>
+  );
+}

src/features/tag-tree/TagTreeDialogHeader.tsx

@@ -0,0 +1,21 @@
+import { FolderTree } from "lucide-react";
+import { DialogDescription, DialogHeader, DialogTitle } from "@/components/ui/dialog";
+
+export function TagTreeDialogHeader() {
+  return (
+    <DialogHeader className="tag-tree-dialog-header">
+      <div className="tag-tree-dialog-hero">
+        <div className="tag-tree-dialog-icon">
+          <FolderTree className="size-4 text-muted-foreground" aria-hidden />
+        </div>
+        <div className="tag-tree-dialog-hero-text">
+          <DialogTitle className="text-lg">Tag-Baum</DialogTitle>
+          <DialogDescription className="text-pretty text-xs leading-relaxed sm:text-sm">
+            Strukturierte Tags für Suche und Farben.{" "}
+            <span className="text-foreground/90">Kurzname</span> in Snippets; optionaler Prefix nur für die Anzeige.
+          </DialogDescription>
+        </div>
+      </div>
+    </DialogHeader>
+  );
+}

src/features/tag-tree/TagTreeHierarchyPanel.tsx

@@ -0,0 +1,93 @@
+import { Loader2, Plus } from "lucide-react";
+import type { MouseEvent } from "react";
+import { cn } from "@/lib/utils";
+import type { TagTreeNode } from "@/types/tagTree";
+import { Button } from "@/components/ui/button";
+import { TagTreeNodeRow } from "@/features/tag-tree/TagTreeNodeRow";
+
+type FlatRow = { node: TagTreeNode; depth: number };
+
+type Props = {
+  formOpen: boolean;
+  loading: boolean;
+  busy: boolean;
+  error: string | null;
+  nodes: TagTreeNode[];
+  flatOrdered: FlatRow[];
+  editingId: number | null;
+  onNewRoot: () => void;
+  onEdit: (n: TagTreeNode) => void;
+  onAddChild: (parentId: number) => void;
+  onDelete: (id: number, e?: MouseEvent) => void;
+};
+
+export function TagTreeHierarchyPanel({
+  formOpen,
+  loading,
+  busy,
+  error,
+  nodes,
+  flatOrdered,
+  editingId,
+  onNewRoot,
+  onEdit,
+  onAddChild,
+  onDelete,
+}: Props) {
+  return (
+    <div className={cn("tag-tree-hierarchy", formOpen ? "tag-tree-hierarchy--with-form" : "tag-tree-hierarchy--solo")}>
+      {!formOpen && error ? <div className="tag-tree-inline-error">{error}</div> : null}
+      <div className="tag-tree-toolbar">
+        <div className="flex items-center gap-2">
+          <span className="text-xs font-medium uppercase tracking-wide text-muted-foreground">Hierarchie</span>
+          {!loading ? <span className="tag-tree-count-chip">{nodes.length}</span> : null}
+        </div>
+        <Button
+          type="button"
+          variant="secondary"
+          size="sm"
+          className="h-8 gap-1.5 px-2.5 text-xs"
+          disabled={busy}
+          onClick={onNewRoot}
+        >
+          <Plus className="size-3.5" aria-hidden />
+          Neuer Knoten
+        </Button>
+      </div>
+
+      <div className="tag-tree-scroll">
+        {loading ? (
+          <div className="tag-tree-loading">
+            <Loader2 className="size-7 animate-spin opacity-70" aria-hidden />
+            <span className="text-sm">Lade Tag-Baum …</span>
+          </div>
+        ) : flatOrdered.length === 0 ? (
+          <div className="tag-tree-empty">
+            <p className="max-w-xs text-sm text-muted-foreground">
+              Noch keine Knoten. Lege den ersten an — er erscheint in der Vorschau und in der Tag-Suche.
+            </p>
+            <Button type="button" size="sm" className="gap-1.5" onClick={onNewRoot}>
+              <Plus className="size-3.5" aria-hidden />
+              Ersten Knoten anlegen
+            </Button>
+          </div>
+        ) : (
+          <ul className="tag-tree-node-list" role="list">
+            {flatOrdered.map(({ node: n, depth }) => (
+              <TagTreeNodeRow
+                key={n.id}
+                node={n}
+                depth={depth}
+                isActive={formOpen && editingId === n.id}
+                busy={busy}
+                onEdit={onEdit}
+                onAddChild={onAddChild}
+                onDelete={onDelete}
+              />
+            ))}
+          </ul>
+        )}
+      </div>
+    </div>
+  );
+}

src/features/tag-tree/TagTreeNodeForm.tsx

@@ -0,0 +1,128 @@
+import { formatTreeTagDisplay } from "@/lib/treeTagDisplay";
+import type { TagTreeNode } from "@/types/tagTree";
+import { Input } from "@/components/ui/input";
+import { Label } from "@/components/ui/label";
+import { Select, SelectContent, SelectItem, SelectTrigger, SelectValue } from "@/components/ui/select";
+
+type Props = {
+  editingId: number | null;
+  name: string;
+  onNameChange: (v: string) => void;
+  labelPrefix: string;
+  onLabelPrefixChange: (v: string) => void;
+  parentIdStr: string;
+  onParentIdStrChange: (v: string) => void;
+  color: string;
+  onColorChange: (v: string) => void;
+  parentOptions: TagTreeNode[];
+  error: string | null;
+};
+
+export function TagTreeNodeForm({
+  editingId,
+  name,
+  onNameChange,
+  labelPrefix,
+  onLabelPrefixChange,
+  parentIdStr,
+  onParentIdStrChange,
+  color,
+  onColorChange,
+  parentOptions,
+  error,
+}: Props) {
+  const previewLabel = name.trim() ? formatTreeTagDisplay(name.trim(), labelPrefix) : null;
+
+  return (
+    <div className="flex w-full min-w-0 flex-1 flex-col overflow-y-auto bg-background lg:max-w-md">
+      <div className="border-b px-4 py-2.5 sm:px-5">
+        <p className="text-xs font-medium uppercase tracking-wide text-muted-foreground">
+          {editingId == null ? "Knoten anlegen" : "Knoten bearbeiten"}
+        </p>
+        {editingId != null ? <p className="mt-0.5 font-mono text-[11px] text-muted-foreground">ID {editingId}</p> : null}
+      </div>
+
+      <div className="flex flex-1 flex-col gap-5 px-4 py-4 sm:px-5">
+        {error ? (
+          <p className="rounded-md border border-destructive/40 bg-destructive/10 px-3 py-2 text-sm text-destructive">
+            {error}
+          </p>
+        ) : null}
+
+        <div className="space-y-4">
+          <div className="space-y-2">
+            <Label htmlFor="tt-name" className="text-xs text-muted-foreground">
+              Kurzname (Snippet, Suche, Intellisense)
+            </Label>
+            <Input
+              id="tt-name"
+              value={name}
+              onChange={e => onNameChange(e.target.value)}
+              className="font-mono text-sm"
+              autoComplete="off"
+              placeholder="sp-migrator"
+            />
+          </div>
+
+          <div className="space-y-2">
+            <Label htmlFor="tt-prefix" className="text-xs text-muted-foreground">
+              Anzeige-Prefix (optional)
+            </Label>
+            <Input
+              id="tt-prefix"
+              value={labelPrefix}
+              onChange={e => onLabelPrefixChange(e.target.value)}
+              placeholder="Projekt:"
+              className="font-mono text-sm"
+              autoComplete="off"
+            />
+            <div className="rounded-md border bg-muted/30 px-3 py-2 text-xs">
+              <span className="text-muted-foreground">Vorschau </span>
+              <span className="font-medium text-foreground">{previewLabel ?? "—"}</span>
+            </div>
+          </div>
+
+          <div className="space-y-2">
+            <Label className="text-xs text-muted-foreground">Übergeordnet</Label>
+            <Select value={parentIdStr} onValueChange={onParentIdStrChange}>
+              <SelectTrigger className="h-9 w-full font-mono text-xs">
+                <SelectValue placeholder="Wurzel" />
+              </SelectTrigger>
+              <SelectContent>
+                <SelectItem value="__root__">(Wurzel — kein Parent)</SelectItem>
+                {parentOptions.map(n => (
+                  <SelectItem key={n.id} value={String(n.id)}>
+                    {formatTreeTagDisplay(n.name, n.label_prefix)}
+                  </SelectItem>
+                ))}
+              </SelectContent>
+            </Select>
+          </div>
+
+          <div className="space-y-2">
+            <Label htmlFor="tt-color" className="text-xs text-muted-foreground">
+              Farbe (optional, #rrggbb)
+            </Label>
+            <div className="flex gap-2">
+              <Input
+                id="tt-color"
+                value={color}
+                onChange={e => onColorChange(e.target.value)}
+                placeholder="#3b82f6"
+                className="min-w-0 flex-1 font-mono text-sm"
+                autoComplete="off"
+              />
+              <Input
+                type="color"
+                className="h-9 w-11 shrink-0 cursor-pointer rounded-md border p-1"
+                value={/^#[0-9A-Fa-f]{6}$/.test(color) ? color : "#64748b"}
+                onChange={e => onColorChange(e.target.value)}
+                aria-label="Farbe wählen"
+              />
+            </div>
+          </div>
+        </div>
+      </div>
+    </div>
+  );
+}

src/features/tag-tree/TagTreeNodeRow.tsx

@@ -0,0 +1,85 @@
+import { Pencil, Plus, Trash2 } from "lucide-react";
+import type { MouseEvent } from "react";
+import { formatTreeTagDisplay } from "@/lib/treeTagDisplay";
+import { cn } from "@/lib/utils";
+import type { TagTreeNode } from "@/types/tagTree";
+import { Button } from "@/components/ui/button";
+
+type Props = {
+  node: TagTreeNode;
+  depth: number;
+  isActive: boolean;
+  busy: boolean;
+  onEdit: (n: TagTreeNode) => void;
+  onAddChild: (parentId: number) => void;
+  onDelete: (id: number, e?: MouseEvent) => void;
+};
+
+export function TagTreeNodeRow({ node: n, depth, isActive, busy, onEdit, onAddChild, onDelete }: Props) {
+  return (
+    <li role="none">
+      <div
+        className={cn(
+          "group flex items-center gap-0.5 rounded-md border border-transparent py-0.5 transition-colors",
+          isActive ? "border-border bg-background shadow-sm" : "hover:border-border/50 hover:bg-muted/40",
+        )}
+      >
+        <div className="flex min-w-0 flex-1 items-center gap-2 py-1 pr-1" style={{ paddingLeft: `${8 + depth * 12}px` }}>
+          <span
+            className="size-1.5 shrink-0 rounded-full ring-1 ring-border"
+            style={{
+              backgroundColor: n.color ?? "hsl(var(--muted-foreground) / 0.3)",
+            }}
+            title={n.color ? `Farbe ${n.color}` : "Keine Farbe"}
+            aria-hidden
+          />
+          <div className="min-w-0 flex-1">
+            <div className="truncate text-xs font-medium leading-snug">{formatTreeTagDisplay(n.name, n.label_prefix)}</div>
+            <div className="truncate font-mono text-[10px] leading-tight text-muted-foreground">{n.name}</div>
+          </div>
+        </div>
+        <div className="flex shrink-0 items-center gap-0 pr-0.5">
+          <Button
+            type="button"
+            variant="ghost"
+            size="icon-sm"
+            className="size-7 text-muted-foreground hover:text-foreground"
+            title="Bearbeiten"
+            disabled={busy}
+            onClick={() => onEdit(n)}
+          >
+            <Pencil className="size-3.5" aria-hidden />
+            <span className="sr-only">Bearbeiten</span>
+          </Button>
+          <Button
+            type="button"
+            variant="ghost"
+            size="icon-sm"
+            className="size-7 text-muted-foreground hover:text-foreground"
+            title="Unterknoten"
+            disabled={busy}
+            onClick={e => {
+              e.stopPropagation();
+              onAddChild(n.id);
+            }}
+          >
+            <Plus className="size-3.5" aria-hidden />
+            <span className="sr-only">Unterknoten anlegen</span>
+          </Button>
+          <Button
+            type="button"
+            variant="ghost"
+            size="icon-sm"
+            className="size-7 text-muted-foreground hover:text-destructive"
+            title="Löschen"
+            disabled={busy}
+            onClick={e => void onDelete(n.id, e)}
+          >
+            <Trash2 className="size-3.5" aria-hidden />
+            <span className="sr-only">Löschen</span>
+          </Button>
+        </div>
+      </div>
+    </li>
+  );
+}

src/features/tag-tree/orderTagTree.ts

@@ -0,0 +1,24 @@
+import type { TagTreeNode } from "@/types/tagTree";
+
+export function orderedWithDepth(nodes: TagTreeNode[]): { node: TagTreeNode; depth: number }[] {
+  const byParent = new Map<number | null, TagTreeNode[]>();
+  for (const n of nodes) {
+    const p = n.parent_id;
+    const list = byParent.get(p);
+    if (list) list.push(n);
+    else byParent.set(p, [n]);
+  }
+  for (const list of byParent.values()) {
+    list.sort((a, b) => a.name.localeCompare(b.name, undefined, { sensitivity: "base" }));
+  }
+  const walk = (parentId: number | null, depth: number): { node: TagTreeNode; depth: number }[] => {
+    const kids = byParent.get(parentId) ?? [];
+    const out: { node: TagTreeNode; depth: number }[] = [];
+    for (const k of kids) {
+      out.push({ node: k, depth });
+      out.push(...walk(k.id, depth + 1));
+    }
+    return out;
+  };
+  return walk(null, 0);
+}

src/features/tag-tree/useTagTreeParentOptions.ts

@@ -0,0 +1,26 @@
+import { useMemo } from "react";
+import type { TagTreeNode } from "@/types/tagTree";
+
+export function useTagTreeParentOptions(nodes: TagTreeNode[], editingId: number | null): TagTreeNode[] {
+  return useMemo(() => {
+    const blocked = new Set<number>();
+    if (editingId != null) {
+      blocked.add(editingId);
+      const children = new Map<number | null, number[]>();
+      for (const n of nodes) {
+        const p = n.parent_id;
+        const list = children.get(p);
+        if (list) list.push(n.id);
+        else children.set(p, [n.id]);
+      }
+      const stack = [...(children.get(editingId) ?? [])];
+      while (stack.length) {
+        const id = stack.pop()!;
+        blocked.add(id);
+        const kids = children.get(id);
+        if (kids) for (const k of kids) stack.push(k);
+      }
+    }
+    return nodes.filter(n => !blocked.has(n.id));
+  }, [nodes, editingId]);
+}

src/index.css

@@ -10,6 +10,16 @@
   }
 }
 
+@font-face {
+  font-family: 'Inter';
+  /* src: url('./assets/fonts/Inter-Variable.ttf') format('truetype'); */
+  src: url('./assets/fonts/Inter-var.woff2') format('woff2');
+  font-style: normal;
+  font-weight: normal;
+  font-display: swap;
+}
+
+
 /* cool Bun background animation 😎 */
 body::before {
   content: "";
@@ -49,3 +59,369 @@ body::before {
     animation: none !important;
   }
 }
+
+/* Markdown rendering (marked HTML) */
+@layer components {
+  .snippet-md {
+    font-size: 0.76rem;
+    font-family: 'Inter';
+  }
+
+  .snippet-md :where(p) {
+    margin-block: 0.5rem;
+  }
+
+  .snippet-md :where(a) {
+    color: var(--primary);
+    text-decoration: underline;
+    text-underline-offset: 2px;
+  }
+
+  .snippet-md :where(a):hover {
+    text-decoration-thickness: 2px;
+  }
+
+  .snippet-md :where(blockquote) {
+    margin-block: 0.5rem;
+    border-left: 2px solid var(--border);
+    padding-left: 0.75rem;
+    font-style: italic;
+    color: var(--muted-foreground);
+  }
+
+  .snippet-md :where(code:not(.hljs)) {
+    border-radius: var(--radius-sm, 0.25rem);
+    background-color: var(--muted);
+    padding: 0.125rem 0.25rem;
+    font-size: 0.76rem;
+  }
+
+  .snippet-md :where(pre:not(.snippet-pre)) {
+    margin-block: 0.5rem;
+    overflow-x: auto;
+    border-radius: var(--radius-md, 0.375rem);
+    background-color: var(--muted);
+    padding: 0.75rem;
+  }
+
+  .snippet-md :where(pre:not(.snippet-pre) code) {
+    background-color: transparent;
+    padding: 0;
+    font-size: 0.76rem;
+  }
+
+  /* Highlight.js Codeblöcke */
+  .snippet-md :where(pre.snippet-pre) {
+    margin-block: 0.5rem;
+    overflow-x: auto;
+    border-radius: var(--radius-md, 0.375rem);
+    border: 1px solid var(--border);
+    background-color: color-mix(in oklch, var(--muted) 88%, var(--background));
+    padding: 0.65rem 0.75rem;
+    box-shadow: inset 0 1px 0 color-mix(in oklch, white 55%, transparent);
+  }
+
+  .dark .snippet-md :where(pre.snippet-pre) {
+    box-shadow: inset 0 1px 0 color-mix(in oklch, white 8%, transparent);
+  }
+
+  .snippet-md :where(pre.snippet-pre code.hljs) {
+    display: block;
+    width: max-content;
+    min-width: 100%;
+    padding: 0;
+    font-size: 0.76rem;
+    line-height: 1.55;
+    tab-size: 2;
+    background: transparent !important;
+  }
+
+  .snippet-tag-cloud {
+    border-radius: 0.75rem;
+    border: 1px solid color-mix(in oklch, var(--border) 85%, transparent);
+    background: linear-gradient(
+      165deg,
+      color-mix(in oklch, var(--muted) 55%, transparent) 0%,
+      color-mix(in oklch, var(--muted) 22%, transparent) 100%
+    );
+    padding: 0.4rem 0.5rem;
+    box-shadow: inset 0 1px 0 color-mix(in oklch, white 40%, transparent);
+  }
+
+  .dark .snippet-tag-cloud {
+    box-shadow: inset 0 1px 0 color-mix(in oklch, white 6%, transparent);
+  }
+
+  .snippet-md :where(h1) {
+    margin-block: 0 0.5rem;
+    font-size: 0.76rem;
+    font-weight: 600;
+  }
+
+  .snippet-md :where(h2) {
+    margin-block: 0.75rem 0.5rem;
+    font-size: 0.76rem;
+    font-weight: 600;
+  }
+
+  .snippet-md :where(h3) {
+    margin-block: 0.5rem 0.25rem;
+    font-size: 0.76rem;
+    font-weight: 600;
+  }
+
+  /* Listen: outside + Einzug, damit Verschachtelung sichtbar ist */
+  .snippet-md :where(ul, ol) {
+    margin-block: 0.5rem;
+    list-style-position: outside;
+    padding-inline-start: 1.35rem;
+  }
+
+  .snippet-md :where(ul) {
+    list-style-type: disc;
+  }
+
+  .snippet-md :where(ol) {
+    list-style-type: decimal;
+  }
+
+  .snippet-md :where(li) {
+    margin-block: 0.2rem;
+    padding-inline-start: 0.15rem;
+  }
+
+  .snippet-md :where(li > ul, li > ol) {
+    margin-block: 0.35rem;
+  }
+
+  .snippet-md input.snippet-task-cb {
+    margin-inline-end: 0.35rem;
+    vertical-align: middle;
+    accent-color: var(--primary);
+    cursor: pointer;
+  }
+
+  /* Karteninhalt: begrenzte Höhe, langer Text scrollt */
+  .snippet-md-viewport {
+    max-height: min(52vh, 28rem);
+  }
+
+  .snippet-md :where(table) {
+    width: 100%;
+    border-collapse: collapse;
+    font-size: 0.76rem;
+  }
+
+  .snippet-md :where(th, td) {
+    border: 1px solid var(--border);
+    padding: 0.375rem 0.5rem;
+  }
+
+  .snippet-md :where(hr) {
+    margin-block: 1rem;
+    border: 0;
+    border-top: 1px solid var(--border);
+  }
+
+  .snippet-md :where(img) {
+    max-width: 100%;
+    height: auto;
+  }
+
+  /* Snippet-Karten: etwas dichter, Fokus auf Fließtext */
+  .snippet-md-card-wrap .snippet-md {
+    font-size: 0.76rem;
+    line-height: 1.55;
+  }
+
+  .snippet-md-card-wrap .snippet-md :where(p) {
+    margin-block: 0.375rem;
+  }
+
+  .snippet-md-card-wrap .snippet-md :where(p:first-child) {
+    margin-block-start: 0;
+  }
+
+  .snippet-md-card-wrap .snippet-md :where(p:last-child) {
+    margin-block-end: 0;
+  }
+
+  .snippet-md-card-wrap .snippet-md :where(h1, h2, h3) {
+    margin-block-start: 0.5rem;
+    margin-block-end: 0.25rem;
+  }
+
+  .snippet-md-card-wrap .snippet-md :where(pre:not(.snippet-pre)) {
+    margin-block: 0.375rem;
+    padding: 0.5rem;
+  }
+
+  .snippet-md-card-wrap .snippet-md :where(pre.snippet-pre) {
+    margin-block: 0.375rem;
+    padding: 0.45rem 0.55rem;
+  }
+
+  /* App dialogs: shared layout (Tailwind here, short class names in TSX) */
+  .dialog-snippet-header {
+    @apply shrink-0 space-y-1 border-b px-5 pb-3 pt-5 pr-12 text-start sm:px-6 sm:pr-14;
+  }
+
+  .dialog-snippet-body {
+    /* no overflow-hidden: would clip focus ring (box-shadow) on inputs */
+    @apply flex min-h-0 flex-1 flex-col gap-2 px-5 py-3 sm:px-6;
+  }
+
+  .dialog-snippet-footer {
+    @apply shrink-0 flex-row flex-wrap items-center justify-between gap-2 border-t px-5 py-3 sm:px-6;
+  }
+
+  .dialog-snippet-editor {
+    @apply flex min-h-0 flex-1 flex-col;
+  }
+
+  .dialog-snippet-editor-with-preview {
+    @apply flex min-h-0 flex-1 flex-col gap-3 lg:flex-row;
+  }
+
+  .dialog-snippet-preview {
+    @apply min-h-0 max-h-[min(50vh,26rem)] flex-1 overflow-auto rounded-md border bg-muted/30 p-3 lg:w-1/2;
+  }
+
+  .dialog-snippet-textarea {
+    @apply min-h-0 w-full flex-1 resize-none font-mono text-sm lg:min-h-0;
+  }
+
+  .tag-suggest-dropdown {
+    @apply absolute z-50 mt-1 max-h-40 w-full overflow-auto rounded-md border bg-popover py-1 text-sm shadow-md;
+  }
+
+  .tag-suggest-option {
+    @apply flex w-full cursor-pointer flex-col gap-0.5 px-3 py-1.5 text-left hover:bg-accent;
+  }
+
+  .tag-suggest-option-active {
+    @apply bg-accent;
+  }
+
+  .tag-tree-count-chip {
+    @apply rounded-full bg-muted px-2 py-0.5 font-mono text-[10px] text-muted-foreground tabular-nums;
+  }
+
+  .tag-tree-node-list {
+    @apply space-y-0.5;
+  }
+
+  .tag-tree-dialog-header {
+    @apply shrink-0 space-y-2 border-b bg-muted/30 px-5 py-4 text-left sm:px-6;
+  }
+
+  .tag-tree-dialog-hero {
+    @apply flex items-start gap-3;
+  }
+
+  .tag-tree-dialog-icon {
+    @apply mt-0.5 flex size-9 shrink-0 items-center justify-center rounded-lg border bg-background shadow-sm;
+  }
+
+  .tag-tree-dialog-hero-text {
+    @apply min-w-0 flex-1 space-y-1;
+  }
+
+  .tag-tree-dialog-footer {
+    @apply shrink-0 flex-row flex-wrap items-center justify-start gap-2 border-t bg-muted/20 px-4 py-3 sm:px-5;
+  }
+
+  .tag-tree-main {
+    @apply flex min-h-0 flex-1 flex-col lg:flex-row lg:divide-x;
+  }
+
+  .tag-tree-hierarchy {
+    @apply flex min-h-[min(200px,38vh)] flex-col border-b bg-muted/10 lg:min-h-0 lg:border-b-0 lg:bg-muted/5;
+  }
+
+  .tag-tree-hierarchy--with-form {
+    @apply lg:max-w-[min(100%,420px)];
+  }
+
+  .tag-tree-hierarchy--solo {
+    @apply lg:flex-1;
+  }
+
+  .tag-tree-inline-error {
+    @apply border-b border-destructive/30 bg-destructive/10 px-4 py-2 text-sm text-destructive sm:px-5;
+  }
+
+  .tag-tree-toolbar {
+    @apply flex shrink-0 items-center justify-between gap-2 border-b px-4 py-2.5 sm:px-5;
+  }
+
+  .tag-tree-scroll {
+    @apply min-h-0 flex-1 overflow-y-auto px-2 py-2 sm:px-3;
+  }
+
+  .tag-tree-empty {
+    @apply flex flex-col items-center justify-center gap-3 px-4 py-10 text-center;
+  }
+
+  .tag-tree-loading {
+    @apply flex flex-col items-center justify-center gap-2 py-12 text-muted-foreground;
+  }
+
+  /*
+   * Native <input type="date"> — Feld, WebKit-Segmente & Kalender-Icon.
+   * Das aufklappende Kalender-Popup gestaltet weiterhin der Browser.
+   */
+  .date-field {
+    color-scheme: light;
+  }
+
+  .dark .date-field {
+    color-scheme: dark;
+  }
+
+  .date-field::-webkit-datetime-edit,
+  .date-field::-webkit-datetime-edit-fields-wrapper {
+    padding: 0.05rem 0;
+  }
+
+  .date-field::-webkit-datetime-edit-text {
+    color: var(--muted-foreground);
+    padding: 0 0.1rem;
+  }
+
+  .date-field::-webkit-datetime-edit-day-field,
+  .date-field::-webkit-datetime-edit-month-field,
+  .date-field::-webkit-datetime-edit-year-field {
+    padding: 0.1rem 0.2rem;
+    border-radius: 0.2rem;
+  }
+
+  .date-field:focus::-webkit-datetime-edit-day-field,
+  .date-field:focus::-webkit-datetime-edit-month-field,
+  .date-field:focus::-webkit-datetime-edit-year-field,
+  .date-field:focus-visible::-webkit-datetime-edit-day-field,
+  .date-field:focus-visible::-webkit-datetime-edit-month-field,
+  .date-field:focus-visible::-webkit-datetime-edit-year-field {
+    background-color: color-mix(in oklch, var(--accent) 45%, transparent);
+    color: var(--accent-foreground);
+  }
+
+  .date-field::-webkit-calendar-picker-indicator {
+    cursor: pointer;
+    opacity: 0.65;
+    border-radius: 0.25rem;
+    padding: 0.15rem 0.35rem;
+    margin-inline-start: 0.125rem;
+    transition: opacity 0.12s ease, background-color 0.12s ease;
+  }
+
+  .date-field:hover::-webkit-calendar-picker-indicator {
+    opacity: 1;
+    background-color: color-mix(in oklch, var(--muted) 75%, transparent);
+  }
+
+  .date-field:focus::-webkit-calendar-picker-indicator,
+  .date-field:focus-visible::-webkit-calendar-picker-indicator {
+    opacity: 1;
+  }
+}

src/index.ts

@@ -1,109 +1,15 @@
 import { serve } from "bun";
 import index from "./index.html";
 import { getDb } from "./server/db";
-import { createSnippet, deleteSnippet, getSnippetById, listSnippets, updateSnippet } from "./server/snippets";
+import { snippetRoutes } from "./server/routes/snippetsHandlers";
+import { tagTreeRoutes } from "./server/routes/tagTreeHandlers";
 
 getDb();
 
-async function readJson(req: Request): Promise<unknown> {
-  try {
-    return await req.json();
-  } catch {
-    return null;
-  }
-}
-
 const server = serve({
   routes: {
-    "/api/snippets": {
-      async GET(req) {
-        const url = new URL(req.url);
-        const q = url.searchParams.get("q");
-        const sort = url.searchParams.get("sort");
-        return Response.json(listSnippets(q, sort));
-      },
-      async POST(req) {
-        const body = await readJson(req);
-        if (!body || typeof body !== "object") {
-          return Response.json({ error: "Invalid JSON body" }, { status: 400 });
-        }
-        const o = body as Record<string, unknown>;
-        const tags = Array.isArray(o.tags)
-          ? o.tags.filter((t): t is string => typeof t === "string")
-          : [];
-        const snippet = createSnippet({
-          title:
-            o.title === null
-              ? null
-              : typeof o.title === "string"
-                ? o.title
-                : undefined,
-          body: typeof o.body === "string" ? o.body : "",
-          tags,
-        });
-        return Response.json(snippet, { status: 201 });
-      },
-    },
-
-    "/api/snippets/:id": {
-      async GET(req) {
-        const id = Number(req.params.id);
-        if (!Number.isFinite(id)) {
-          return Response.json({ error: "Invalid id" }, { status: 400 });
-        }
-        const snippet = getSnippetById(id);
-        if (!snippet) {
-          return Response.json({ error: "Not found" }, { status: 404 });
-        }
-        return Response.json(snippet);
-      },
-      async PATCH(req) {
-        const id = Number(req.params.id);
-        if (!Number.isFinite(id)) {
-          return Response.json({ error: "Invalid id" }, { status: 400 });
-        }
-        const body = await readJson(req);
-        if (!body || typeof body !== "object") {
-          return Response.json({ error: "Invalid JSON body" }, { status: 400 });
-        }
-        const o = body as Record<string, unknown>;
-        const patch: {
-          title?: string | null;
-          body?: string;
-          tags?: string[];
-          sort_order?: number;
-        } = {};
-        if ("title" in o) {
-          patch.title = o.title === null ? null : String(o.title);
-        }
-        if ("body" in o && typeof o.body === "string") {
-          patch.body = o.body;
-        }
-        if ("tags" in o && Array.isArray(o.tags)) {
-          patch.tags = o.tags.filter((t): t is string => typeof t === "string");
-        }
-        if ("sort_order" in o && typeof o.sort_order === "number" && Number.isFinite(o.sort_order)) {
-          patch.sort_order = o.sort_order;
-        }
-        const snippet = updateSnippet(id, patch);
-        if (!snippet) {
-          return Response.json({ error: "Not found" }, { status: 404 });
-        }
-        return Response.json(snippet);
-      },
-      async DELETE(req) {
-        const id = Number(req.params.id);
-        if (!Number.isFinite(id)) {
-          return Response.json({ error: "Invalid id" }, { status: 400 });
-        }
-        const ok = deleteSnippet(id);
-        if (!ok) {
-          return Response.json({ error: "Not found" }, { status: 404 });
-        }
-        return new Response(null, { status: 204 });
-      },
-    },
-
+    ...snippetRoutes,
+    ...tagTreeRoutes,
     "/*": index,
   },
 

src/lib/snippetDeadline.ts

@@ -0,0 +1,55 @@
+/** Kalendertag lokal als `YYYY-MM-DD` (für Vergleich mit DB). */
+export function localDateKey(d: Date): string {
+  const y = d.getFullYear();
+  const m = String(d.getMonth() + 1).padStart(2, "0");
+  const day = String(d.getDate()).padStart(2, "0");
+  return `${y}-${m}-${day}`;
+}
+
+/** UI-Wert für `<input type="date" />` aus API-Wert. */
+export function deadlineToDateInput(deadlineAt: string | null | undefined): string {
+  if (!deadlineAt) return "";
+  const s = deadlineAt.trim();
+  if (/^\d{4}-\d{2}-\d{2}$/.test(s)) return s;
+  const t = new Date(s);
+  if (Number.isNaN(t.getTime())) return "";
+  return localDateKey(t);
+}
+
+export type DeadlineTone = "none" | "upcoming" | "today" | "overdue";
+
+/** Blau = künftig (nicht heute), Orange = heute fällig, Rot = überschritten. */
+export function deadlineTone(deadlineAt: string | null | undefined): DeadlineTone {
+  if (!deadlineAt) return "none";
+  const key = deadlineToDateInput(deadlineAt);
+  if (!key) return "none";
+  const today = localDateKey(new Date());
+  if (key < today) return "overdue";
+  if (key === today) return "today";
+  return "upcoming";
+}
+
+export function deadlineBadgeClass(tone: DeadlineTone): string {
+  switch (tone) {
+    case "upcoming":
+      return "text-blue-500/70 text-blue-800 dark:text-blue-200";
+    case "today":
+      return "text-orange-500/80 text-orange-900 dark:text-orange-100";
+    case "overdue":
+      return "text-destructive/80 text-destructive";
+    default:
+      return "";
+  }
+}
+
+export function formatDeadlineLabel(deadlineAt: string): string {
+  const key = deadlineToDateInput(deadlineAt);
+  if (!key) return deadlineAt;
+  try {
+    const [y, m, d] = key.split("-").map(Number);
+    const dt = new Date(y, m - 1, d);
+    return dt.toLocaleDateString(undefined, { dateStyle: "medium" });
+  } catch {
+    return key;
+  }
+}

src/lib/treeTagDisplay.ts

@@ -0,0 +1,6 @@
+/** Darstellung: optionaler Prefix + Leerzeichen + kanonischer Name (z. B. Projekt: sp-migrator). */
+export function formatTreeTagDisplay(name: string, labelPrefix: string | null | undefined): string {
+  const p = labelPrefix?.trim();
+  if (!p) return name;
+  return `${p} ${name}`.trim();
+}

src/server/db.ts

@@ -2,34 +2,9 @@ import { Database } from "bun:sqlite";
 import { mkdirSync } from "fs";
 import path from "path";
 
-let dbInstance: Database | null = null;
+import { migrate } from "./db/migrate";
 
-function migrate(database: Database) {
-  database.run(`
-    CREATE TABLE IF NOT EXISTS snippets (
-      id INTEGER PRIMARY KEY AUTOINCREMENT,
-      title TEXT,
-      body TEXT NOT NULL DEFAULT '',
-      sort_order INTEGER NOT NULL DEFAULT 0,
-      created_at TEXT NOT NULL,
-      updated_at TEXT NOT NULL
-    );
-  `);
-  database.run(`
-    CREATE TABLE IF NOT EXISTS tags (
-      id INTEGER PRIMARY KEY AUTOINCREMENT,
-      name TEXT NOT NULL UNIQUE COLLATE NOCASE
-    );
-  `);
-  database.run(`
-    CREATE TABLE IF NOT EXISTS snippet_tags (
-      snippet_id INTEGER NOT NULL REFERENCES snippets(id) ON DELETE CASCADE,
-      tag_id INTEGER NOT NULL REFERENCES tags(id) ON DELETE CASCADE,
-      PRIMARY KEY (snippet_id, tag_id)
-    );
-  `);
-  database.run(`CREATE INDEX IF NOT EXISTS idx_snippets_updated ON snippets(updated_at);`);
-}
+let dbInstance: Database | null = null;
 
 export function getDb(): Database {
   if (dbInstance) return dbInstance;

src/server/db/migrate.ts

@@ -0,0 +1,75 @@
+import type { Database } from "bun:sqlite";
+
+/**
+ * Einmaliges Kernschema — so, als würde eine leere DB zum ersten Mal angelegt.
+ * `CREATE TABLE IF NOT EXISTS` ändert bestehende Tabellen nicht; fehlende Spalten
+ * werden danach idempotent per `ensureColumn` nachgezogen (bestehende Zeilen bleiben).
+ */
+
+function assertSqlIdent(name: string, label: string): void {
+  if (!/^[a-z][a-z0-9_]*$/i.test(name)) {
+    throw new Error(`${label} ist kein gültiger SQL-Identifier: ${name}`);
+  }
+}
+
+function tableHasColumn(database: Database, table: string, column: string): boolean {
+  assertSqlIdent(table, "Tabellenname");
+  assertSqlIdent(column, "Spaltenname");
+  const cols = database.query(`PRAGMA table_info(${table})`).all() as { name: string }[];
+  return cols.some(c => c.name === column);
+}
+
+/** Fügt eine Spalte nur hinzu, wenn sie noch fehlt (keine Exceptions als Steuerung). */
+function ensureColumn(database: Database, table: string, column: string, sqlType: string): void {
+  if (tableHasColumn(database, table, column)) return;
+  assertSqlIdent(table, "Tabellenname");
+  assertSqlIdent(column, "Spaltenname");
+  database.run(`ALTER TABLE ${table} ADD COLUMN ${column} ${sqlType}`);
+}
+
+export function migrate(database: Database): void {
+  database.run(`
+    CREATE TABLE IF NOT EXISTS snippets (
+      id INTEGER PRIMARY KEY AUTOINCREMENT,
+      title TEXT,
+      body TEXT NOT NULL DEFAULT '',
+      sort_order INTEGER NOT NULL DEFAULT 0,
+      created_at TEXT NOT NULL,
+      updated_at TEXT NOT NULL,
+      deadline_at TEXT
+    );
+  `);
+
+  database.run(`
+    CREATE TABLE IF NOT EXISTS tags (
+      id INTEGER PRIMARY KEY AUTOINCREMENT,
+      name TEXT NOT NULL UNIQUE COLLATE NOCASE
+    );
+  `);
+
+  database.run(`
+    CREATE TABLE IF NOT EXISTS snippet_tags (
+      snippet_id INTEGER NOT NULL REFERENCES snippets(id) ON DELETE CASCADE,
+      tag_id INTEGER NOT NULL REFERENCES tags(id) ON DELETE CASCADE,
+      PRIMARY KEY (snippet_id, tag_id)
+    );
+  `);
+
+  database.run(`
+    CREATE TABLE IF NOT EXISTS tag_tree_nodes (
+      id INTEGER PRIMARY KEY AUTOINCREMENT,
+      name TEXT NOT NULL UNIQUE COLLATE NOCASE,
+      parent_id INTEGER REFERENCES tag_tree_nodes(id) ON DELETE CASCADE,
+      color TEXT,
+      label_prefix TEXT
+    );
+  `);
+
+  /* Bestehende Installationen: Tabellen schon da, einzelne Spalten fehlen → ALTER nur bei Bedarf */
+  // ensureColumn(database, "snippets", "deadline_at", "TEXT");
+  // ensureColumn(database, "tag_tree_nodes", "label_prefix", "TEXT");
+
+  database.run(`CREATE INDEX IF NOT EXISTS idx_tag_tree_parent ON tag_tree_nodes(parent_id);`);
+  database.run(`CREATE INDEX IF NOT EXISTS idx_snippets_updated ON snippets(updated_at);`);
+  database.run(`CREATE INDEX IF NOT EXISTS idx_snippets_deadline ON snippets(deadline_at);`);
+}

src/server/http/readJson.ts

@@ -0,0 +1,7 @@
+export async function readJson(req: Request): Promise<unknown> {
+  try {
+    return await req.json();
+  } catch {
+    return null;
+  }
+}

src/server/routes/snippetsHandlers.ts

@@ -0,0 +1,113 @@
+import { readJson } from "@/server/http/readJson";
+import {
+  createSnippet,
+  deleteSnippet,
+  getSnippetById,
+  listSnippets,
+  normalizeDeadlineAtInput,
+  updateSnippet,
+} from "@/server/snippets";
+
+export const snippetRoutes = {
+  "/api/snippets": {
+    async GET(req: Request) {
+      const url = new URL(req.url);
+      const q = url.searchParams.get("q");
+      const sort = url.searchParams.get("sort");
+      return Response.json(listSnippets(q, sort));
+    },
+    async POST(req: Request) {
+      const body = await readJson(req);
+      if (!body || typeof body !== "object") {
+        return Response.json({ error: "Invalid JSON body" }, { status: 400 });
+      }
+      const o = body as Record<string, unknown>;
+      const tags = Array.isArray(o.tags) ? o.tags.filter((t): t is string => typeof t === "string") : [];
+      let deadline_at: string | null | undefined;
+      if ("deadline_at" in o) {
+        try {
+          deadline_at = normalizeDeadlineAtInput(o.deadline_at);
+        } catch (e) {
+          const msg = e instanceof Error ? e.message : "deadline_at ungültig";
+          return Response.json({ error: msg }, { status: 400 });
+        }
+      }
+      const snippet = createSnippet({
+        title:
+          o.title === null ? null : typeof o.title === "string" ? o.title : undefined,
+        body: typeof o.body === "string" ? o.body : "",
+        tags,
+        deadline_at,
+      });
+      return Response.json(snippet, { status: 201 });
+    },
+  },
+
+  "/api/snippets/:id": {
+    async GET(req: Request) {
+      const id = Number((req as Request & { params: { id: string } }).params.id);
+      if (!Number.isFinite(id)) {
+        return Response.json({ error: "Invalid id" }, { status: 400 });
+      }
+      const snippet = getSnippetById(id);
+      if (!snippet) {
+        return Response.json({ error: "Not found" }, { status: 404 });
+      }
+      return Response.json(snippet);
+    },
+    async PATCH(req: Request) {
+      const id = Number((req as Request & { params: { id: string } }).params.id);
+      if (!Number.isFinite(id)) {
+        return Response.json({ error: "Invalid id" }, { status: 400 });
+      }
+      const body = await readJson(req);
+      if (!body || typeof body !== "object") {
+        return Response.json({ error: "Invalid JSON body" }, { status: 400 });
+      }
+      const o = body as Record<string, unknown>;
+      const patch: {
+        title?: string | null;
+        body?: string;
+        tags?: string[];
+        sort_order?: number;
+        deadline_at?: string | null;
+      } = {};
+      if ("title" in o) {
+        patch.title = o.title === null ? null : String(o.title);
+      }
+      if ("body" in o && typeof o.body === "string") {
+        patch.body = o.body;
+      }
+      if ("tags" in o && Array.isArray(o.tags)) {
+        patch.tags = o.tags.filter((t): t is string => typeof t === "string");
+      }
+      if ("sort_order" in o && typeof o.sort_order === "number" && Number.isFinite(o.sort_order)) {
+        patch.sort_order = o.sort_order;
+      }
+      if ("deadline_at" in o) {
+        try {
+          patch.deadline_at = normalizeDeadlineAtInput(o.deadline_at);
+        } catch (e) {
+          const msg = e instanceof Error ? e.message : "deadline_at ungültig";
+          return Response.json({ error: msg }, { status: 400 });
+        }
+      }
+      const snippet = updateSnippet(id, patch);
+      if (!snippet) {
+        return Response.json({ error: "Not found" }, { status: 404 });
+      }
+      return Response.json(snippet);
+    },
+    async DELETE(req: Request) {
+      const id = Number((req as Request & { params: { id: string } }).params.id);
+      if (!Number.isFinite(id)) {
+        return Response.json({ error: "Invalid id" }, { status: 400 });
+      }
+      const ok = deleteSnippet(id);
+      if (!ok) {
+        return Response.json({ error: "Not found" }, { status: 404 });
+      }
+      return new Response(null, { status: 204 });
+    },
+  },
+};

src/server/routes/tagTreeHandlers.ts

@@ -0,0 +1,112 @@
+import { getDb } from "@/server/db";
+import { readJson } from "@/server/http/readJson";
+import {
+  createTagTreeNode,
+  deleteTagTreeNode,
+  listTagTreeNodes,
+  suggestTagTreeItems,
+  updateTagTreeNode,
+} from "@/server/tagTree";
+
+export const tagTreeRoutes = {
+  "/api/tag-suggestions": {
+    async GET(req: Request) {
+      const url = new URL(req.url);
+      const q = url.searchParams.get("q") ?? "";
+      const database = getDb();
+      return Response.json({ items: suggestTagTreeItems(database, q) });
+    },
+  },
+
+  "/api/tag-tree": {
+    async GET() {
+      return Response.json(listTagTreeNodes());
+    },
+    async POST(req: Request) {
+      const body = await readJson(req);
+      if (!body || typeof body !== "object") {
+        return Response.json({ error: "Invalid JSON body" }, { status: 400 });
+      }
+      const o = body as Record<string, unknown>;
+      try {
+        const node = createTagTreeNode({
+          name: typeof o.name === "string" ? o.name : "",
+          parent_id:
+            o.parent_id === null || o.parent_id === undefined
+              ? null
+              : typeof o.parent_id === "number"
+                ? o.parent_id
+                : Number(o.parent_id),
+          color: o.color === null || o.color === undefined ? null : String(o.color),
+          label_prefix:
+            o.label_prefix === null || o.label_prefix === undefined
+              ? null
+              : typeof o.label_prefix === "string"
+                ? o.label_prefix
+                : String(o.label_prefix),
+        });
+        return Response.json(node, { status: 201 });
+      } catch (e) {
+        const msg = e instanceof Error ? e.message : "Fehler";
+        return Response.json({ error: msg }, { status: 400 });
+      }
+    },
+  },
+
+  "/api/tag-tree/:id": {
+    async PATCH(req: Request) {
+      const id = Number((req as Request & { params: { id: string } }).params.id);
+      if (!Number.isFinite(id)) {
+        return Response.json({ error: "Invalid id" }, { status: 400 });
+      }
+      const body = await readJson(req);
+      if (!body || typeof body !== "object") {
+        return Response.json({ error: "Invalid JSON body" }, { status: 400 });
+      }
+      const o = body as Record<string, unknown>;
+      const patch: {
+        name?: string;
+        parent_id?: number | null;
+        color?: string | null;
+        label_prefix?: string | null;
+      } = {};
+      if ("name" in o && typeof o.name === "string") patch.name = o.name;
+      if ("parent_id" in o) {
+        patch.parent_id =
+          o.parent_id === null ? null : typeof o.parent_id === "number" ? o.parent_id : Number(o.parent_id);
+      }
+      if ("color" in o) {
+        patch.color = o.color === null || o.color === undefined ? null : String(o.color);
+      }
+      if ("label_prefix" in o) {
+        patch.label_prefix =
+          o.label_prefix === null || o.label_prefix === undefined
+            ? null
+            : typeof o.label_prefix === "string"
+              ? o.label_prefix
+              : String(o.label_prefix);
+      }
+      try {
+        const node = updateTagTreeNode(id, patch);
+        if (!node) {
+          return Response.json({ error: "Not found" }, { status: 404 });
+        }
+        return Response.json(node);
+      } catch (e) {
+        const msg = e instanceof Error ? e.message : "Fehler";
+        return Response.json({ error: msg }, { status: 400 });
+      }
+    },
+    async DELETE(req: Request) {
+      const id = Number((req as Request & { params: { id: string } }).params.id);
+      if (!Number.isFinite(id)) {
+        return Response.json({ error: "Invalid id" }, { status: 400 });
+      }
+      const ok = deleteTagTreeNode(id);
+      if (!ok) {
+        return Response.json({ error: "Not found" }, { status: 404 });
+      }
+      return new Response(null, { status: 204 });
+    },
+  },
+};

src/server/snippets.ts

@@ -1,5 +1,15 @@
 import type { Database } from "bun:sqlite";
 import { getDb } from "./db";
+import {
+  colorsForTagNames,
+  decodeSnippetTagDisplay,
+  encodeTreeTagStorage,
+  escapeLike,
+  expandExactTreeTagNames,
+  matchingTreeTagNamesForLikePattern,
+  treeStorageRefsForDisplayNames,
+  treeTagDisplayForCanonicalName,
+} from "./tagTree";
 
 export type SnippetRow = {
   id: number;
@@ -8,21 +18,33 @@ export type SnippetRow = {
   sort_order: number;
   created_at: string;
   updated_at: string;
+  deadline_at: string | null;
   tags: string[];
+  /** Anzeige-Label pro Tag (Prefix + Name), gleiche Reihenfolge wie `tags`. */
+  tag_display: string[];
+  /** Farben aus dem Tag-Baum (Schlüssel = Tag-String wie am Snippet, Wert = #rrggbb oder null). */
+  tag_colors: Record<string, string | null>;
 };
 
-function escapeLike(raw: string): string {
-  return raw.replaceAll("\\", "\\\\").replaceAll("%", "\\%").replaceAll("_", "\\_");
+/** PATCH/POST: `undefined` = nicht ändern, `null` = entfernen. */
+export function normalizeDeadlineAtInput(raw: unknown): string | null | undefined {
+  if (raw === undefined) return undefined;
+  if (raw === null) return null;
+  if (typeof raw !== "string") throw new Error("deadline_at muss ein String (YYYY-MM-DD) sein");
+  const t = raw.trim();
+  if (t === "") return null;
+  if (!/^\d{4}-\d{2}-\d{2}$/.test(t)) throw new Error("deadline_at muss YYYY-MM-DD sein");
+  return t;
 }
 
 /** `tag:x`, `title:y`, `content:z` (case-insensitive); remainder = default (title OR tag names, LIKE). All parts AND. */
 function parseSearchQuery(raw: string): {
   defaultText: string | null;
-  tagTerms: string[];
+  tagTermsRaw: string[];
   titleTerms: string[];
   contentTerms: string[];
 } {
-  const tagTerms: string[] = [];
+  const tagTermsRaw: string[] = [];
   const titleTerms: string[] = [];
   const contentTerms: string[] = [];
   const re = /(?:^|\s)(tag|title|content):(\S+)/gi;
@@ -33,7 +55,7 @@ function parseSearchQuery(raw: string): {
     const val = m[2];
     if (!val) continue;
     const escaped = escapeLike(val);
-    if (kind === "tag") tagTerms.push(escaped);
+    if (kind === "tag") tagTermsRaw.push(val);
     else if (kind === "title") titleTerms.push(escaped);
     else if (kind === "content") contentTerms.push(escaped);
     spans.push([m.index, m.index + m[0].length]);
@@ -44,7 +66,7 @@ function parseSearchQuery(raw: string): {
   }
   const defaultTrim = rest.replace(/\s+/g, " ").trim();
   const defaultText = defaultTrim === "" ? null : escapeLike(defaultTrim);
-  return { defaultText, tagTerms, titleTerms, contentTerms };
+  return { defaultText, tagTermsRaw, titleTerms, contentTerms };
 }
 
 function nowIso(): string {
@@ -59,6 +81,10 @@ function orderClause(sort: string): string {
       return "ORDER BY s.title COLLATE NOCASE ASC NULLS LAST, s.updated_at DESC";
     case "title_desc":
       return "ORDER BY s.title COLLATE NOCASE DESC NULLS LAST, s.updated_at DESC";
+    case "deadline_asc":
+      return "ORDER BY s.deadline_at ASC NULLS LAST, s.updated_at DESC";
+    case "deadline_desc":
+      return "ORDER BY s.deadline_at DESC NULLS LAST, s.updated_at DESC";
     case "manual":
       return "ORDER BY s.sort_order ASC, s.updated_at DESC";
     case "updated_desc":
@@ -89,6 +115,7 @@ function loadTagsForSnippetIds(database: Database, ids: number[]): Map<number, s
 }
 
 function rowToPublic(
+  database: Database,
   row: {
     id: number;
     title: string | null;
@@ -96,9 +123,17 @@ function rowToPublic(
     sort_order: number;
     created_at: string;
     updated_at: string;
+    deadline_at: string | null;
   },
-  tags: string[],
+  tagsRaw: string[],
 ): SnippetRow {
+  const tags = tagsRaw.map(t => decodeSnippetTagDisplay(database, t));
+  const tag_display = tags.map(t => treeTagDisplayForCanonicalName(database, t));
+  const cmap = colorsForTagNames(database, tags);
+  const tag_colors: Record<string, string | null> = {};
+  for (const t of tags) {
+    tag_colors[t] = cmap.get(t) ?? null;
+  }
   return {
     id: row.id,
     title: row.title,
@@ -106,7 +141,10 @@ function rowToPublic(
     sort_order: row.sort_order,
     created_at: row.created_at,
     updated_at: row.updated_at,
+    deadline_at: row.deadline_at,
     tags,
+    tag_display,
+    tag_colors,
   };
 }
 
@@ -122,12 +160,13 @@ export function listSnippets(q: string | null, sort: string | null): SnippetRow[
     sort_order: number;
     created_at: string;
     updated_at: string;
+    deadline_at: string | null;
   }[];
 
   if (trimmed === "") {
     rows = database
       .query(
-        `SELECT s.id, s.title, s.body, s.sort_order, s.created_at, s.updated_at
+        `SELECT s.id, s.title, s.body, s.sort_order, s.created_at, s.updated_at, s.deadline_at
          FROM snippets s
          ${order}`,
       )
@@ -138,18 +177,56 @@ export function listSnippets(q: string | null, sort: string | null): SnippetRow[
     const params: string[] = [];
 
     if (parsed.defaultText !== null) {
-      conditions.push(`(
-        (s.title IS NOT NULL AND s.title LIKE '%' || ? || '%' ESCAPE '\\')
-        OR EXISTS (
+      const treeTagNames = matchingTreeTagNamesForLikePattern(database, parsed.defaultText);
+      const parts: string[] = [
+        `(s.title IS NOT NULL AND s.title LIKE '%' || ? || '%' ESCAPE '\\')`,
+        `EXISTS (
           SELECT 1 FROM snippet_tags st
           JOIN tags t ON t.id = st.tag_id
           WHERE st.snippet_id = s.id
             AND t.name LIKE '%' || ? || '%' ESCAPE '\\'
-        )
-      )`);
+        )`,
+      ];
       params.push(parsed.defaultText, parsed.defaultText);
+      if (treeTagNames.length > 0) {
+        const lower = treeTagNames.map(n => n.toLowerCase());
+        const phLower = lower.map(() => "?").join(", ");
+        const refs = treeStorageRefsForDisplayNames(database, treeTagNames);
+        const sub: string[] = [`lower(t.name) IN (${phLower})`];
+        params.push(...lower);
+        if (refs.length > 0) {
+          const phRefs = refs.map(() => "?").join(", ");
+          sub.push(`t.name IN (${phRefs})`);
+          params.push(...refs);
         }
-    for (const term of parsed.tagTerms) {
+        parts.push(`EXISTS (
+          SELECT 1 FROM snippet_tags st
+          JOIN tags t ON t.id = st.tag_id
+          WHERE st.snippet_id = s.id
+            AND (${sub.join(" OR ")})
+        )`);
+      }
+      conditions.push(`(${parts.join(" OR ")})`);
+    }
+    for (const raw of parsed.tagTermsRaw) {
+      const expanded = expandExactTreeTagNames(database, raw);
+      if (expanded !== null && expanded.length > 0) {
+        const lower = expanded.map(n => n.toLowerCase());
+        const refs = treeStorageRefsForDisplayNames(database, expanded);
+        const sub: string[] = [`lower(t.name) IN (${lower.map(() => "?").join(", ")})`];
+        params.push(...lower);
+        if (refs.length > 0) {
+          sub.push(`t.name IN (${refs.map(() => "?").join(", ")})`);
+          params.push(...refs);
+        }
+        conditions.push(`EXISTS (
+        SELECT 1 FROM snippet_tags st
+        JOIN tags t ON t.id = st.tag_id
+        WHERE st.snippet_id = s.id
+          AND (${sub.join(" OR ")})
+      )`);
+      } else {
+        const term = escapeLike(raw.trim());
         conditions.push(`EXISTS (
         SELECT 1 FROM snippet_tags st
         JOIN tags t ON t.id = st.tag_id
@@ -158,6 +235,7 @@ export function listSnippets(q: string | null, sort: string | null): SnippetRow[
       )`);
         params.push(term);
       }
+    }
     for (const term of parsed.titleTerms) {
       conditions.push(`(s.title IS NOT NULL AND s.title LIKE '%' || ? || '%' ESCAPE '\\')`);
       params.push(term);
@@ -170,7 +248,7 @@ export function listSnippets(q: string | null, sort: string | null): SnippetRow[
     if (conditions.length === 0) {
       rows = database
         .query(
-          `SELECT s.id, s.title, s.body, s.sort_order, s.created_at, s.updated_at
+          `SELECT s.id, s.title, s.body, s.sort_order, s.created_at, s.updated_at, s.deadline_at
            FROM snippets s
            ${order}`,
         )
@@ -179,7 +257,7 @@ export function listSnippets(q: string | null, sort: string | null): SnippetRow[
       const where = conditions.join(" AND ");
       rows = database
         .query(
-          `SELECT s.id, s.title, s.body, s.sort_order, s.created_at, s.updated_at
+          `SELECT s.id, s.title, s.body, s.sort_order, s.created_at, s.updated_at, s.deadline_at
            FROM snippets s
            WHERE ${where}
            ${order}`,
@@ -190,14 +268,14 @@ export function listSnippets(q: string | null, sort: string | null): SnippetRow[
 
   const ids = rows.map(r => r.id);
   const tagMap = loadTagsForSnippetIds(database, ids);
-  return rows.map(r => rowToPublic(r, tagMap.get(r.id) ?? []));
+  return rows.map(r => rowToPublic(database, r, tagMap.get(r.id) ?? []));
 }
 
 export function getSnippetById(id: number): SnippetRow | null {
   const database = getDb();
   const row = database
     .query(
-      `SELECT id, title, body, sort_order, created_at, updated_at FROM snippets WHERE id = ?`,
+      `SELECT id, title, body, sort_order, created_at, updated_at, deadline_at FROM snippets WHERE id = ?`,
     )
     .get(id) as
     | {
@@ -207,11 +285,12 @@ export function getSnippetById(id: number): SnippetRow | null {
         sort_order: number;
         created_at: string;
         updated_at: string;
+        deadline_at: string | null;
       }
     | undefined;
   if (!row) return null;
   const tagMap = loadTagsForSnippetIds(database, [row.id]);
-  return rowToPublic(row, tagMap.get(row.id) ?? []);
+  return rowToPublic(database, row, tagMap.get(row.id) ?? []);
 }
 
 function getOrCreateTagId(database: Database, name: string): number | null {
@@ -230,7 +309,8 @@ function replaceSnippetTags(database: Database, snippetId: number, tagNames: str
   if (unique.length === 0) return;
   const insertLink = database.prepare(`INSERT OR IGNORE INTO snippet_tags (snippet_id, tag_id) VALUES (?, ?)`);
   for (const name of unique) {
-    const tagId = getOrCreateTagId(database, name);
+    const storage = encodeTreeTagStorage(database, name);
+    const tagId = getOrCreateTagId(database, storage);
     if (tagId !== null) insertLink.run(snippetId, tagId);
   }
 }
@@ -240,6 +320,7 @@ export function createSnippet(input: {
   body?: string;
   tags?: string[];
   sort_order?: number;
+  deadline_at?: string | null;
 }): SnippetRow {
   const database = getDb();
   const t = nowIso();
@@ -251,10 +332,12 @@ export function createSnippet(input: {
         : String(input.title).trim();
   const body = input.body ?? "";
   const sortOrder = typeof input.sort_order === "number" ? input.sort_order : Date.now();
+  const deadlineAt =
+    input.deadline_at === undefined ? null : input.deadline_at === null ? null : String(input.deadline_at).trim() || null;
 
   database.run(
-    `INSERT INTO snippets (title, body, sort_order, created_at, updated_at) VALUES (?, ?, ?, ?, ?)`,
-    [title, body, sortOrder, t, t],
+    `INSERT INTO snippets (title, body, sort_order, created_at, updated_at, deadline_at) VALUES (?, ?, ?, ?, ?, ?)`,
+    [title, body, sortOrder, t, t, deadlineAt],
   );
   const idRow = database.query(`SELECT last_insert_rowid() AS id`).get() as { id: number };
   const newId = Number(idRow.id);
@@ -269,6 +352,7 @@ export function updateSnippet(
     body?: string;
     tags?: string[];
     sort_order?: number;
+    deadline_at?: string | null;
   },
 ): SnippetRow | null {
   const database = getDb();
@@ -276,11 +360,12 @@ export function updateSnippet(
   if (!existing) return null;
 
   const current = database
-    .query(`SELECT title, body, sort_order FROM snippets WHERE id = ?`)
+    .query(`SELECT title, body, sort_order, deadline_at FROM snippets WHERE id = ?`)
     .get(id) as {
     title: string | null;
     body: string;
     sort_order: number;
+    deadline_at: string | null;
   };
 
   const title =
@@ -291,11 +376,12 @@ export function updateSnippet(
         : String(input.title).trim();
   const body = input.body === undefined ? current.body : String(input.body);
   const sort_order = input.sort_order === undefined ? current.sort_order : input.sort_order;
+  const deadline_at = input.deadline_at === undefined ? current.deadline_at : input.deadline_at;
   const t = nowIso();
 
   database.run(
-    `UPDATE snippets SET title = ?, body = ?, sort_order = ?, updated_at = ? WHERE id = ?`,
-    [title, body, sort_order, t, id],
+    `UPDATE snippets SET title = ?, body = ?, sort_order = ?, deadline_at = ?, updated_at = ? WHERE id = ?`,
+    [title, body, sort_order, deadline_at, t, id],
   );
 
   if (input.tags !== undefined) {

src/server/tagTree.ts

@@ -0,0 +1,343 @@
+import type { Database } from "bun:sqlite";
+import { formatTreeTagDisplay } from "@/lib/treeTagDisplay";
+import { getDb } from "./db";
+import type { TagTreeNode, TagTreeSuggestion } from "@/types/tagTree";
+
+export { formatTreeTagDisplay } from "@/lib/treeTagDisplay";
+
+/** Bekannte Baum-Tags werden als `#[tag:<nodeIdHex>]` in `tags.name` gespeichert (kein Padding, Kleinbuchstaben). */
+const TAG_REF_RE = /^#\[tag:([0-9a-f]+)\]$/i;
+
+function escapeLike(raw: string): string {
+  return raw.replaceAll("\\", "\\\\").replaceAll("%", "\\%").replaceAll("_", "\\_");
+}
+
+type NodeRow = {
+  id: number;
+  name: string;
+  parent_id: number | null;
+  color: string | null;
+  label_prefix: string | null;
+};
+
+export function treeTagDisplayForCanonicalName(database: Database, canonicalName: string): string {
+  const row = database
+    .query(`SELECT label_prefix FROM tag_tree_nodes WHERE name = ? COLLATE NOCASE`)
+    .get(canonicalName) as { label_prefix: string | null } | undefined;
+  return formatTreeTagDisplay(canonicalName, row?.label_prefix ?? null);
+}
+
+function loadNodeRows(database: Database): NodeRow[] {
+  return database
+    .query(`SELECT id, name, parent_id, color, label_prefix FROM tag_tree_nodes ORDER BY name COLLATE NOCASE ASC`)
+    .all() as NodeRow[];
+}
+
+function buildChildrenMap(rows: NodeRow[]): Map<number | null, number[]> {
+  const m = new Map<number | null, number[]>();
+  for (const r of rows) {
+    const p = r.parent_id;
+    const list = m.get(p);
+    if (list) list.push(r.id);
+    else m.set(p, [r.id]);
+  }
+  return m;
+}
+
+function collectDescendantIds(startId: number, childrenByParent: Map<number | null, number[]>): number[] {
+  const out: number[] = [];
+  const stack = [...(childrenByParent.get(startId) ?? [])];
+  while (stack.length) {
+    const id = stack.pop()!;
+    out.push(id);
+    const kids = childrenByParent.get(id);
+    if (kids) for (const k of kids) stack.push(k);
+  }
+  return out;
+}
+
+export function decodeTreeTagRef(database: Database, stored: string): string | null {
+  const m = stored.trim().match(TAG_REF_RE);
+  if (!m) return null;
+  const id = Number.parseInt(m[1], 16);
+  if (!Number.isFinite(id) || id < 1) return null;
+  const row = database.query(`SELECT name FROM tag_tree_nodes WHERE id = ?`).get(id) as { name: string } | undefined;
+  return row?.name ?? null;
+}
+
+/** Anzeige-Label für einen in der DB gespeicherten Tag-Namen (refs → Baumname). */
+export function decodeSnippetTagDisplay(database: Database, stored: string): string {
+  return decodeTreeTagRef(database, stored) ?? stored;
+}
+
+/** Speicherform: bekannte Baum-Namen → `#[tag:hexId]`, sonst unverändert; gültige Refs werden normalisiert. */
+export function encodeTreeTagStorage(database: Database, input: string): string {
+  const t = input.trim();
+  if (!t) return t;
+  const ref = t.match(TAG_REF_RE);
+  if (ref) {
+    const id = Number.parseInt(ref[1], 16);
+    if (!Number.isFinite(id) || id < 1) return t;
+    const row = database.query(`SELECT id FROM tag_tree_nodes WHERE id = ?`).get(id) as { id: number } | undefined;
+    if (row) return `#[tag:${row.id.toString(16)}]`;
+    return t;
+  }
+  const row2 = database.query(`SELECT id FROM tag_tree_nodes WHERE name = ? COLLATE NOCASE`).get(t) as
+    | { id: number }
+    | undefined;
+  if (row2) return `#[tag:${row2.id.toString(16)}]`;
+  return t;
+}
+
+/** Kanonische Ref-Strings für Baumknoten mit diesen Anzeigenamen (für Suche auf encodierten Snippet-Tags). */
+export function treeStorageRefsForDisplayNames(database: Database, displayNames: string[]): string[] {
+  const out: string[] = [];
+  const seen = new Set<string>();
+  for (const n of displayNames) {
+    const row = database.query(`SELECT id FROM tag_tree_nodes WHERE name = ? COLLATE NOCASE`).get(n.trim()) as
+      | { id: number }
+      | undefined;
+    if (!row) continue;
+    const s = `#[tag:${row.id.toString(16)}]`;
+    if (!seen.has(s)) {
+      seen.add(s);
+      out.push(s);
+    }
+  }
+  return out;
+}
+
+/** Vorschläge nur aus dem Tag-Baum; `name` wird eingefügt, `display` für die Liste. */
+export function suggestTagTreeItems(database: Database, qRaw: string, limit = 48): TagTreeSuggestion[] {
+  const q = qRaw.trim().toLowerCase();
+  const out: TagTreeSuggestion[] = [];
+  for (const n of loadNodeRows(database)) {
+    const display = formatTreeTagDisplay(n.name, n.label_prefix);
+    if (q === "") {
+      out.push({ name: n.name, display });
+    } else if (
+      n.name.toLowerCase().includes(q) ||
+      display.toLowerCase().includes(q) ||
+      (n.label_prefix?.toLowerCase().includes(q) ?? false)
+    ) {
+      out.push({ name: n.name, display });
+    }
+  }
+  return out.sort((a, b) => a.display.localeCompare(b.display, undefined, { sensitivity: "base" })).slice(0, limit);
+}
+
+/** Wenn ein Knoten mit exakt diesem Namen existiert: Namen dieses Knotens plus aller Nachfahren (Snippet-Tags sind freitext, gleich Knotenname). */
+export function expandExactTreeTagNames(database: Database, rawName: string): string[] | null {
+  const trimmed = rawName.trim();
+  if (!trimmed) return null;
+  const fromRef = decodeTreeTagRef(database, trimmed);
+  const lookupName = fromRef ?? trimmed;
+  const row = database
+    .query(`SELECT id FROM tag_tree_nodes WHERE name = ? COLLATE NOCASE`)
+    .get(lookupName) as { id: number } | undefined;
+  if (!row) return null;
+  const rows = loadNodeRows(database);
+  const byId = new Map(rows.map(r => [r.id, r]));
+  const children = buildChildrenMap(rows);
+  const ids = [row.id, ...collectDescendantIds(row.id, children)];
+  const names = [...new Set(ids.map(id => byId.get(id)?.name).filter((n): n is string => Boolean(n)))];
+  return names;
+}
+
+/** Für Freitextsuche: alle Knotennamen, die LIKE matchen, plus Namen aller ihrer Nachfahren. */
+export function matchingTreeTagNamesForLikePattern(database: Database, likePatternEscaped: string): string[] {
+  const rows = loadNodeRows(database);
+  if (rows.length === 0) return [];
+  const matched = database
+    .query(
+      `SELECT id FROM tag_tree_nodes
+       WHERE name LIKE '%' || ? || '%' ESCAPE '\\'
+          OR IFNULL(label_prefix, '') LIKE '%' || ? || '%' ESCAPE '\\'`,
+    )
+    .all(likePatternEscaped, likePatternEscaped) as { id: number }[];
+  if (matched.length === 0) return [];
+  const children = buildChildrenMap(rows);
+  const byId = new Map(rows.map(r => [r.id, r]));
+  const nameSet = new Set<string>();
+  for (const { id } of matched) {
+    nameSet.add(byId.get(id)!.name);
+    for (const did of collectDescendantIds(id, children)) {
+      const n = byId.get(did)?.name;
+      if (n) nameSet.add(n);
+    }
+  }
+  return [...nameSet];
+}
+
+export function listTagTreeNodes(): TagTreeNode[] {
+  const database = getDb();
+  return loadNodeRows(database).map(r => ({
+    id: r.id,
+    name: r.name,
+    label_prefix: r.label_prefix,
+    parent_id: r.parent_id,
+    color: r.color,
+  }));
+}
+
+const HEX_COLOR = /^#[0-9A-Fa-f]{6}$/;
+
+function normalizeColor(v: unknown): string | null {
+  if (v === null || v === undefined) return null;
+  if (typeof v !== "string") return null;
+  const s = v.trim();
+  if (s === "") return null;
+  if (!HEX_COLOR.test(s)) return null;
+  return s.toLowerCase();
+}
+
+function normalizeLabelPrefix(v: unknown): string | null {
+  if (v === null || v === undefined) return null;
+  if (typeof v !== "string") return null;
+  const s = v.trim();
+  return s === "" ? null : s;
+}
+
+function wouldCreateCycle(database: Database, nodeId: number, newParentId: number | null): boolean {
+  if (newParentId === null) return false;
+  let cur: number | null = newParentId;
+  const seen = new Set<number>();
+  while (cur !== null) {
+    if (cur === nodeId) return true;
+    if (seen.has(cur)) return true;
+    seen.add(cur);
+    const row = database.query(`SELECT parent_id FROM tag_tree_nodes WHERE id = ?`).get(cur) as
+      | { parent_id: number | null }
+      | undefined;
+    cur = row?.parent_id ?? null;
+  }
+  return false;
+}
+
+export function createTagTreeNode(input: {
+  name: string;
+  parent_id?: number | null;
+  color?: string | null;
+  label_prefix?: string | null;
+}): TagTreeNode {
+  const database = getDb();
+  const name = String(input.name).trim();
+  if (!name) {
+    throw new Error("Name fehlt");
+  }
+  const parent_id =
+    input.parent_id === undefined || input.parent_id === null
+      ? null
+      : Number(input.parent_id);
+  if (parent_id !== null && !Number.isFinite(parent_id)) {
+    throw new Error("Ungültige parent_id");
+  }
+  if (parent_id !== null) {
+    const p = database.query(`SELECT id FROM tag_tree_nodes WHERE id = ?`).get(parent_id) as { id: number } | undefined;
+    if (!p) throw new Error("Parent nicht gefunden");
+  }
+  const color = normalizeColor(input.color);
+  const label_prefix = normalizeLabelPrefix(input.label_prefix);
+  database.run(`INSERT INTO tag_tree_nodes (name, parent_id, color, label_prefix) VALUES (?, ?, ?, ?)`, [
+    name,
+    parent_id,
+    color,
+    label_prefix,
+  ]);
+  const idRow = database.query(`SELECT last_insert_rowid() AS id`).get() as { id: number };
+  const id = Number(idRow.id);
+  const row = database
+    .query(`SELECT id, name, parent_id, color, label_prefix FROM tag_tree_nodes WHERE id = ?`)
+    .get(id) as NodeRow;
+  return {
+    id: row.id,
+    name: row.name,
+    label_prefix: row.label_prefix,
+    parent_id: row.parent_id,
+    color: row.color,
+  };
+}
+
+export function updateTagTreeNode(
+  id: number,
+  input: { name?: string; parent_id?: number | null; color?: string | null; label_prefix?: string | null },
+): TagTreeNode | null {
+  const database = getDb();
+  const existing = database
+    .query(`SELECT id, name, parent_id, color, label_prefix FROM tag_tree_nodes WHERE id = ?`)
+    .get(id) as NodeRow | undefined;
+  if (!existing) return null;
+
+  let name = existing.name;
+  if (input.name !== undefined) {
+    const n = String(input.name).trim();
+    if (!n) throw new Error("Name fehlt");
+    name = n;
+  }
+
+  let parent_id = existing.parent_id;
+  if ("parent_id" in input) {
+    parent_id = input.parent_id === null || input.parent_id === undefined ? null : Number(input.parent_id);
+    if (parent_id !== null && !Number.isFinite(parent_id)) {
+      throw new Error("Ungültige parent_id");
+    }
+    if (parent_id !== null) {
+      const p = database.query(`SELECT id FROM tag_tree_nodes WHERE id = ?`).get(parent_id) as { id: number } | undefined;
+      if (!p) throw new Error("Parent nicht gefunden");
+      if (parent_id === id) throw new Error("Knoten kann nicht eigener Parent sein");
+    }
+    if (wouldCreateCycle(database, id, parent_id)) {
+      throw new Error("Zyklus im Baum nicht erlaubt");
+    }
+  }
+
+  let color = existing.color;
+  if ("color" in input) {
+    color = normalizeColor(input.color);
+  }
+
+  let label_prefix = existing.label_prefix;
+  if ("label_prefix" in input) {
+    label_prefix = normalizeLabelPrefix(input.label_prefix);
+  }
+
+  database.run(`UPDATE tag_tree_nodes SET name = ?, parent_id = ?, color = ?, label_prefix = ? WHERE id = ?`, [
+    name,
+    parent_id,
+    color,
+    label_prefix,
+    id,
+  ]);
+  const row = database.query(`SELECT id, name, parent_id, color, label_prefix FROM tag_tree_nodes WHERE id = ?`).get(id) as NodeRow;
+  return {
+    id: row.id,
+    name: row.name,
+    label_prefix: row.label_prefix,
+    parent_id: row.parent_id,
+    color: row.color,
+  };
+}
+
+export function deleteTagTreeNode(id: number): boolean {
+  const database = getDb();
+  const res = database.run(`DELETE FROM tag_tree_nodes WHERE id = ?`, [id]);
+  return res.changes > 0;
+}
+
+export function colorsForTagNames(database: Database, tagNames: string[]): Map<string, string | null> {
+  const out = new Map<string, string | null>();
+  if (tagNames.length === 0) return out;
+  const unique = [...new Set(tagNames.map(t => t.trim()).filter(Boolean))];
+  const lower = unique.map(s => s.toLowerCase());
+  const placeholders = lower.map(() => "?").join(", ");
+  const rows = database
+    .query(`SELECT name, color FROM tag_tree_nodes WHERE lower(name) IN (${placeholders})`)
+    .all(...lower) as { name: string; color: string | null }[];
+  for (const t of tagNames) {
+    const row = rows.find(r => r.name.toLowerCase() === t.toLowerCase());
+    if (row) out.set(t, row.color);
+  }
+  return out;
+}
+
+export { escapeLike };

src/types/snippet.ts

@@ -5,5 +5,10 @@ export type Snippet = {
   sort_order: number;
   created_at: string;
   updated_at: string;
+  /** Kalendertag `YYYY-MM-DD` oder `null` = keine Deadline / erledigt. */
+  deadline_at: string | null;
   tags: string[];
+  /** Anzeige pro Tag (Prefix + Name für Baum-Tags), gleiche Reihenfolge wie `tags`. */
+  tag_display: string[];
+  tag_colors: Record<string, string | null>;
 };

src/types/tagTree.ts

@@ -0,0 +1,13 @@
+export type TagTreeNode = {
+  id: number;
+  name: string;
+  /** Optional z. B. "Projekt:" → Darstellung "Projekt: sp-migrator", Referenz / Intellisense bleibt `name`. */
+  label_prefix: string | null;
+  parent_id: number | null;
+  color: string | null;
+};
+
+export type TagTreeSuggestion = {
+  name: string;
+  display: string;
+};