feat(frontend): NoteVersion pin fields + pin/unpin client helpers

frontend/src/api/client.ts

@@ -716,3 +716,21 @@ import type { Note as Task } from '../types/note'
  *  auto_consolidate_tasks setting. */
 export const consolidateTask = (id: number) =>
   apiPost<Task>(`/api/tasks/${id}/consolidate`, {})
+
+
+// ── Note Versions (pinning) ──────────────────────────────────────────────────
+
+import type { NoteVersion } from '../types/task'
+
+/** Mark a note version as manually pinned, optionally with a commit-note
+ *  label. Re-calling with a different label updates the label. */
+export const pinNoteVersion = (noteId: number, versionId: number, label?: string | null) =>
+  apiPost<NoteVersion>(
+    `/api/notes/${noteId}/versions/${versionId}/pin`,
+    { label: label ?? null },
+  )
+
+/** Downgrade a manually-pinned version back to rolling. Does NOT delete
+ *  the row — older rows may be FIFO-pruned by the next autosave. */
+export const unpinNoteVersion = (noteId: number, versionId: number) =>
+  apiDelete(`/api/notes/${noteId}/versions/${versionId}/pin`)

frontend/src/types/task.ts

@@ -31,5 +31,7 @@ export interface NoteVersion {
   title: string;
   tags: string[];
   body?: string;
+  pin_kind: "auto" | "manual" | null;
+  pin_label: string | null;
   created_at: string;
 }