feat(projects): editable notes with edit stamp + NoteCard bubble component

- author-only note editing (PUT /projects/:id/notes/:noteId, strict schema,
  audit with old/new content); edits stamped via new edited_at column
  (migration 20260612160000) and shown as '· upraveno <datum>'
- note deletion tightened to admin-only server-side (was any projects.edit
  holder via direct API)
- new NoteCard component: chat-bubble note row (initials avatar, wrapping
  header, inline editor, actions in the bubble corner so they don't squeeze
  content on mobile), table-matching edit/delete icons
- Odin project detail carries the edited_at stamp; route-level tests cover
  author-edit, foreign-edit 403, validation, admin-only delete

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

src/routes/admin/projects.ts

@@ -9,6 +9,7 @@ import {
   UpdateProjectSchema,
   CreateProjectSchema,
   CreateProjectNoteSchema,
+  UpdateProjectNoteSchema,
 } from "../../schemas/projects.schema";
 import {
   listProjects,
@@ -19,6 +20,7 @@ import {
   deleteProject,
   createProjectNote,
   deleteProjectNote,
+  updateProjectNote,
 } from "../../services/projects.service";
 
 // Body for DELETE /:id — optional delete_files flag. The body may be absent on
@@ -174,7 +176,47 @@ export default async function projectsRoutes(
     },
   );
 
-  // DELETE /api/admin/projects/:id/notes/:noteId
+  // PUT /api/admin/projects/:id/notes/:noteId — author-only edit; the edit
+  // is visibly stamped (edited_at) so a changed note can't pose as original.
+  fastify.put<{ Params: { id: string; noteId: string } }>(
+    "/:id/notes/:noteId",
+    { preHandler: requirePermission("projects.edit") },
+    async (request, reply) => {
+      const noteId = parseId(request.params.noteId, reply);
+      if (noteId === null) return;
+      const projectId = parseId(request.params.id, reply);
+      if (projectId === null) return;
+      const parsed = parseBody(UpdateProjectNoteSchema, request.body);
+      if ("error" in parsed) return error(reply, parsed.error, 400);
+      const authData = request.authData!;
+
+      const result = await updateProjectNote(
+        projectId,
+        noteId,
+        authData.userId,
+        parsed.data.content,
+      );
+      if (!result) return error(reply, "Poznámka nenalezena", 404);
+      if (result.error !== undefined) {
+        return error(reply, result.error, result.status ?? 403);
+      }
+
+      await logAudit({
+        request,
+        authData,
+        action: "update",
+        entityType: "project",
+        entityId: projectId,
+        description: `Upravena poznámka projektu`,
+        oldValues: { content: result.previousContent },
+        newValues: { content: result.note.content },
+      });
+      return success(reply, { note: result.note }, 200, "Poznámka upravena");
+    },
+  );
+
+  // DELETE /api/admin/projects/:id/notes/:noteId — admin only (user
+  // decision: authors edit their notes, only an admin removes anyone's).
   fastify.delete<{ Params: { id: string; noteId: string } }>(
     "/:id/notes/:noteId",
     { preHandler: requirePermission("projects.edit") },
@@ -183,6 +225,9 @@ export default async function projectsRoutes(
       if (noteId === null) return;
       const projectId = parseId(request.params.id, reply);
       if (projectId === null) return;
+      if (request.authData!.roleName !== "admin") {
+        return error(reply, "Poznámky může mazat pouze administrátor", 403);
+      }
 
       const note = await deleteProjectNote(projectId, noteId);
       if (!note) return error(reply, "Poznámka nenalezena", 404);