UI polish pass: word count, slash commands, task lists, graph peek, bulk delete, export

- WordCount component (toggle words/chars vs read time, persisted mode)
- TipTap: TaskList/TaskItem extensions, slash command menu (H1-H3, lists, code, quote, task)
- Markdown serializer: task list → `- [ ]` / `- [x]` roundtrip
- GraphView: slide-in peek panel for note/task nodes (body, tags, linked nodes); tag nodes still navigate
- ChatView: bulk-select conversations with two-click confirm delete + chat retention policy (default 90d)
- NoteEditorView: pill tab bar with animated edit/preview toggle + WordCount in toolbar
- WorkspaceNoteEditor: inline search with tag matching, inline new-note creation, WordCount
- WorkspaceTaskPanel: task body rendered in slide-over + Edit link
- Settings: data export (Markdown ZIP / JSON) via GET /api/export
- Accessibility: skip-to-content link, aria-labels on all icon-only buttons
- Fix: export route used non-existent fabledassistant.database — corrected to async_session()
- Fix: ToolCallRecord.status type now includes "running" (was causing TS build error)
- Dockerfile: upgrade npm to latest before install to suppress major-version notice
- npm audit fix: patched minimatch (ReDoS) and rollup (path traversal) — 0 vulnerabilities

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

frontend/src/stores/chat.ts

@@ -115,6 +115,17 @@ export const useChatStore = defineStore("chat", () => {
     }
   }
 
+  async function bulkDeleteConversations(ids: number[]) {
+    if (!ids.length) return;
+    await apiPost("/api/chat/conversations/bulk-delete", { ids });
+    const idSet = new Set(ids);
+    conversations.value = conversations.value.filter((c) => !idSet.has(c.id));
+    if (currentConversation.value && idSet.has(currentConversation.value.id)) {
+      currentConversation.value = null;
+    }
+    for (const id of ids) delete convStreams.value[id];
+  }
+
   async function deleteConversation(id: number) {
     try {
       await apiDelete(`/api/chat/conversations/${id}`);
@@ -494,6 +505,7 @@ export const useChatStore = defineStore("chat", () => {
     createConversation,
     fetchConversation,
     deleteConversation,
+    bulkDeleteConversations,
     updateTitle,
     sendMessage,
     reconnectIfGenerating,