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/views/TaskEditorView.vue

@@ -15,6 +15,7 @@ import type { TaskStatus, TaskPriority } from "@/types/task";
 import type { Editor } from "@tiptap/vue-3";
 import MarkdownToolbar from "@/components/MarkdownToolbar.vue";
 import TiptapEditor from "@/components/TiptapEditor.vue";
+import WordCount from "@/components/WordCount.vue";
 import TagInput from "@/components/TagInput.vue";
 import ProjectSelector from "@/components/ProjectSelector.vue";
 import MilestoneSelector from "@/components/MilestoneSelector.vue";
@@ -388,6 +389,7 @@ useEditorGuards(dirty, save);
         <button class="btn-assist-toggle" :class="{ active: assistOpen }" @click="toggleAssist">
           ✨ Assist
         </button>
+        <WordCount :body="body" />
       </div>
       <input
         v-model="title"
@@ -579,7 +581,7 @@ useEditorGuards(dirty, save);
                 #{{ tag }}
                 <span v-if="appliedTags.has(tag)" class="tag-check">&#10003;</span>
               </button>
-              <button class="btn-dismiss-tags" @click="dismissTagSuggestions">&times;</button>
+              <button class="btn-dismiss-tags" aria-label="Dismiss tag suggestions" @click="dismissTagSuggestions">&times;</button>
             </template>
           </div>
 
@@ -591,7 +593,7 @@ useEditorGuards(dirty, save);
         <div class="assist-panel-header">
           <span class="assist-panel-title">✨ AI Assist</span>
           <button class="btn-proofread" @click="assist.proofread()" :disabled="assist.state.value === 'streaming'">Proofread</button>
-          <button class="btn-close-assist" @click="toggleAssist">×</button>
+          <button class="btn-close-assist" aria-label="Close assist panel" @click="toggleAssist">×</button>
         </div>
         <div class="assist-panel-body">
           <div v-if="assist.state.value === 'idle'" class="assist-idle">