refactor(ui): Phase 7 — strip chat/voice/journal/workspace/home surfaces

Frontend deletion phase of the MCP-first pivot. All in-app
conversational surfaces are gone — Claude/MCP is the assistant now.

Deleted views:
  ChatView, JournalView, WorkspaceView, HomeView

Deleted components:
  ChatPanel, ChatInputBar, ChatMessage, ChatStreamingBubble,
  ToolCallCard, ToolConfirmCard, WorkspaceChatWidget

Deleted composables + store:
  useVoiceRecorder, useVoiceAudio, useStreamingTts, stores/chat

Router changes:
  - / now redirects to /knowledge (was /journal)
  - dropped /chat, /chat/:id, /journal, /workspace/:projectId
  - /tasks still redirects to / (→ /knowledge)
  - /notes still redirects to /knowledge

KnowledgeView:
  - removed ChatPanel + ChatInputBar embeds
  - removed minichat floating widget + state + handlers
  - removed Chat link from today bar
  - removed `chatStore` driven auto-refresh-on-tool-call watch

App.vue:
  - removed useChatStore + startStatusPolling/stopStatusPolling
  - removed VAD ONNX preloader (voice subsystem dead)
  - removed visibilitychange listener (only did voice status re-check)
  - removed `c` single-key shortcut (focus chat / goto chat)
  - removed `g+c` two-key sequence (goto chat)
  - removed Chat section from shortcuts overlay
  - removed `.chat-page` / `.workspace-root` CSS overflow rule

AppHeader.vue:
  - removed useChatStore + status indicator (Ollama model status)
  - removed Chat / Journal nav links (desktop + mobile)

SettingsView.vue (4598 → 4079 lines):
  - removed Voice tab entirely
  - Notifications tab: dropped Push Notifications + Chat History
    + About sections (kept Email Notifications)
  - General tab: dropped Assistant (name + model pickers) +
    Model Management sections (kept Tasks + Timezone)
  - Profile tab: dropped Journal + Observations sections
  - VALID_TABS + tab list array no longer include "voice"
  - removed `loadVoiceTab()` activation trigger

Service worker (frontend/public/sw.js):
  - dropped push and notificationclick handlers (push subsystem
    only fired on internal generation completion, which is gone)
  - kept empty fetch handler as PWA installability shell

Script-level dead code (state refs, helper functions referencing
removed APIs) remains in SettingsView and stores/push.ts and
stores/settings.ts for now — Phase 8 backend deletion will clean
those up alongside the matching backend route removals.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

frontend/public/sw.js

@@ -1,45 +1,11 @@
-// Service Worker for push notifications and PWA support
-self.addEventListener('push', event => {
-  if (!event.data) return;
-  const data = event.data.json();
-  const notifUrl = data.url || '/';
+// Service Worker — PWA installability shell only.
+//
+// The push and notificationclick listeners were removed alongside the chat
+// generation pipeline (they only fired when the internal LLM finished a
+// response). The empty fetch handler is preserved as the installability
+// surface required for "Add to Home Screen" in some browsers; offline
+// caching is intentionally not implemented yet.
 
-  event.waitUntil(
-    clients.matchAll({ type: 'window', includeUncontrolled: true }).then(clientList => {
-      // Suppress notification if the user already has the relevant page focused
-      for (const client of clientList) {
-        if (client.visibilityState === 'visible' && client.url.includes(notifUrl)) {
-          return;
-        }
-      }
-      return self.registration.showNotification(data.title || 'Scribe', {
-        body: data.body || '',
-        icon: '/favicon.ico',
-        badge: '/favicon.ico',
-        data: { url: notifUrl },
-      });
-    })
-  );
-});
-
-self.addEventListener('notificationclick', event => {
-  event.notification.close();
-  event.waitUntil(
-    clients.matchAll({ type: 'window', includeUncontrolled: true }).then(clientList => {
-      const url = event.notification.data.url;
-      for (const client of clientList) {
-        if (client.url.includes(url) && 'focus' in client) {
-          return client.focus();
-        }
-      }
-      if (clients.openWindow) {
-        return clients.openWindow(url);
-      }
-    })
-  );
-});
-
-// PWA: serve cached assets for offline support (minimal)
-self.addEventListener('fetch', event => {
+self.addEventListener('fetch', () => {
   // Pass-through — no offline caching in v1
 });