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/src/components/AppHeader.vue

@@ -4,7 +4,6 @@ import { useRouter, useRoute } from "vue-router";
 import { useTheme } from "@/composables/useTheme";
 import { useShortcuts } from "@/composables/useShortcuts";
 import { useAuthStore } from "@/stores/auth";
-import { useChatStore } from "@/stores/chat";
 import AppLogo from "@/components/AppLogo.vue";
 import NotificationBell from "@/components/NotificationBell.vue";
 import { Sun, Moon, Settings } from "lucide-vue-next";
@@ -12,42 +11,13 @@ import { Sun, Moon, Settings } from "lucide-vue-next";
 const { theme, toggleTheme } = useTheme();
 const { toggleShortcuts } = useShortcuts();
 const authStore = useAuthStore();
-const chatStore = useChatStore();
 const router = useRouter();
 const route = useRoute();
 
-const isChatActive = computed(() => route.path.startsWith("/chat"))
 const isKnowledgeActive = computed(() => route.path === "/knowledge");
 
 const mobileMenuOpen = ref(false);
 
-const statusShortLabel = computed(() => {
-  if (chatStore.ollamaStatus === "unavailable") return "Offline";
-  if (chatStore.ollamaStatus === "checking") return "Checking";
-  if (chatStore.modelStatus === "not_found") return "No model";
-  if (chatStore.modelStatus === "cold") return "Cold";
-  if (chatStore.modelStatus === "loaded") return "Ready";
-  return "Checking";
-});
-
-const statusLabel = computed(() => {
-  if (chatStore.ollamaStatus === "unavailable") return "Ollama unavailable";
-  if (chatStore.ollamaStatus === "checking") return "Checking...";
-  if (chatStore.modelStatus === "not_found") return "Model not installed";
-  if (chatStore.modelStatus === "cold") return "Model cold — first response may be slow";
-  if (chatStore.modelStatus === "loaded") return "Model loaded · ready";
-  return "Checking...";
-});
-
-const statusClass = computed(() => {
-  if (chatStore.ollamaStatus === "unavailable") return "status-red";
-  if (chatStore.ollamaStatus === "checking") return "status-gray";
-  if (chatStore.modelStatus === "not_found") return "status-orange";
-  if (chatStore.modelStatus === "cold") return "status-yellow";
-  if (chatStore.modelStatus === "loaded") return "status-green";
-  return "status-gray";
-});
-
 function toggleMobileMenu() {
   mobileMenuOpen.value = !mobileMenuOpen.value;
 }
@@ -76,20 +46,13 @@ router.afterEach(() => {
       <div class="nav-center">
         <div class="nav-pill-bar">
           <router-link to="/knowledge" class="nav-link" :class="{ 'router-link-active': isKnowledgeActive }">Knowledge</router-link>
-          <router-link to="/chat" :class="['nav-link', { 'router-link-active': isChatActive }]">Chat</router-link>
-          <router-link to="/journal" class="nav-link">Journal</router-link>
           <router-link to="/calendar" class="nav-link">Calendar</router-link>
           <router-link to="/projects" class="nav-link">Projects</router-link>
         </div>
       </div>
 
-      <!-- Right: status + utilities + gear + user -->
+      <!-- Right: utilities + gear + user -->
       <div class="nav-right">
-        <span class="status-indicator" :class="statusClass" :title="statusLabel">
-          <span class="status-dot"></span>
-          <span class="status-text">{{ statusShortLabel }}</span>
-        </span>
-
         <NotificationBell />
 
         <button class="btn-icon" @click="toggleShortcuts" title="Keyboard shortcuts (?)">?</button>
@@ -122,8 +85,6 @@ router.afterEach(() => {
     <!-- Mobile dropdown -->
     <div v-if="mobileMenuOpen" class="mobile-menu">
       <router-link to="/knowledge" class="nav-link" :class="{ 'router-link-active': isKnowledgeActive }">Knowledge</router-link>
-      <router-link to="/chat" :class="['nav-link', { 'router-link-active': isChatActive }]">Chat</router-link>
-      <router-link to="/journal" class="nav-link">Journal</router-link>
       <router-link to="/calendar" class="nav-link">Calendar</router-link>
       <router-link to="/projects" class="nav-link">Projects</router-link>
       <router-link to="/shared" class="nav-link">Shared</router-link>
@@ -131,10 +92,6 @@ router.afterEach(() => {
       <router-link to="/settings" class="nav-link">Settings</router-link>
       <div class="mobile-divider"></div>
       <div class="mobile-actions">
-        <span class="status-indicator" :class="statusClass" :title="statusLabel">
-          <span class="status-dot"></span>
-          <span class="status-text">{{ statusShortLabel }}</span>
-        </span>
         <button class="btn-icon" @click="toggleShortcuts">?</button>
         <button class="btn-icon" @click="toggleTheme"><Sun v-if="theme === 'dark'" :size="16" />
           <Moon v-else :size="16" /></button>