Phase 10: CalDAV full lifecycle, update_note, dashboard inline streaming, keyboard shortcuts

Backend:
- caldav.py: Full event lifecycle — update_event, delete_event; VTODO suite —
  create_todo, list_todos, complete_todo, delete_todo; list_calendars; timezone
  support via ZoneInfo; reminders via VALARM; attendees; multi-calendar search
  (_get_all_calendars scans all calendars when no specific one is configured)
- tools.py: New update_note tool (find by title + replace/append modes),
  7 new CalDAV tool definitions, corresponding execute_tool cases
- llm.py: Update system prompt — add update_note guidance, full CalDAV action list
- intent.py: Confidence scoring (high/medium/low) + should_execute property;
  conversation history support for anaphora resolution; routing rules for
  update/delete events, todos, update_note vs create_note disambiguation,
  time-period → list_events (not search_events), reminder_minutes conversion
- generation_task.py: Parallel fetch of tools + intent_model setting; dedicated
  intent model (OLLAMA_INTENT_MODEL env var or per-user intent_model setting)
- config.py: Add OLLAMA_INTENT_MODEL env var

Frontend:
- HomeView.vue: Inline streaming response (no navigation); quick action chips;
  isConversational computed — prominent "Continue this conversation" CTA when
  no tool calls; auto-focus chat input on mount via chatInputRef
- DashboardChatInput.vue: defineExpose({ focus }) for external focus control
- ChatView.vue: Escape key handler — close picker → close sidebar → clear
  textarea → navigate home; onUnmounted cleanup
- App.vue: Global ? key shortcut toggles keyboard shortcuts overlay; shared
  state via useShortcuts composable; Transition animation
- AppHeader.vue: ? button for shortcuts overlay discoverability
- useShortcuts.ts (new): Shared showShortcuts ref + open/close/toggle helpers
- ToolCallCard.vue: note_updated, event_updated, event_deleted, calendars,
  todo, todos, todo_completed, todo_deleted label cases + render blocks
- SettingsView.vue: Intent model field + caldav_timezone setting

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

frontend/src/components/AppHeader.vue

@@ -2,11 +2,13 @@
 import { ref, computed } from "vue";
 import { useRouter } 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";
 
 const { theme, toggleTheme } = useTheme();
+const { toggleShortcuts } = useShortcuts();
 const authStore = useAuthStore();
 const chatStore = useChatStore();
 const router = useRouter();
@@ -66,6 +68,9 @@ router.afterEach(() => {
         <span class="status-indicator" :class="statusClass" :title="statusLabel">
           <span class="status-dot"></span>
         </span>
+        <button class="btn-shortcuts" @click="toggleShortcuts" title="Keyboard shortcuts (?)">
+          ?
+        </button>
         <button class="theme-toggle" @click="toggleTheme" :title="`Switch to ${theme === 'dark' ? 'light' : 'dark'} mode`">
           {{ theme === "dark" ? "\u2600" : "\u263E" }}
         </button>
@@ -164,6 +169,21 @@ router.afterEach(() => {
   0%, 100% { opacity: 1; }
   50% { opacity: 0.4; }
 }
+.btn-shortcuts {
+  background: none;
+  border: 1px solid var(--color-border);
+  border-radius: var(--radius-sm);
+  padding: 0.25rem 0.55rem;
+  cursor: pointer;
+  font-size: 0.9rem;
+  font-weight: 700;
+  color: var(--color-text-muted);
+  line-height: 1;
+}
+.btn-shortcuts:hover {
+  background: var(--color-bg-card);
+  color: var(--color-text);
+}
 .theme-toggle {
   background: none;
   border: 1px solid var(--color-border);