Add persistent context sidebar, note title fix, and expanded tool suite

Context sidebar + note title:
- ChatView: replace ephemeral context pills with a persistent right-panel sidebar;
  auto-found notes accumulate across turns; attached note shows with pin icon;
  × button excludes a note from future auto-search; hidden on mobile
- routes/chat.py: batch-fetch note titles via get_notes_by_ids() and inject
  context_note_title into each message dict at conversation load time
- notes.py: add get_notes_by_ids() batch fetch helper
- types/chat.ts: add context_note_title field to Message interface
- stores/chat.ts: sendMessage accepts optional 5th arg contextNoteTitle,
  included in optimistic user message
- ChatMessage.vue: context badge shows note title instead of 'Note #N'

Expanded LLM tool suite (all with intent router rules + ToolCallCard display):
- delete_note / delete_task: permanent delete with user confirmation (write tool),
  type-safe (refuse to delete wrong type), clears note context cache on success
- get_note: fetch full note body by query (search_notes returns only 200-char preview)
- list_notes: browse notes by recency/keyword/tags with limit; notes only
- update_note: add tags + tag_mode (replace/add/remove) parameters
- search_notes: add optional type filter ("note" | "task")
- search_todos (CalDAV): keyword-filter todos, companion to list_todos
- caldav.py: add search_todos() built on top of list_todos()
- generation_task.py: register new tools in _WRITE_TOOLS, _TOOL_LABELS, _TOOL_ACTIONS
- llm.py: update available actions list and guidance in system prompt
- intent.py: routing rules for all new tools

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

src/fabledassistant/services/generation_task.py

@@ -41,6 +41,10 @@ _TOOL_LABELS: dict[str, str] = {
     "create_task": "Creating task",
     "create_note": "Creating note",
     "update_note": "Updating note",
+    "delete_note": "Deleting note",
+    "delete_task": "Deleting task",
+    "get_note": "Reading note",
+    "list_notes": "Listing notes",
     "list_tasks": "Searching tasks",
     "search_notes": "Searching notes",
     "create_event": "Creating calendar event",
@@ -51,6 +55,7 @@ _TOOL_LABELS: dict[str, str] = {
     "list_calendars": "Listing calendars",
     "create_todo": "Creating todo",
     "list_todos": "Listing todos",
+    "search_todos": "Searching todos",
     "update_todo": "Updating todo",
     "complete_todo": "Completing todo",
     "delete_todo": "Removing todo",
@@ -58,7 +63,7 @@ _TOOL_LABELS: dict[str, str] = {
 
 # Tools that write data and require explicit user confirmation before executing.
 _WRITE_TOOLS: frozenset[str] = frozenset({
-    "create_task", "create_note", "update_note",
+    "create_task", "create_note", "update_note", "delete_note", "delete_task",
     "create_event", "update_event", "delete_event",
     "create_todo", "update_todo", "complete_todo", "delete_todo",
 })
@@ -68,8 +73,13 @@ _TOOL_ACTIONS: dict[str, str] = {
     "create_task": "create a task",
     "create_note": "create a new note",
     "update_note": "update an existing note",
+    "delete_note": "permanently delete a note",
+    "delete_task": "permanently delete a task",
+    "get_note": "read a note",
+    "list_notes": "list notes",
     "list_tasks": "look up tasks",
     "search_notes": "search through notes",
+    "search_todos": "search calendar todos",
     "create_event": "schedule a calendar event",
     "list_events": "check the calendar",
     "search_events": "search calendar events",
@@ -351,7 +361,7 @@ async def run_generation(
 
                         # Invalidate the note context cache after any successful note write
                         # so the next turn can pick up newly created/modified notes.
-                        if result.get("success") and tool_name in {"create_task", "create_note", "update_note"}:
+                        if result.get("success") and tool_name in {"create_task", "create_note", "update_note", "delete_note", "delete_task"}:
                             clear_conv_note_cache(conv_id)
 
                         tool_record = {
@@ -422,7 +432,7 @@ async def run_generation(
                         timing["tools"].append({"name": tool_name, "ms": int((time.monotonic() - t_tool) * 1000)})
                         logger.info("Tool %s result: success=%s", tool_name, result.get("success"))
 
-                        if result.get("success") and tool_name in {"create_task", "create_note", "update_note"}:
+                        if result.get("success") and tool_name in {"create_task", "create_note", "update_note", "delete_note", "delete_task"}:
                             clear_conv_note_cache(conv_id)
 
                         tool_record = {