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/llm.py

@@ -324,23 +324,27 @@ async def build_context(
     tool_lines = [
         "You have access to tool functions. You MUST use them when the user asks you to create, add, find, schedule, or search for anything.",
         "CRITICAL: Call the tool functions directly. NEVER write out function calls as text or code. NEVER describe what you would do — just do it.",
-        "Available actions: create_task, create_note, update_note, list_tasks, search_notes.",
+        "Available actions: create_task, create_note, update_note, delete_note, delete_task, get_note, list_notes, list_tasks, search_notes.",
     ]
     if has_caldav:
         tool_lines[-1] = (
-            "Available actions: create_task, create_note, update_note, list_tasks, search_notes, "
+            "Available actions: create_task, create_note, update_note, delete_note, delete_task, get_note, list_notes, list_tasks, search_notes, "
             "create_event, list_events, search_events, update_event, delete_event, "
-            "list_calendars, create_todo, list_todos, update_todo, complete_todo, delete_todo."
+            "list_calendars, create_todo, list_todos, search_todos, update_todo, complete_todo, delete_todo."
         )
         tool_lines.append("For calendar events, use ISO 8601 datetime format (e.g. 2026-09-30T00:00:00).")
         tool_lines.append("CalDAV todos are separate from app tasks. Use create_task for app tasks, create_todo for CalDAV todos.")
         tool_lines.append("When the user says 'remind me' with a time before an event, use the reminder_minutes parameter.")
+        tool_lines.append("Use search_todos to find a specific CalDAV todo by keyword when list_todos would return too many results.")
     tool_lines.append("For relative dates like 'Friday' or 'next week', resolve them to YYYY-MM-DD format.")
     tool_lines.append(
         "Use update_note to edit/expand an existing note OR to update a task's status/priority/due_date. "
         "Use create_note ONLY for genuinely new notes with a different title. "
         "Use list_tasks to find tasks by status, priority, or due date (e.g. overdue, high priority, in progress). "
-        "If a note was created earlier in the conversation and the user provides more content for it, use update_note."
+        "If a note was created earlier in the conversation and the user provides more content for it, use update_note. "
+        "Use get_note to read the full content of a specific note. "
+        "Use list_notes to browse notes by recency or tag. "
+        "Use delete_note / delete_task only when explicitly asked to delete — these require confirmation."
     )
     tool_guidance = "\n".join(tool_lines)