Add CalDAV calendar integration, LLM-suggested tags, and settings refinements

- CalDAV integration: per-user calendar config, create/list/search events
  via caldav library, LLM tools for calendar operations from chat
- LLM-suggested tags: new tag_suggestions service prompts LLM with existing
  tags and note content to suggest 3-5 relevant tags; exposed via API
  endpoints (suggest-tags, append-tag); integrated into editor views
  (suggest button + clickable pills) and chat tool calls (pills in
  ToolCallCard with one-click apply)
- Settings/model UI refinements, generation task improvements

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

frontend/src/types/chat.ts

@@ -1,7 +1,7 @@
 export interface ToolCallRecord {
   function: string;
   arguments: Record<string, unknown>;
-  result: { success: boolean; type?: string; data?: Record<string, unknown>; error?: string };
+  result: { success: boolean; type?: string; data?: Record<string, unknown>; error?: string; suggested_tags?: string[] };
   status: "success" | "error";
 }
 
@@ -34,18 +34,6 @@ export interface ConversationDetail extends Conversation {
   messages: Message[];
 }
 
-export interface OllamaModel {
-  name: string;
-  size: number;
-}
-
-export interface RunningModel {
-  name: string;
-  size: number;
-  size_vram: number;
-  expires_at: string;
-}
-
 export interface ContextMeta {
   context_note_id: number | null;
   context_note_title: string | null;

frontend/src/types/settings.ts

@@ -3,11 +3,3 @@ export interface AppSettings {
   default_model?: string;
   [key: string]: string | undefined;
 }
-
-export interface ModelInfo {
-  name: string;
-  description: string;
-  size: string;
-  bestFor: string;
-  category: string;
-}