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/stores/settings.ts

@@ -1,13 +1,12 @@
 import { ref, computed } from "vue";
 import { defineStore } from "pinia";
-import { apiGet, apiPut, apiPost, apiStreamPost } from "@/api/client";
+import { apiGet, apiPut } from "@/api/client";
 import { useToastStore } from "@/stores/toast";
 import type { AppSettings } from "@/types/settings";
 
 export const useSettingsStore = defineStore("settings", () => {
   const settings = ref<AppSettings>({});
   const loading = ref(false);
-  const installedModels = ref<string[]>([]);
 
   const assistantName = computed(
     () => settings.value.assistant_name || "Fable"
@@ -40,44 +39,12 @@ export const useSettingsStore = defineStore("settings", () => {
     }
   }
 
-  async function fetchInstalledModels() {
-    try {
-      const data = await apiGet<{ models: { name: string }[] }>("/api/chat/models");
-      installedModels.value = data.models.map((m) => m.name);
-    } catch {
-      installedModels.value = [];
-    }
-  }
-
-  async function pullModel(
-    model: string,
-    onProgress?: (data: Record<string, unknown>) => void,
-  ) {
-    await apiStreamPost("/api/chat/models/pull", { model }, (data) => {
-      if (onProgress) onProgress(data);
-    });
-  }
-
-  async function deleteModel(model: string) {
-    try {
-      await apiPost("/api/chat/models/delete", { model });
-      await fetchInstalledModels();
-    } catch (e) {
-      useToastStore().show("Failed to delete model", "error");
-      throw e;
-    }
-  }
-
   return {
     settings,
     loading,
-    installedModels,
     assistantName,
     defaultModel,
     fetchSettings,
     updateSettings,
-    fetchInstalledModels,
-    pullModel,
-    deleteModel,
   };
 });