Add model selection, dashboard chat input, and model warming

- Add GET /api/chat/ps and POST /api/chat/warm endpoints for hot model
  visibility and pre-loading
- Extend PATCH /api/chat/conversations/:id to accept model in addition
  to title
- Add ModelSelector component with hot/cold indicators from Ollama /api/ps
- Add DashboardChatInput component (model selector + note picker + textarea)
  replacing the simple "New Chat" button on the dashboard
- Add model selector dropdown to ChatView header, persisted per-conversation
- Warm default model on dashboard mount via fire-and-forget background task
- Configure Ollama with OLLAMA_MAX_LOADED_MODELS=2 and OLLAMA_KEEP_ALIVE=30m
- Always-visible edit buttons on NoteCard/TaskCard (remove hover-only behavior)

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

frontend/src/stores/chat.ts

@@ -15,6 +15,7 @@ import type {
   Message,
   OllamaModel,
   OllamaStatus,
+  RunningModel,
   SendMessageResponse,
 } from "@/types/chat";
 
@@ -27,6 +28,7 @@ export const useChatStore = defineStore("chat", () => {
   const streamingContent = ref("");
   const lastContextMeta = ref<ContextMeta | null>(null);
   const models = ref<OllamaModel[]>([]);
+  const runningModels = ref<RunningModel[]>([]);
   const ollamaStatus = ref<"checking" | "available" | "unavailable">("checking");
   const modelStatus = ref<"checking" | "ready" | "not_found">("checking");
   const defaultModel = ref("");
@@ -308,6 +310,42 @@ export const useChatStore = defineStore("chat", () => {
     }
   }
 
+  async function fetchRunningModels() {
+    try {
+      const data = await apiGet<{ models: RunningModel[] }>("/api/chat/ps");
+      runningModels.value = data.models;
+    } catch {
+      runningModels.value = [];
+    }
+  }
+
+  async function warmModel(model: string) {
+    try {
+      await apiPost("/api/chat/warm", { model });
+    } catch {
+      // Warming is best-effort
+    }
+  }
+
+  async function updateConversationModel(id: number, model: string) {
+    try {
+      const updated = await apiPatch<Conversation>(
+        `/api/chat/conversations/${id}`,
+        { model }
+      );
+      const idx = conversations.value.findIndex((c) => c.id === id);
+      if (idx !== -1) {
+        conversations.value[idx] = { ...conversations.value[idx], ...updated };
+      }
+      if (currentConversation.value?.id === id) {
+        currentConversation.value.model = updated.model;
+      }
+    } catch (e) {
+      useToastStore().show("Failed to update model", "error");
+      throw e;
+    }
+  }
+
   return {
     conversations,
     currentConversation,
@@ -317,6 +355,7 @@ export const useChatStore = defineStore("chat", () => {
     streamingContent,
     lastContextMeta,
     models,
+    runningModels,
     ollamaStatus,
     modelStatus,
     defaultModel,
@@ -331,6 +370,9 @@ export const useChatStore = defineStore("chat", () => {
     saveMessageAsNote,
     summarizeAsNote,
     fetchModels,
+    fetchRunningModels,
+    warmModel,
+    updateConversationModel,
     fetchStatus,
     startStatusPolling,
     stopStatusPolling,