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/views/ChatView.vue

@@ -6,6 +6,7 @@ import { useSettingsStore } from "@/stores/settings";
 import { apiGet } from "@/api/client";
 import { renderMarkdown } from "@/utils/markdown";
 import ChatMessage from "@/components/ChatMessage.vue";
+import ModelSelector from "@/components/ModelSelector.vue";
 import type { Note } from "@/types/note";
 
 const route = useRoute();
@@ -28,6 +29,9 @@ const noteSearchResults = ref<{ id: number; title: string }[]>([]);
 const noteSearchLoading = ref(false);
 let noteSearchTimer: ReturnType<typeof setTimeout> | null = null;
 
+// Model selection
+const selectedModel = ref("");
+
 // Exclude tracking (session-scoped per conversation)
 const excludedNoteIds = ref<Set<number>>(new Set());
 
@@ -71,6 +75,12 @@ onMounted(async () => {
   await store.fetchConversations();
   if (convId.value) {
     await store.fetchConversation(convId.value);
+    if (store.currentConversation?.model) {
+      selectedModel.value = store.currentConversation.model;
+    }
+  }
+  if (!selectedModel.value) {
+    selectedModel.value = store.defaultModel;
   }
   nextTick(() => inputEl.value?.focus());
 });
@@ -101,6 +111,26 @@ watch(convId, async (newId) => {
   nextTick(() => inputEl.value?.focus());
 });
 
+// Sync selectedModel from loaded conversation
+watch(
+  () => store.currentConversation?.model,
+  (model) => {
+    if (model) selectedModel.value = model;
+  }
+);
+
+// Persist model changes to backend
+watch(selectedModel, (newModel, oldModel) => {
+  if (
+    newModel &&
+    oldModel &&
+    newModel !== oldModel &&
+    store.currentConversation
+  ) {
+    store.updateConversationModel(store.currentConversation.id, newModel);
+  }
+});
+
 watch(
   () => store.streamingContent,
   () => scrollToBottom()
@@ -124,7 +154,7 @@ async function selectConversation(id: number) {
 }
 
 async function newConversation() {
-  const conv = await store.createConversation();
+  const conv = await store.createConversation("", selectedModel.value);
   await store.fetchConversation(conv.id);
   router.push(`/chat/${conv.id}`);
 }
@@ -313,6 +343,10 @@ function excludeAutoNote(noteId: number) {
               <line x1="3" y1="18" x2="21" y2="18"/>
             </svg>
           </button>
+          <ModelSelector
+            v-model="selectedModel"
+            :disabled="store.streaming"
+          />
           <h2>{{ store.currentConversation.title || "New Chat" }}</h2>
           <button
             v-if="store.currentConversation.messages.length"
@@ -584,6 +618,8 @@ function excludeAutoNote(noteId: number) {
   overflow: hidden;
   text-overflow: ellipsis;
   white-space: nowrap;
+  flex: 1;
+  min-width: 0;
 }
 
 .btn-summarize {