feat: 选中模型持久化为默认，刷新后自动恢复选中

js/app.js

@@ -23,10 +23,12 @@ console.log('[Metona] 模块化版本 v2.1.0 ' + new Date().toISOString());
 // ── 会话管理 ──
 
 function createNewSession() {
+    const selectedModel = document.querySelector('#modelSelect')?.value || '';
+    const defaultModel = selectedModel || state.get('_defaultModel', '');
     return {
         id: generateId(),
         title: '新会话',
-        model: document.querySelector('#modelSelect')?.value || '',
+        model: defaultModel,
         messages: [],
         createdAt: Date.now(),
         updatedAt: Date.now()
@@ -96,7 +98,10 @@ async function init() {
 
         // 7. 恢复上次选择的模型
         const savedModel = await db.getSetting('selectedModel', '');
-        if (savedModel) setSelectedModel(savedModel);
+        if (savedModel) {
+            setSelectedModel(savedModel);
+            state.set('_defaultModel', savedModel);
+        }
 
         // 8. 恢复系统提示词和上下文长度
         const systemPromptEnabled = await db.getSetting('systemPromptEnabled', false);

js/components/model-bar.js

@@ -23,6 +23,9 @@ export function initModelBar() {
     modelSelectEl.addEventListener('change', async () => {
         const model = modelSelectEl.value;
         if (db()) await db().saveSetting('selectedModel', model);
+        state.set('_defaultModel', model);
+        const session = state.get(KEYS.CURRENT_SESSION);
+        if (session) session.model = model;
         if (model) {
             await checkModelCapability(model);
         } else {
@@ -70,9 +73,9 @@ export async function loadModels() {
             });
 
         // 恢复上次选择的模型
-        const currentSession = state.get(KEYS.CURRENT_SESSION);
-        if (currentSession?.model) {
-            modelSelectEl.value = currentSession.model;
+        const defaultModel = state.get('_defaultModel', '');
+        if (defaultModel) {
+            modelSelectEl.value = defaultModel;
         }
 
         if (db()) await db().saveSetting('selectedModel', modelSelectEl.value);