fix: 修复 Think 模式开关无效 — toggleThink 缺少 change 事件导致 state 未同步

- model-bar.ts: 新增 toggleThink change 事件监听，同步 state.thinkEnabled
- setThinkAvailable(true) 保留自动开启行为（模型支持时强制开启）
- 版本号 0.11.5 → 0.11.6，同步7个文件13处

README.md

@@ -14,7 +14,7 @@
 </p>
 
 <p align="center">
-  <img src="https://img.shields.io/badge/version-v0.11.5-E8734A?style=flat-square" alt="version">
+  <img src="https://img.shields.io/badge/version-v0.11.6-E8734A?style=flat-square" alt="version">
   <img src="https://img.shields.io/badge/electron-33+-47848F?style=flat-square&logo=electron" alt="electron">
   <img src="https://img.shields.io/badge/typescript-5.7+-3178C6?style=flat-square&logo=typescript" alt="typescript">
   <img src="https://img.shields.io/badge/license-MIT-green?style=flat-square" alt="license">
@@ -245,7 +245,7 @@ npm start
 ELECTRON_MIRROR=https://npmmirror.com/mirrors/electron/ npm run dist
 ```
 
-产出：`release/Metona Ollama Setup v0.11.5.exe`
+产出：`release/Metona Ollama Setup v0.11.6.exe`
 
 ## 🛠️ 常用命令
 
@@ -481,7 +481,7 @@ npm start
 ELECTRON_MIRROR=https://npmmirror.com/mirrors/electron/ npm run dist
 ```
 
-Output: `release/Metona Ollama Setup v0.11.5.exe`
+Output: `release/Metona Ollama Setup v0.11.6.exe`
 
 ## 🛠️ Common Commands