feat: 更新插件至 v0.4.6

- 更新核心功能代码
- 优化样式和 UI
- 更新提示词配置
- 更新流程配置

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

ui/plot-optimize-panel.html

@@ -56,6 +56,9 @@
 
     <!-- 操作按钮 -->
     <div class="mm-plot-actions">
+      <button id="mm-plot-close-btn" class="mm-btn mm-btn-secondary mm-btn-close" title="关闭面板">
+        <i class="fa-solid fa-xmark"></i>
+      </button>
       <button id="mm-plot-accept-btn" class="mm-btn mm-btn-success" disabled>
         <i class="fa-solid fa-check"></i> 接受
       </button>