DeepCode：侧边栏视图（Sidebar View）vscode插件

[yinuosi933]

功能需求
当前 DeepCode 仅使用 WebviewView，窗口固定在侧边栏。希望新增命令，支持将聊天界面以 WebviewPanel（编辑器标签面板）打开。

我的使用场景
我主要使用 Keil 阅读、编辑工程代码，VSCode 仅用来放置 AI 对话窗口。
侧边栏竖窄窗口空间有限，阅读长段代码分析、调试日志很不友好。
如果能把 DeepCode 放到 WebviewPanel，窗口可以自由拉大、横向布局，对话内容浏览体验会大幅提升。

当前方案存在的局限

1. WebviewView 固定侧边栏，宽度上限受限，无法自由拓宽窗口；
2. 不能作为独立标签放置在编辑器区域，缺少灵活的窗口尺寸调节能力；
3. 长对话、大段代码回复阅读时视野狭窄。

期望效果
新增命令：DeepCode: 在编辑器面板打开对话

1. 保留现有的侧边栏模式，两种打开方式共存，不影响现有用户；
2. WebviewPanel 模式与侧边栏共享会话记录；
3. 聊天窗口支持自由拖拽、最大化、任意调整宽高，获得更大可视区域。
   感谢开发者维护！

Feature Request
Currently DeepCode only uses WebviewView fixed inside the sidebar. I hope you can add a command to launch the chat window as a WebviewPanel editor tab.

My workflow
I view and edit project code in Keil. VSCode is only used to host the AI chat window.
The narrow sidebar view limits visible content. A resizable WebviewPanel would offer a much larger viewport for reading long code explanations and debug logs.

Limitations of the current sidebar-only mode

1. WebviewView is constrained to sidebar width and cannot be freely widened;
2. It cannot be placed as an independent tab inside the editor area;
3. Long conversations and large code blocks are hard to read in the narrow vertical sidebar.

Expected behavior
Add a command like DeepCode: Open Chat in Editor Panel

1. Keep the existing sidebar view; support both modes at the same time.
2. The panel shares conversation history with the sidebar chat.
3. The chat window can be freely dragged and resized for a larger viewing area.

Thanks for your work!