DSH Chat for VS Code

Key features

• Pure Editor Window Form (OpenCode): DSH Chat is a stand-alone window in the editor area, parallel to the code window - each window = a full session workspace: with a session tab bar, + new, open new windows, history, model chooser, problem card.
• ws /api/events.hosthost state flow (host/session-status run flip, host/session-added, etc.)
• VS Code in the development mode suggests that "webview without a environment security policy" -- this is a fixed hint from VS Code to the original space of webview HTML, which actually sets up a complete CSP and only develops an environment that is visible and negligible.
• The window wants to open a few openings and drag them to any editor group in parallel.
• Full independence between windows: new window always creates a completely new independent session (new context) with separate, unsynchronized windows