VSC: Chat webview panel

[Hmbown]

Summary

A VS Code webview hosts the chat UI and talks to the local server via fetch plus SSE.

Acceptance criteria

• Side-panel chat with composer.
• Streaming tokens.
• Tool-call display.
• Same Plan/Agent/YOLO modes.

Files

extensions/vscode/src/webview/

Size

M

Source

Source tag: VSC. Add exact upstream/opencode source links during implementation if they are not already known. Do not copy external code blindly; port the behavior into this repo's architecture.

Filed from 2026-05-02 v0.8.8 intake.