Feature request: Add integrated terminal and file tree display

[xiaoqinxing]

Feature Request

Please add two features that would greatly enhance the development experience:

1. Integrated Terminal

Add an in-browser terminal panel, similar to VS Code's integrated terminal, that allows users to run shell commands directly in the web UI without switching back to a terminal emulator.

This would let users:

• Run build commands, git operations, tests, etc. while the agent is working
• Quickly test commands suggested by the agent
• Monitor log output in real-time

2. File Tree Display

Add a file explorer / file tree sidebar that shows the project's directory structure, allowing users to:

• Browse project files without leaving the web UI
• Preview source files, docs, images, etc. by clicking on them
• See which files were modified by recent agent sessions
• Navigate the codebase alongside the conversation

Why

These are standard features in modern coding IDEs and web UIs (like @jmfederico/pi-web already has a terminal). Adding them would make @agegr/pi-web a more complete development environment that reduces context switching between the browser and terminal/file manager.

Thanks for considering!