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feat: Add web interface for CLI using xterm.js#2

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feat-web-cli-5845840651256945843
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feat: Add web interface for CLI using xterm.js#2
google-labs-jules[bot] wants to merge 2 commits into
mainfrom
feat-web-cli-5845840651256945843

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This PR adds a web-based terminal interface to the Gemini CLI.
Users can now run gemini --web (optionally with --port <port>, defaulting to 4040) to access the CLI via a web browser.
The implementation uses a WebSocket server (Socket.io) to stream the PTY output to an xterm.js frontend, ensuring full feature parity with the standard TUI.


PR created automatically by Jules for task 5845840651256945843 started by @vivekmaru

Adds a new `--web` flag to the CLI which starts a web server exposing the terminal interface via a browser using xterm.js.

- Adds `express`, `socket.io`, `xterm`, `xterm-addon-fit` dependencies.
- Implements `startWebServer` using `node-pty` (via `getPty`) to spawn the CLI process.
- Updates `gemini.tsx` to handle the `--web` flag and start the server.
- Updates `config.ts` to include `web` and `port` options.
- Updates tests.
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Adds a new `--web` flag to the CLI which starts a web server exposing the terminal interface via a browser using xterm.js.

- Adds `express`, `socket.io`, `xterm`, `xterm-addon-fit`, `@types/socket.io` dependencies.
- Implements `startWebServer` using `node-pty` (via `getPty`) to spawn the CLI process.
- Updates `gemini.tsx` to handle the `--web` flag and start the server.
- Updates `config.ts` to include `web` and `port` options.
- Updates tests and fixed typescript errors.
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