feat(terminal): activate terminal with xterm.js + node-pty

[HUQIANTAO]

Motivation

The desktop app ships with a terminal backend (electron/terminal-manager.ts) and frontend components (TerminalDrawer, TerminalInstance), but the drawer was never mounted in the layout — users cannot access a terminal at all. The existing backend uses child_process.spawn with piped stdio, which lacks PTY semantics (no resize, no full-screen TUI apps, broken readline editing). The frontend renders ANSI output via ansi-to-react with a plain <input> field, falling far short of a real terminal emulator.

This PR activates the dormant terminal and upgrades it end-to-end: node-pty on the backend, xterm.js on the frontend.

What changed

Backend — real PTY via node-pty

electron/terminal-manager.ts — rewritten to use pty.spawn() instead of child_process.spawn. This enables:

• resize(cols, rows) that actually works (was a no-op before)
• Full-screen TUI programs (vim, htop, lazygit, etc.)
• Proper readline/line-editing behavior
• Native xterm-256color escape sequence handling

The IPC contract (terminal:create/write/resize/kill/onData/onExit) is unchanged; electron/main.ts and electron/preload.ts require no modifications.

Frontend — xterm.js terminal emulator

src/components/terminal/TerminalInstance.tsx — replaced ansi-to-react + <input> with a full @xterm/xterm Terminal instance:

• FitAddon — auto-fits the terminal to its container on resize
• WebLinksAddon — clickable URLs in output
• Bidirectional PTY I/O: terminal.onData() → write(), pty output → terminal.write()

Layout integration

• AppShell.tsx — mounts <TerminalDrawer /> at the bottom of the data-app-shell flex column (below the content row). Lazy-loaded via next/dynamic following the existing AppShell pattern.
• UnifiedTopBar.tsx — adds a terminal toggle button in the panel-controls area (between File Tree and Workspace Sidebar), consistent with existing panel toggle UX.
• Keyboard shortcut — Cmd+`` (macOS) / Ctrl+`` (Windows/Linux) toggles the terminal drawer globally.

Build configuration

File	Change
scripts/build-electron.mjs	node-pty added to esbuild external
scripts/after-pack.js	node-pty added to electron-rebuild -o and onlyModules
electron-builder.yml	**/node-pty/** added to asarUnpack

Testing

1. npm run electron:dev — launch desktop dev mode
2. Click the terminal icon in the top bar, or press Cmd+`
3. Verify: interactive shell prompt, colored output, resize auto-fit, TUI app support (e.g. vim, htop)
4. Verify: close button kills the PTY process cleanly

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