feat: add embedded terminal panel

[musnows]

Summary

• Add an embedded bottom terminal panel with xterm rendering and persistent PTY sessions.
• Add multi-tab terminal support with right-click tab actions for rename, close other tabs, and close all tabs.
• Integrate terminal IPC through preload/main with payload validation and lazy node-pty loading.
• Update packaging so node-pty assets are unpacked and helper binaries remain executable.

Details

The terminal panel is toggled from the workbench top bar and is rendered as a full-width bottom drawer under the chat composer. The terminal starts closed on app launch and clears the previous persisted open state, so a terminal session is only created after explicit user action.

Each tab owns a stable PTY session id. Switching tabs reattaches the renderer to the existing session, while close actions dispose of the backing PTY. The tab context menu is rendered through a body portal and supports secondary-click fallback handling so the menu is visible and not clipped by the terminal header.

Validation

• npm run typecheck
• npm run build
• npm run dist:mac:arm64
• npm run build && npx --yes electron-builder@26.8.1 --config electron-builder.config.cjs --config.npmRebuild=false --publish never --win nsis --x64
• Installed the macOS arm64 build locally and verified terminal launch, tab context menu, close-all behavior, and startup with terminal closed.
• Built Windows x64 NSIS installer: dist/Kun-0.1.0-win-x64.exe

#258

[musnows]

内置终端

mac

windows