feat(computer): open live VNC desktop inside the app

[milind-soni]

What changed

• opens Box and Local VM live desktops in a sandboxed modal owned by OpenMausBot
• makes Take control acquire the existing input lock before opening the interactive desktop
• pauses redundant screenshot polling while the live viewer is open
• keeps a browser fallback for non-Electron development and viewer load failures
• isolates remote viewer storage, navigation, and permissions; never persists or logs rotating desktop URLs

Why a native modal

Box documents that authenticated VNC must load as a top-level page. A normal iframe would fail its token exchange, so the Electron modal is its own sandboxed top-level web contents while remaining visually inside the app.

Verification

• pnpm build
• pnpm typecheck
• pnpm check:electron
• pnpm test (1,362 registered tests; broker, updater, viewer security, and packaged-server checks all pass)

Manual check

The remaining useful check is opening a real Box desktop and Local VM in a packaged build to confirm provider rendering and platform modal behavior.

[coderabbitai]

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