fix(desktop): resolve getComputerUseMcpCommand crash on Windows settings page

[Pallavikumarimdb]

Summary

Resolves the White Screen of Death (WSOD) crash on Windows when booting or opening settings.

1. Backend: Prevented getComputerUseMcpCommand() from throwing a hard exception on non-macOS platforms. It now returns null so the caller falls back to the default command gracefully.
2. Types: Updated getComputerUseMcpCommand in desktop-ipc.ts to allow string[] | null.
3. Frontend: Fixed a TypeError in the browser plugin check in settings-route.tsx where .some() was called on config.command when it was parsed as a string at runtime instead of an array.

Why

Issue

• Closes [Bug]: Windows: hard throw in getComputerUseMcpCommand() crashes desktop renderer (blank screen) on 0.17.30 and 0.17.32 #2908

Scope

Out of scope

Testing

Ran

pnpm typecheck

### Result
- pass/fail:
- if fail, exact files/errors:

## CI status
- pass:
- code-related failures:
- external/env/auth blockers:

## Manual verification
1.
2.
3.

## Evidence
- video/screenshot link, or `N/A (docs-only)`

## Risk
-

## Rollback
-

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Project	Deployment	Actions	Updated (UTC)
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