[EXTENSION] Add inactivity lock integration test

[wheval]

Summary

Test inactivity-detector triggers lock after configured idle time.

Background

Independently implementable. Does not require Stellar Wave program tracking.

Scope

• apps/extension-wallet/src/security/inactivity-detector.ts

Files to create / modify

Vitest with fake timers.

Example implementation

vi.advanceTimersByTime(IDLE_MS + 1); expect(lock).toHaveBeenCalled();

Acceptance criteria

• Passes in CI
• Documents default idle timeout

Difficulty

Medium

Labels

enhancement, medium, extension