* test(e2e): extract paired client window reveal into helper
Paired clients launch hidden, parking runtime subscriptions. Playwright-driven
clients must be revealed to test actual user interactions. Extract the reveal
logic into a reusable helper with error handling and unit tests.
* test(e2e): handle crash dialogs and isolate collision fixture IDs
- Recover from recoverable UI error dialogs in selectRuntimeHost
- Give the same-ID collision fixture unique repo and worktree IDs to avoid
reusing the runtime repo's ID, preventing fixture leakage
- Simplify verbose comments for clarity