feat(desktop): restore session when switching profiles

[zaycruz]

Summary

Closes #77952.

Hermes Desktop already stores the last route and session per profile for cold-start restore. Profile switching still discarded the foreground session and opened a fresh draft. This change uses the existing per-profile state for live profile switching.

Behavior

• Save and restore the last non-overlay route for each profile.
• Restore the remembered session when the route points to a session.
• Open a new chat when the target profile has no remembered session.
• Wait for the target gateway before restoring the route.
• Coalesce rapid profile switches so an older switch cannot restore the wrong profile.
• Keep explicit New Session actions unchanged.
• Restore correctly when leaving All profiles mode.

Verification

• npx vitest run --project ui src/store/profile.test.ts — passed, 15 tests.
• npm run typecheck — passed.
• npx prettier --check src/app/contrib/wiring.tsx src/store/profile.ts src/store/profile.test.ts — passed.
• npm run build — passed.
• npm run lint -- --quiet — blocked because the workspace install did not link eslint.
• The combined profile/session test command exposed an existing UI test setup failure: its localStorage stub has no setItem, removeItem, or clear methods. The changed profile test passes independently.

[zaycruz]

Adversarial quality gate — GREEN

Iteration 2 passed all required available gates on base and head:

• Focused unit: base 11/11, head 15/15
• Affected regression: base 57/57, head 61/61
• Adjacent route/session tests: 53/53 on both
• Type check, format, ESLint, and production build: pass on both

Adversarial review found no MUST-FIX findings.

ACCEPTABLE-RISK:

1. The exact ContribWiring React effect has no direct component harness.
2. Desktop E2E is disabled globally by the repository CI orchestrator while Desktop E2E red on every PR since Aug 1 engines churn — suite temporarily disabled, needs root fix + re-enable #76627 tracks the failure.

The durable Markdown and HTML reports are saved locally at:

/Users/master/Mac-Studio/Hermes/Quality Reports/hermes-agent-pr-77957-cf1c9975c/

The gate caught and corrected false local failures caused by invalid Node localStorage setup and incomplete baseline dependencies before assigning the final result.