Codex/workrequest service refactor

[SebastianCelejewski]

Summary

This PR refactors the work request UI to use the service layer, adds E2E coverage for work request flows and promotion, and cleans up the Playwright suite structure.

Changes

• refactor work request list, edit, and details screens to use WorkRequestService
• add service-layer support for loading, observing, and deleting work requests
• fix work request mapper behavior for create flows without an id
• add date/time helpers used by the work request editor
• add Playwright coverage for:
  • work request create/edit/delete
  • work request promotion into activity
• add stable data-testid hooks for work request screens
• reorganize E2E tests into:
  • tests/e2e/bootstrap
  • tests/e2e/regression
• remove deprecated or unused E2E specs:
  • smoke.spec.ts
  • activity-creation.spec.ts
• add tests/e2e/tsconfig.json so editor/test typing works correctly for Playwright files

Verification

• tsc --noEmit
• tsc -p tests/e2e/tsconfig.json --noEmit
• Playwright work request tests passed locally