Add Trip Editor real CRUD contract coverage

[stef-k]

Summary

Implements #297 Batch 2 only: real endpoint CRUD contract coverage for the Trip Editor.

• Adds focused real endpoint CRUD contract coverage for region, place, area, and segment persistence.
• Region/place/area flows use UI creation/deletion where applicable and prove visible state plus reload/API reread.
• Place coverage includes moving between a normal region and Unassigned Places.
• Segment coverage is endpoint-focused: real segment create, route-save, reorder, and delete endpoints are exercised with reload/API reread plus visible row/order/delete assertions. This does not claim full route map-work UI drawing coverage.

Out Of Scope

• Batch 3 stale/error UX and failed-save/delete-failure behavior.
• Batch 4 search-add persistence after Trip Editor RC geosearch add-place workflow and place-edit parity regressions #295.
• Batch 5 rich-notes sanitizer/persistence real contract.
• Batch 6 Development/published production asset smoke.
• Product behavior changes.

Validation

• Focused new spec: 4 passed.
• Segment focused rerun: 1 passed.
• npx playwright test --config=playwright.config.ts --list: passed, 110 tests listed.
• dotnet build: passed.
• dotnet test: passed, 1537 tests.
• LOC check: passed with warnings only; new spec is 447 counted LOC, accepted as cohesive Batch 2 real CRUD contract coverage under the 600 hard cap.
• git diff --check origin/main...HEAD: passed.
• tracked artifact scan: clean.

Notes

Existing mocked Trip Editor specs remain in place for frontend rendering, request shape, Sortable/map-work draft behavior, rich notes UI, icon/marker visuals, and error/visual states. They are not used as CRUD persistence proof.