Stabilize final Trip Editor E2E validation

[stef-k]

#297 final determinism stabilization

Fixes the final full-suite Trip Editor E2E determinism failures after Batches 1-6.

Changes:

• Stabilized copy-link feedback assertions without racing the 1800ms reset lifecycle.
• Fixed inline segment editor row layout so active segment editors do not overlap following row controls.
• Made sidebar search fixtures prefer an editable normal region/place pair while preserving Unassigned Places coverage in dedicated tests.
• Scoped visual-polish Expand clicks to the docked editor and scrolls them into view before clicking.
• Prevented real CRUD cleanup from retrying segment IDs already deleted by the test.
• Scoped rich-notes time budgets for full-suite load and tightened image assertions around inserted/data-image contracts.

Validation

• Original failing tests passed focused/repeated.
• Failing specs together passed: 18 passed.
• Full npm run test:e2e:trip-editor passed: 117 passed, 32.9m.
• npx playwright test --config=playwright.config.ts --list passed: 117 tests.
• dotnet build passed.
• dotnet test passed.
• npm run build passed.
• npm run smoke:trip-editor:assets:dev passed.
• npm run smoke:trip-editor:assets:published passed.
• LOC check passed; tripEditorRichNotes.spec.ts is exactly 600 LOC and accepted as cohesive existing rich-notes parity coverage at the cap.
• git diff --check and artifact hygiene were clean.

Claim Boundary

This does not add new product scope, does not weaken #297 proof boundaries, does not convert real endpoint tests back to mocked tests, and does not add skips.