Scope

• Phone-only map-first bottom drawer for the Trip Editor.
• Trip / Regions / Segments tabs.
• Reuses the existing editor state and draft model.
• Preserves dirty prompts, validation, Save/Cancel/Delete, selection, search-add, and map-work behavior.
• No backend/API changes.

Breakpoint

• Drawer is scoped to max-width: 640px.
• 641px, 700px, and 768px are protected as non-drawer widths.

Validation

• npm run test:e2e:trip-editor: passed, 131 passed (4.6m).
• Focused mobile drawer: npx playwright test --config=playwright.config.ts tests/e2e/trip-editor/tripEditorMobileDrawer.spec.ts: passed, 13 passed (25.3s).
• npm run build: passed. Vite emitted the existing large chunk warning for main-go9yiDc7.js.
• npx playwright test --config=playwright.config.ts --list: passed, listed 131 tests in 20 files.
• dotnet run --project tools/Wayfarer.LocCheck -- --warn 400 --fail 600: passed with LOC warnings only, including tripEditorMobileDrawer.spec.ts (448 LOC) and existing Trip Editor files above the 400-line review threshold; no hard failures.
• git diff --check origin/main...HEAD: passed.
• Artifact scan: no tracked or untracked files under .local, playwright-report, test-results, screenshots, traces, wwwroot/vite/trip-editor, or wwwroot/dist.
• Worktree clean before PR creation.

Pending before merge

• Manual mobile screenshot review.
• Asset smokes:
  • npm run smoke:trip-editor:assets:dev
  • npm run smoke:trip-editor:assets:published

Fixes #312