Standardize monorepo pipeline: test, lint, typecheck across all workspaces

Previously only 2-3 workspaces participated in each turbo task. This
expands test, lint, and typecheck to cover all 11 workspaces with
parallel execution and caching.

Test pipeline:
- Move from single root vitest to per-workspace test scripts via turbo
- Shared vitest config (vitest.shared.ts) with passWithNoTests
- Per-workspace configs re-export the shared base
- Mobile uses Jest (jest-expo + React Native Testing Library)
- Add node-environment GPX tests verifying linkedom fallback
- Add i18n mobile init tests
- Exclude apps/mobile from root vitest (uses Jest separately)

Lint pipeline:
- Add eslint lint script to all 9 previously unlinted workspaces
- Standardize all scripts to "eslint ." with shared root config
- Add .expo/ to global ESLint ignores
- Fix lint errors: unused imports in api/types, export parseGpx

Typecheck pipeline:
- Add "typecheck": "tsc" to all 8 packages
- Add @types/node (catalog) to gpx and db packages
- Fix mobile app.config.ts: remove deprecated experiments.monorepo
  and newArchEnabled (both default in Expo SDK 55)
- Add allowImportingTsExtensions to mobile tsconfig

Shared package compatibility (mobile-app Phase 1.3):
- Add linkedom as explicit dependency to @trails-cool/gpx
- Add initI18nMobile() export to @trails-cool/i18n
- Confirm @trails-cool/types is pure interfaces (no DOM deps)

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

openspec/changes/mobile-app/tasks.md

@@ -19,11 +19,11 @@
 
 ### 1.3 Shared Package Compatibility
 
-- [ ] 1.3.1 Audit `@trails-cool/types` for DOM/Node.js dependencies — confirm it's pure TypeScript interfaces
-- [ ] 1.3.2 Refactor `@trails-cool/gpx` to use a platform-agnostic XML parser: use `linkedom` on Node.js and `DOMParser` on React Native/browser
-- [ ] 1.3.3 Write unit tests for `parseGpx()` and `generateGpx()` running in a jsdom-free environment to verify no DOM dependency
-- [ ] 1.3.4 Verify `@trails-cool/i18n` initializes in React Native — add an `initMobile()` export if the current init assumes a browser environment
-- [ ] 1.3.5 Add `apps/mobile` to Turborepo pipeline (`turbo.json`) for build and typecheck
+- [x] 1.3.1 Audit `@trails-cool/types` for DOM/Node.js dependencies — confirm it's pure TypeScript interfaces
+- [x] 1.3.2 Refactor `@trails-cool/gpx` to use a platform-agnostic XML parser: use `linkedom` on Node.js and `DOMParser` on React Native/browser
+- [x] 1.3.3 Write unit tests for `parseGpx()` and `generateGpx()` running in a jsdom-free environment to verify no DOM dependency
+- [x] 1.3.4 Verify `@trails-cool/i18n` initializes in React Native — add an `initMobile()` export if the current init assumes a browser environment
+- [x] 1.3.5 Add `apps/mobile` to Turborepo pipeline (`turbo.json`) for build and typecheck
 
 ### 1.4 Journal Auth (OAuth2 PKCE)
 
@@ -126,7 +126,7 @@
 
 ### 4.1 Unit & Component Tests
 
-- [ ] 4.1.1 Set up Jest + jest-expo + React Native Testing Library in `apps/mobile/`
+- [x] 4.1.1 Set up Jest + jest-expo + React Native Testing Library in `apps/mobile/`
 - [ ] 4.1.2 Write unit tests for API client (mocked fetch, auth refresh, error handling)
 - [ ] 4.1.3 Write component tests for route list, route detail, and route editor screens
 - [ ] 4.1.4 Write unit tests for offline SQLite storage layer