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>

apps/mobile/app.config.ts

@@ -9,7 +9,6 @@ export default ({ config }: ConfigContext): ExpoConfig => ({
   orientation: "portrait",
   icon: "./assets/icon.png",
   userInterfaceStyle: "light",
-  newArchEnabled: true,
   splash: {
     image: "./assets/splash-icon.png",
     resizeMode: "contain",
@@ -29,8 +28,5 @@ export default ({ config }: ConfigContext): ExpoConfig => ({
   web: {
     favicon: "./assets/favicon.png",
   },
-  experiments: {
-    monorepo: true,
-  },
   plugins: ["expo-router"],
 });

apps/mobile/app/__tests__/smoke.test.tsx

@@ -0,0 +1,11 @@
+import React from "react";
+import { render, screen } from "@testing-library/react-native";
+import { Text } from "react-native";
+
+describe("Jest + React Native Testing Library", () => {
+  it("renders a component", () => {
+    render(<Text testID="hello">Hello</Text>);
+    expect(screen.getByTestId("hello")).toBeTruthy();
+    expect(screen.getByText("Hello")).toBeTruthy();
+  });
+});

apps/mobile/package.json

@@ -7,7 +7,16 @@
     "start": "expo start",
     "android": "expo start --android",
     "ios": "expo start --ios",
-    "web": "expo start --web"
+    "web": "expo start --web",
+    "typecheck": "tsc --noEmit",
+    "test": "jest",
+    "lint": "eslint ."
+  },
+  "jest": {
+    "preset": "jest-expo",
+    "transformIgnorePatterns": [
+      "node_modules/(?!(.pnpm/)?((jest-)?react-native|@react-native(-community)?|expo(nent)?|@expo(nent)?/.*|@expo-google-fonts/.*|react-navigation|@react-navigation/.*|@trails-cool/.*))"
+    ]
   },
   "dependencies": {
     "@trails-cool/api": "workspace:*",
@@ -24,7 +33,10 @@
     "react-native-screens": "~4.23.0"
   },
   "devDependencies": {
+    "@testing-library/react-native": "^13.3.3",
+    "@types/jest": "^30.0.0",
     "@types/react": "~19.2.14",
+    "jest-expo": "^55.0.15",
     "typescript": "~5.9.2"
   }
 }

apps/mobile/tsconfig.json

@@ -1,6 +1,7 @@
 {
   "extends": "expo/tsconfig.base",
   "compilerOptions": {
-    "strict": true
+    "strict": true,
+    "allowImportingTsExtensions": true
   }
 }