chore: update package.json for testing scripts and dependencies

- Added unit and end-to-end testing scripts to package.json.
- Included detox for end-to-end testing and jest-circus for improved test execution.

feat: add testID to LandingScreen logo for better testing

- Added testID attribute to the logo image in LandingScreen for easier identification in tests.

feat: create tokens.ts to re-export design tokens

- Introduced tokens.ts to re-export shared design tokens from lightTheme for consistent imports.

app/detox.config.js

@@ -0,0 +1,48 @@
+/**
+ * Detox configuration with both attached-device and emulator options.
+ * A helper script (e2e/run-detox.js) will pick the attached device if present,
+ * otherwise fall back to the emulator configuration.
+ */
+module.exports = {
+  testRunner: {
+    $0: 'jest',
+    args: {
+      config: 'e2e/jest.config.js',
+      _: ['e2e']
+    }
+  },
+  devices: {
+    'android.attached': {
+      type: 'android.attached',
+      device: {
+        adbName: '.*' // match any attached device
+      }
+    },
+    'android.emulator': {
+      type: 'android.emulator',
+      device: {
+        avdName: 'Pixel_3a_API_30_x86'
+      }
+    }
+  },
+  apps: {
+    'android.debug': {
+      type: 'android.apk',
+      binaryPath: 'android/app/build/outputs/apk/debug/app-debug.apk',
+      build: 'cd android && ./gradlew assembleDebug assembleAndroidTest -DtestBuildType=debug && cd ..',
+      testBinaryPath: 'android/app/build/outputs/apk/androidTest/debug/app-debug-androidTest.apk',
+      reversePorts: [8081],
+      launchTimeout: 120000 // wait up to 2 min for the app to connect (Metro must be running)
+    }
+  },
+  configurations: {
+    'android.attached+android.debug': {
+      device: 'android.attached',
+      app: 'android.debug'
+    },
+    'android.emu.debug+android.debug': {
+      device: 'android.emulator',
+      app: 'android.debug'
+    }
+  }
+};