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/e2e/jest.config.js

@@ -0,0 +1,11 @@
+module.exports = {
+  maxWorkers: 1,
+  rootDir: '..',
+  testMatch: ['<rootDir>/e2e/**/*.e2e.[jt]s?(x)'],
+  testTimeout: 120000,
+  verbose: true,
+  reporters: ['detox/runners/jest/reporter'],
+  globalSetup: 'detox/runners/jest/globalSetup',
+  globalTeardown: 'detox/runners/jest/globalTeardown',
+  testEnvironment: 'detox/runners/jest/testEnvironment'
+};