Add parameterized surface test for all 6 RN components

[EmilioBejasa]

Summary

• Registers all 6 RN components with AppRegistry in index.js so they can be started as surfaces in tests
• Adds ComponentSurfaceTest, a @Parameterized test that runs constructViewTest once per component, asserting the surface view is non-null after start()

Test plan

• CI passes all 6 parameterized test cases (MyFeature, SwitchFeature, TimerFeature, CoinFlipFeature, Button, Header)

🤖 Generated with Claude Code

[tdrhq]

Before we do this change, go back to focussing on just taking a screenshot in IsolatedTest. Once that screenshot test is working in isolation then we can come back to this change.