fix(ios): register CarPlayDashboard before dashboard connects

[LukasB-DEV]

Problem

CarPlayDashboard is currently only registered with React Native's AppRegistry after the dashboard scene reports didConnect.

That makes the dashboard root component registration depend on the CarPlay connection lifecycle. In some reload/reconnect flows, the native dashboard scene can request a React root view for the CarPlayDashboard module before JS has received a fresh didConnect event again.

In that case React Native throws:

Invariant Violation: "CarPlayDashboard" has not been registered.

Reproduction

In a consuming app using CarPlayDashboard.setComponent(...):

1. Start the app with CarPlay enabled.
2. Open the CarPlay Dashboard scene.
3. Close/disconnect the CarPlay scene.
4. Reload the React Native app / Metro while the dashboard scene lifecycle is still around or reconnect CarPlay afterwards.
5. The native side can try to create a root view for CarPlayDashboard before JS registers the component again.

Observed result:

"CarPlayDashboard" has not been registered

Expected result:

CarPlayDashboard should be registered once the JS component is provided via setComponent(...). Native root view initialization should still only happen while the dashboard scene is connected.

What Changed

• Register the CarPlayDashboard component as soon as setComponent(...) has provided the component.
• Keep HybridCarPlayDashboard.initRootView() guarded by the current isConnected state.
• Add a small componentRegistered guard so reconnects do not repeatedly call AppRegistry.registerComponent(...).

Why

AppRegistry.registerComponent(...) is JS runtime setup and does not need an active CarPlay Dashboard connection.

initRootView() is the part that needs the native dashboard scene/window to be connected, so that remains connection-gated.

This keeps the existing native lifecycle behavior intact while making the JS module registration deterministic across reloads and reconnects.

Testing

• Verified in a consuming app that the iOS simulator build succeeds.
• Verified that CarPlayDashboard is registered before native dashboard root view initialization is requested.
• Existing dashboard initialization still only calls initRootView() when the dashboard is connected.