fix: resolve React Native Fabric mounting crash

[KimthoHey]

Fixes crash in React Native 0.76+ with Fabric enabled:

Caused by com.facebook.react.bridge.RetryableMountingLayerException: Unable to find viewState for tag 432

Root Cause: EventDispatcher was initialized too early in the component lifecycle, before the view was properly mounted in Fabric.

Solution:

• Fixed event dispatcher initialization timing in RCTLoginButton.java
• Added safety checks for view attachment state and valid IDs
• Added exception handling to prevent crashes
• Added Fabric codegen configuration and component specs

Changes:

• Deferred EventDispatcher initialization until view is attached
• Added onAttachedToWindow() lifecycle hook
• Created TypeScript component specifications for Fabric codegen
• Updated package.json with codegen configuration

Compatibility: ✅ RN 0.76+ (Fabric) ✅ RN 0.63+ (Bridge) ✅ Expo SDK 53+

[stale]

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