Add biometric authentication registration functionality

- Implement biometric registration methods in appBridge
- Add openBiometricRegistrationPopup and closeBiometricRegistrationPopup functions
- Integrate biometric registration UI in home page and auth register component
- Fix TypeScript errors in useAppBridge hook

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

src/utils/appBridge.ts

@@ -163,10 +163,26 @@ class AppBridge {
     return this.sendMessage(BridgeMessageType.LOGIN, credentials);
   }
 
+  // 로그아웃 요청
   async logout(): Promise<void> {
     return this.sendMessage(BridgeMessageType.LOGOUT);
   }
 
+  // 간편 인증 등록 요청
+  async registerBiometric(): Promise<void> {
+    return this.sendMessage(BridgeMessageType.REGISTER_BIOMETRIC);
+  }
+
+  // 간편 인증 등록 팝업 열기
+  async openBiometricRegistrationPopup(): Promise<boolean> {
+    return this.sendMessage(BridgeMessageType.OPEN_BIOMETRIC_REGISTRATION_POPUP);
+  }
+
+  // 간편 인증 등록 팝업 닫기
+  async closeBiometricRegistrationPopup(): Promise<void> {
+    return this.sendMessage(BridgeMessageType.CLOSE_BIOMETRIC_REGISTRATION_POPUP);
+  }
+
   // 언어 설정
   async setLanguage(language: string): Promise<void> {
     return this.sendMessage(BridgeMessageType.SET_LANGUAGE, { language });