feat(chat): enhance chat settings and message bubble styles

- Introduced dynamic chat settings for font size and message bubble radius, improving user customization.
- Updated ChatScreen styles to support dynamic themes and responsive layouts.
- Refactored bubble styles to utilize dynamic properties for better visual consistency.
- Simplified chat settings management by integrating Zustand store for state management.

This update significantly enhances the chat interface and user experience by allowing personalized settings and improved visual elements.

src/screens/auth/RegisterScreen.tsx

@@ -262,7 +262,6 @@ export const RegisterScreen: React.FC = () => {
           {/* 步骤指示器 */}
           <RegisterStepIndicator
             currentStep={currentStep}
-            completedSteps={completedSteps}
             containerStyle={styles.stepIndicator}
           />