feat: add settings page for web dictation app

Description

Create a dedicated Settings page for the Web Dictation App where users can manage application preferences and personalization options.

Requirements

• Add a responsive Settings page UI
• Support both Light and Dark theme switching
• Add microphone/audio input settings
• Add language selection for dictation
• Add transcription preferences (auto-save, punctuation, timestamps, etc.)
• Add account/profile section if user authentication exists
• Persist settings using local storage or backend API
• Ensure proper navigation integration with existing app layout
• Maintain clean and consistent UI/UX with the rest of the application

Acceptance Criteria

• Users can open the Settings page from navigation/menu
• All settings are editable and saved correctly
• Theme changes apply across the application
• Settings persist after page refresh/relogin
• Page is fully responsive on desktop and mobile
• No UI breaking or console errors occur