Build Settings Page with User Preferences

**Title:** Create Comprehensive Settings Page with Multiple Configuration Options

## Problem Statement

Users cannot customize their quiz experience or manage app preferences. A settings page is essential for user satisfaction, allowing customization of appearance, notifications, accessibility, and other preferences.

## Proposed Solution

Develop a full-featured settings page with:

* Account settings (profile, password)
* Appearance preferences (theme, font size)
* Quiz settings (default difficulty, time limits)
* Accessibility options
* Sound and notification settings
* Data management (export, clear history)

## Acceptance Criteria

### ✅ Settings Page Layout

* Sidebar navigation with sections
* Tabbed interface for mobile
* Icons for each settings category
* Responsive design for all devices
* Breadcrumb navigation
* Auto-save indicators for changes

### ✅ Account Settings Section

* Profile picture upload/change (simulated)
* Username change with validation
* Email display and change option
* Password change form (frontend only)
* Account creation date
* Delete account button (with confirmation)

### ✅ Appearance Settings

* Theme selector (Light/Dark/System)
* Font size slider (Small/Medium/Large/Extra Large)
* Color scheme options (predefined palettes)
* Animation speed control (Reduced motion for accessibility)
* Compact/Comfortable display density
* Preview pane showing changes in real-time

### ✅ Quiz Settings

* Default difficulty level dropdown
* Default number of questions slider
* Auto-submit on time expiration toggle
* Show correct answers after submission toggle
* Enable/disable timer by default
* Preferred quiz categories (multi-select)

### ✅ Accessibility Options

* High contrast mode toggle
* Screen reader support toggle
* Keyboard navigation hints toggle
* Focus indicator enhancement
* Dyslexia-friendly font option
* Motion reduction toggle

### ✅ Sound Settings

* Master volume slider
* Mute all sounds toggle
* Individual sound effect toggles (correct/incorrect answers, timer)
* Button click sounds toggle
* Test sound button for each effect

### ✅ Notification Settings

* Enable desktop notifications (simulated)
* Daily reminder toggle and time picker
* Streak reminder toggle
* Achievement notification toggle
* Email notifications (UI only)

### ✅ Data Management

* Export quiz history as JSON/CSV
* Clear all quiz history button
* Clear cache button
* Reset all settings to default
* Data usage statistics display
* Each action requires confirmation modal

### ✅ About Section

* App version number
* Changelog/Release notes link
* Terms of service link
* Privacy policy link
* Attribution for libraries/APIs used
* Contact/Support information