🎛️ New Settings Section

• New "Version" Tab: Added to plugin settings (Settings > Snippets Settings > Version)
• Current Version Display: Shows active version with distinctive styling
• Available Versions: Fetches and displays all versions from WordPress.org repository

🔄 Version Switching Interface

• Smart Dropdown: Lists available versions with current version highlighted
• One-Click Switching: Secure version change execution with validation
• Real-time Feedback: Loading states, progress indicators, success/error messages
• Safety Features:
  • ⚠️ Compatibility warnings with backup recommendations
  • 🔒 Progress tracking prevents concurrent operations
  • 🔄 Automatic page refresh after successful switches

🚀 Performance & Caching

• Intelligent Caching: 1-hour cache for version data (reduces API calls)
• Manual Refresh: Force cache updates with dedicated button
• Auto-cleanup: Cache cleared after successful version switches

🔐 Security & Safety

• WordPress Standards: Nonce verification, capability checks (update_plugins)
• Progress Locking: Transient-based system prevents concurrent switches
• Error Handling: Comprehensive logging with user-friendly messages
• Core Integration: Uses WordPress upgrader for maximum reliability

🎨 User Experience

• Responsive Design: Mobile and desktop optimized
• Visual Feedback: Clear states (loading, success, error, warning)
• Intuitive Flow: Dropdown → Warning → Confirmation → Progress → Success
• Accessibility: Proper ARIA labels and keyboard navigation

📋 Prerequisites

• WordPress admin access with plugin update permissions
• Active Code Snippets plugin installation
• Hosting environment that allows plugin updates

1️⃣ Settings Access

• Passed

# Test Steps:
1. Navigate to "Snippets > Settings"
2. Click "Version" tab
3. Verify current version display
4. Confirm dropdown population

Expected: Clean interface with current version highlighted, dropdown populated with available versions.

2️⃣ Version Selection Flow

• Passed

# Test Steps:
1. Select different version from dropdown
2. Observe button state changes
3. Check warning message appearance
4. Verify current version remains disabled

Expected: Switch button enables, warning appears, current version shows "(Current)" label.

3️⃣ Cache Refresh Mechanism

• Passed

# Test Steps:
1. Click "Refresh Available Versions"
2. Monitor button text changes
3. Wait for completion
4. Verify page reload

Expected: Button shows "Refreshing..." → "Refreshed!" → page reloads with fresh data.

4️⃣ Successful Version Switch

• Passed

# Test Steps:
1. Select stable previous version
2. Click "Switch Version"  
3. Monitor progress messages
4. Wait for completion
5. Verify version change

Expected:
- Button → "Switching..." (disabled)
- Progress message appears
- Success confirmation
- Auto-refresh after 3 seconds
- New version displayed

5️⃣ Error Handling

• Passed

# Test Network Issues:
1. Disable internet connection
2. Attempt version switch
3. Verify error handling

# Test Permission Issues:  
1. Test with non-admin user
2. Attempt access
3. Verify permission messages

Expected: Graceful error handling, no fatal errors, clear user guidance.

6️⃣ Concurrent Operation Prevention

• Passed

# Test Steps:
1. Open two browser tabs
2. Start switch in tab 1
3. Immediately try switch in tab 2

Expected: Second attempt blocked with "switch in progress" message.

7️⃣ Input Validation

• Passed

# Test Steps:
1. Use dev tools to modify dropdown values
2. Submit invalid version
3. Verify rejection

Expected: Server-side validation rejects invalid versions with error message.

8️⃣ CSRF Protection

• Passed

# Test Steps:  
1. Submit AJAX request without nonce
2. Verify security rejection

Expected: Request blocked with "Security check failed" message.

✅ Success Indicators

• Immediate Feedback: Visual confirmation of all user actions
• Progress Transparency: Users always know current operation status
• State Persistence: Interface reflects actual plugin state
• Error Recovery: Failed operations don't leave system in bad state

⚠️ Error Handling

• Graceful Degradation: Errors don't break interface
• Actionable Messages: Users get clear next steps
• Safe Fallbacks: No partial installs or corrupted states
• Debug Information: Errors logged for troubleshooting

📁 File Changes

• src/php/settings/version-switch.php: Complete version switching logic
• src/css/settings.scss: UI styling and responsive design
• Settings integration: Proper WordPress settings API usage

• Requires internet connectivity for version fetching
• Depends on WordPress.org API availability
• File system write permissions needed for upgrades
• Some hosting providers may block plugin modifications