Enhance contact page with real-time validation, keyboard shortcuts, and improved UX

CONTACT_ENHANCEMENTS.md

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+# Contact Page Enhancements
+
+This document describes the enhancements made to the new-contact page (`src/app/new-contact/page.tsx`) to improve the user experience for amateur radio operators.
+
+## Enhancements Implemented
+
+### 1. Real-time Form Validation
+
+Added comprehensive validation with visual feedback for critical fields:
+
+- **Callsign Validation**: Validates amateur radio callsign format using regex pattern `^[A-Z0-9]{1,3}[0-9][A-Z0-9]{0,3}[A-Z]$`
+- **Grid Locator Validation**: Validates Maidenhead grid locator format (4 or 6 character format)
+- **Frequency Validation**: 
+  - Checks frequency range (0.1 to 300000 MHz)
+  - Validates that frequency is within amateur radio bands
+  - Provides clear error messages for out-of-band frequencies
+
+**Visual Feedback**: Invalid fields show red borders and error messages with alert icons.
+
+### 2. Mode-Specific RST Auto-Adjustment
+
+Automatically sets appropriate RST values based on the selected mode:
+
+- **CW Mode**: Sets RST to "599" (standard CW report)
+- **Voice Modes** (SSB, FM, AM): Sets RST to "59" (standard voice report)
+- **Digital Modes** (FT8, FT4, PSK31, etc.): Sets RST to "-10" (signal-to-noise ratio)
+
+This follows amateur radio best practices and reduces manual input errors.
+
+### 3. Enhanced Form Organization
+
+Improved visual organization with logical field grouping:
+
+- **Contact Information**: Callsign, frequency, mode, band
+- **Date & Time**: DateTime field with live logging functionality
+- **Signal Reports**: RST sent/received with mode-specific hints
+- **Station Information**: Name, QTH, grid locator
+
+Each section has clear headers with visual separators for better readability.
+
+### 4. Keyboard Shortcuts
+
+Added keyboard shortcuts for efficient logging:
+
+- **Ctrl+Enter**: Save contact (quick submit)
+- **Ctrl+L**: Focus callsign field (quick start new contact)
+- **Ctrl+Q**: Trigger QRZ lookup (quick callsign lookup)
+
+These shortcuts are displayed in a help section at the bottom of the form.
+
+### 5. Enhanced Error Handling
+
+Improved error handling and user feedback:
+
+- Real-time validation prevents submission of invalid data
+- Clear error messages with specific guidance
+- Visual indicators for validation state
+- Prevention of form submission with validation errors
+
+### 6. Accessibility Improvements
+
+- Better ARIA labeling for screen readers
+- Clear visual hierarchy with proper heading structure
+- Keyboard navigation support
+- High contrast error indicators
+- Responsive design for mobile amateur radio logging
+
+## Technical Implementation
+
+### Validation Functions
+
+```typescript
+const validateCallsign = (callsign: string): string | null
+const validateGridLocator = (grid: string): string | null  
+const validateFrequency = (frequency: string): string | null
+```
+
+### Real-time Validation
+
+Validation occurs on field change using the `validateField` function, updating the `validationErrors` state for immediate feedback.
+
+### Mode-Specific Logic
+
+The `handleSelectChange` function includes logic to automatically adjust RST values when the mode changes, following amateur radio conventions.
+
+### Keyboard Shortcuts
+
+Implemented using a global `keydown` event listener that handles key combinations and focuses appropriate form elements.
+
+## Testing
+
+### Automated Tests
+
+- All existing contact management tests pass
+- New enhancement-specific tests validate responsive design and code compilation
+- Build process validates TypeScript compilation and linting
+
+### Manual Testing
+
+The enhanced contact page maintains full backward compatibility while adding new features. All existing functionality continues to work as expected.
+
+## Benefits for Amateur Radio Operators
+
+1. **Reduced Logging Errors**: Real-time validation prevents common amateur radio data entry mistakes
+2. **Faster Logging**: Keyboard shortcuts and auto-fill features speed up contact entry
+3. **Better Organization**: Logical field grouping matches typical amateur radio logging workflow
+4. **Mobile-Friendly**: Enhanced responsive design supports field day and portable operations
+5. **Standards Compliance**: Validation ensures data follows amateur radio conventions
+
+## Future Enhancement Opportunities
+
+- Contest logging fields (exchange, contest name)
+- Duplicate contact detection and warnings
+- Integration with propagation prediction data
+- Quick logging templates for different operating modes
+- Integration with real-time DX cluster data