Implement v1.1 enhancements: auto-rotate, interactive gauge, and extended units

Features added:
- Auto-rotate support for portrait/landscape orientations
- Interactive gauge: tap to switch between digital and analog modes
- Extended speed units: added knots with quick selector buttons
- New SpeedUnitSelector widget for convenient unit switching

Known issues identified:
- 10 package dependencies need updates to latest compatible versions
- Orientation switching needs to override system auto-rotate toggle
- Background color customization moved back to TODO (build issues)

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

README.md

@@ -9,11 +9,11 @@ A customizable Flutter speedometer app using GPS location services to display re
 - Real-time speed display using GPS
 - High-precision location tracking
 - Works offline (no internet connection required)
-- Portrait orientation for mobile phones
+- Automatic portrait/landscape orientation support
 
 ### Customizable Settings
-- **Speed Units**: mph, km/h (expandable for more units)
-- **Display Style**: Digital speedometer, analog gauge (expandable for more styles)
+- **Speed Units**: mph, km/h, knots (with convenient unit selector buttons)
+- **Display Style**: Digital speedometer, analog gauge (tap gauge to switch)
 - **Theme**: Light/Dark mode (expandable for custom themes)
 - **Metrics Display**: Toggle additional metrics on/off
   - Current location coordinates
@@ -23,11 +23,17 @@ A customizable Flutter speedometer app using GPS location services to display re
 
 ### Technical Specifications
 - Target Platform: Android (primary)
-- Screen Orientation: Portrait (locked)
-- Target Device: Mobile phones
+- Screen Orientation: Auto-rotate (portrait/landscape)
+- Target Device: Mobile phones and tablets
 - GPS Requirements: Location permissions required
 - Offline Capability: Full functionality without internet
 
+### New Features in v1.1
+- **Auto-rotate Support**: App now supports both portrait and landscape orientations
+- **Interactive Gauge**: Tap the speedometer to switch between digital and analog modes
+- **Extended Units**: Added knots as a speed unit option
+- **Unit Selector**: Quick access unit selection buttons next to the speedometer
+
 ## Architecture Design
 
 The app is designed with customization and extensibility in mind: