…pre-test checklist

  - Add Normalized Power, Variability Index, Efficiency Factor calculations
  - Add FTP history charts with Bar/Trend/Protocol comparison modes
  - Add session recovery after crash/restart with abandonment detection
  - Add expandable pre-test checklist on home screen
  - Show 12 results in history (was 8)
  - Track heart rate samples during tests
  - Fix hasRecoverableData() to check elapsed time only

### HomeScreen Redesign
- Compact Garmin Edge-style layout with hero FTP display
- Horizontal protocol selector (RAMP / 20-MIN / 2×8-MIN)
- Clean visual hierarchy without cluttered labels

### Navigation Improvements
- Fixed screen flickering during transitions
- Unified navigation using popBackStack
- Separated LaunchedEffects for different state changes
- Proper state cleanup on test stop

### New Features
- Pre-test checklist as dedicated full-screen
- Sensor warning screen when power meter not detected
- App guide tour (Settings → Guide)
- Complete translation sync for all 10 languages

### UI Polish
- Better spacing, typography, and touch targets
- Consistent button layouts across screens

Updated instructions for transferring APK to Karoo.

…improvements

Tutorial Screen:
- Complete redesign with 8-page interactive guide
- Replaced HorizontalPager with button navigation (PREV/NEXT/DONE)
- Added realistic Canvas power diagrams for each protocol
- Pre-generated noise data for smooth performance
- Unified TutorialListItem style across all pages
- Compact mockups for During Test and Results pages
- Optimized for Karoo 3 small screen (no scrolling needed)

Results & Zones:
- Added W/kg display on Results screen
- Added W/kg column to Power Zones table

Settings:
- Added weight editing capability
- Weight used for W/kg calculations

Performance:
- Removed infinite animations
- Optimized Canvas rendering with fewer points
- Pre-computed noise arrays instead of random generation

Translations:
- Updated all 10 locales with new tutorial strings

Translations:
- Standardized NP, VI, EF abbreviations across all locales (international cycling standard)
- Fixed mixed language in Russian (ГАЙД ПО APP → ГАЙД ПРИЛОЖЕНИЯ)
- Fixed Russian settings_screen_on to convey action (НЕ ГАСИТЬ ЭКРАН)
- Fixed German/Spanish running_testing (TESTING → TEST/PRUEBA)
- Added missing strings to all 10 locales (231 strings each)

README:
- Added Power Zones table with % FTP ranges
- Added Interactive Tutorial section (8 pages)
- Added Supported Languages section (10 languages)
- Expanded installation options (USB, ADB, Web)
- Added troubleshooting tips