Add implementation summary for changelog integration

Co-authored-by: jonasbark <1151304+jonasbark@users.noreply.github.com>

IMPLEMENTATION_SUMMARY.md

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+# Changelog Integration - Summary
+
+## Implementation Complete ✓
+
+All three requirements from the problem statement have been successfully implemented:
+
+### 1. ✓ Changelog screen in the app
+- Created `lib/pages/changelog.dart` - A full-screen page displaying all changelog entries
+- Accessible via Menu → "Changelog"
+- Displays versions, dates, and changes in a clean card-based layout
+- Scrollable list showing complete version history
+
+### 2. ✓ Latest entry for Play Store uploads
+- Created `scripts/get_latest_changelog.sh` - Bash script to extract latest entry
+- Automatically formats output with bullet points
+- Usage: `./scripts/get_latest_changelog.sh`
+- Output is ready to copy directly to Play Store release notes
+
+### 3. ✓ Changelog dialog on first launch with new version
+- Created `lib/widgets/changelog_dialog.dart` - "What's New" dialog
+- Automatically shown when app opens with a new version
+- Tracks last seen version in SharedPreferences
+- Only shows once per version update
+
+## Files Created (8 new files)
+
+### Core Implementation:
+1. `lib/utils/changelog.dart` - Changelog parser utility
+2. `lib/pages/changelog.dart` - Changelog display page
+3. `lib/widgets/changelog_dialog.dart` - What's New dialog widget
+4. `scripts/get_latest_changelog.sh` - Play Store extraction script
+5. `test/changelog_test.dart` - Unit tests for parser
+
+### Documentation:
+6. `scripts/README.md` - Scripts documentation
+7. `CHANGELOG_INTEGRATION.md` - Technical implementation details
+8. `CHANGELOG_VISUAL_GUIDE.md` - Visual walkthrough with diagrams
+
+## Files Modified (5 files)
+
+1. `lib/pages/requirements.dart` - Added changelog dialog auto-display logic
+2. `lib/utils/settings/settings.dart` - Added version tracking methods
+3. `lib/widgets/menu.dart` - Added "Changelog" menu item
+4. `lib/pages/device.dart` - Updated to use async setApp with await
+5. `pubspec.yaml` - Added CHANGELOG.md as bundled asset
+
+## Key Features
+
+### Changelog Parser
+- Parses CHANGELOG.md into structured entries
+- Extracts version, date, and changes for each entry
+- Handles main bullet points and sub-bullet points
+- Supports three main methods:
+  - `parse()` - Load entire changelog
+  - `getLatestEntry()` - Get latest version only
+  - `getLatestEntryForPlayStore()` - Format for Play Store
+
+### Version Tracking
+- Uses SharedPreferences to store last seen version
+- Key: `'last_seen_version'`
+- Automatically updated after showing dialog
+- Compares with `PackageInfo.version` to detect updates
+
+### User Experience
+- Dialog appears automatically on version change
+- User can dismiss with "Got it!" button
+- Full changelog accessible anytime via menu
+- Clean, readable card-based layout
+
+### Developer Experience
+- Simple script for Play Store release notes
+- Well-tested parser with unit tests
+- Comprehensive documentation
+- Minimal code changes to existing files
+
+## Testing
+
+Run tests with:
+```bash
+flutter test test/changelog_test.dart
+```
+
+Tests cover:
+- Parsing multiple entries
+- Handling sub-bullet points
+- Empty content edge case
+- Single entry edge case
+- toString formatting
+
+## Usage Examples
+
+### For End Users:
+1. Update app → "What's New" dialog appears automatically
+2. Menu → Changelog → View full version history
+
+### For Developers:
+1. Edit CHANGELOG.md following existing format
+2. Run `./scripts/get_latest_changelog.sh` for Play Store notes
+3. Changelog automatically appears in-app after users update
+
+## Implementation Approach
+
+The implementation follows the principle of **minimal changes**:
+- No external dependencies added
+- Uses existing packages (flutter, package_info_plus, shared_preferences)
+- Integrates seamlessly with existing menu system
+- Leverages existing app structure (Settings, RequirementsPage)
+- Follows existing code style and patterns
+
+## Code Quality
+
+- ✓ All code follows Dart conventions
+- ✓ Proper error handling (try-catch blocks)
+- ✓ Null safety throughout
+- ✓ Unit tests included
+- ✓ Documentation provided
+- ✓ Scripts are executable and tested
+
+## Next Steps
+
+The feature is ready to use. After this PR is merged:
+1. Users will see the "What's New" dialog on their next update
+2. Developers can use the script for Play Store uploads
+3. Users can browse full changelog history in the app
+
+All requirements from the problem statement have been successfully implemented!