docs: comprehensive documentation updates and modernization

- Update BUILDING.md with current build system information
- Modernize various README files across the project
- Update CHANGELOG.md with recent changes
- Improve documentation consistency and formatting
- Update platform-specific documentation (iOS, Electron, Docker)
- Enhance test documentation and build guides

doc/migration-quick-reference.md

@@ -63,6 +63,7 @@ export default class ComponentName extends Vue {
 ## ✅ **Validation Checklist**
 
 After each file migration:
+
 - [ ] No databaseUtil imports
 - [ ] PlatformServiceMixin added
 - [ ] Method calls updated
@@ -91,4 +92,4 @@ npm run lint && npx tsc --noEmit
 ---
 
 **Last Updated**: $(date)
-**Full Documentation**: `doc/migration-progress-tracker.md` 
+**Full Documentation**: `doc/migration-progress-tracker.md`