feat: add comprehensive Quick Start section and clean:all command

- Add Quick Start for Developers section with most common commands
- Add clean:all command to package.json for cleaning all platforms
- Update BUILDING.md with accurate command descriptions and workflow
- Reorganize sections to prioritize npm commands at the top
- Add comprehensive environment configuration documentation
- Update appendices A and B with current build system information
- Fix port number in development server documentation (8080)
- Add troubleshooting quick fixes and platform-specific guidance
- Document environment variable precedence and loading process
- Add comprehensive Vite configuration documentation in Appendix B

package.json

@@ -92,6 +92,7 @@
     "clean:android": "adb uninstall app.timesafari.app || true",
     "clean:ios": "rm -rf ios/App/build ios/App/Pods ios/App/output ios/App/App/public ios/DerivedData ios/capacitor-cordova-ios-plugins ios/App/App/capacitor.config.json ios/App/App/config.xml || true",
     "clean:electron": "./scripts/build-electron.sh --clean",
+    "clean:all": "npm run clean:ios && npm run clean:android && npm run clean:electron",
     "build:android": "./scripts/build-android.sh",
     "build:android:dev": "./scripts/build-android.sh --dev",
     "build:android:test": "./scripts/build-android.sh --test",