release: bump version to 1.4(p) (versionCode 14)

- Update versionCode 12 → 14, versionName 1.3(p) → 1.4(p)
- Update pubspec.yaml version to 1.4.0+14
- Add CHANGELOG.md with full version history
- Update README.md: version badge + changelog section
- Desktop Contribute Dashboard rebuilt to match web version
  - Contributor Dashboard title, 3-tab nav (Contribute/Leaderboard/Achievements)
  - Two-column submit form, tier milestone progress bar
  - Desktop leaderboard with podium, filters, rank table (green points)
  - Desktop achievements 3-column badge grid
  - Inline Reward Shop with RP balance
- Gamification feature module (EP, RP, leaderboard, achievements, shop)
- Profile screen redesigned to match web app layout with animations
- Home screen bottom sheet date filter chips
- Updated API endpoints, login/event detail screens, theme colors
- Added Gilroy font suite, responsive layout improvements

README.md

@@ -17,6 +17,7 @@
 [![Flutter](https://img.shields.io/badge/Flutter-%2302569B.svg?style=for-the-badge&logo=flutter&logoColor=white)](https://flutter.dev/)
 [![Dart](https://img.shields.io/badge/Dart-%230175C2.svg?style=for-the-badge&logo=dart&logoColor=white)](https://dart.dev/)
 [![Platform](https://img.shields.io/badge/Platform-iOS%20%7C%20Android%20%7C%20Web%20%7C%20Desktop-lightgrey?style=for-the-badge)](#)
+[![Version](https://img.shields.io/badge/version-1.4.0--preview-blue?style=for-the-badge)](#)
 
 </div>
 
@@ -123,6 +124,18 @@ The app uses an initialization check in `main.dart` that intercepts the launch v
 
 ---
 
+## 📋 Changelog
+
+See [CHANGELOG.md](./CHANGELOG.md) for a full history of changes.
+
+### Latest (v1.4.0 — Preview)
+- **Desktop Contribute Dashboard** rebuilt to match the web version (Contributor Dashboard, 3-tab nav, two-column form, leaderboard, achievements, reward shop)
+- **Gamification module** — EP, RP, leaderboard, achievements, shop with Provider state management
+- **Profile screen** redesigned to match the web app layout with animations
+- Enhanced animations, responsive improvements, Gilroy font suite, and API updates
+
+---
+
 <div align="center">
   <sub>Built with ❤️ by the Eventify Team</sub>
 </div>