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

CHANGELOG.md

@@ -0,0 +1,71 @@
+# Changelog
+
+All notable changes to this project will be documented in this file.
+
+The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
+
+---
+
+## [1.4.0] - 2026-03-18
+
+### Added
+- **Desktop Contribute Dashboard**: Full desktop layout for the Contribute screen, matching the web version at eventifyplus.com/contribute
+  - "Contributor Dashboard" title with 3-tab navigation (Contribute, Leaderboard, Achievements)
+  - Two-column submit event form — Event Title + Category side-by-side, Date + Location side-by-side
+  - Contributor Level gradient card with 5-tier milestone progress bar (Bronze → Silver → Gold → Platinum → Diamond)
+  - Sub-navigation row: My Events / Submit Event / Reward Shop
+  - Desktop Leaderboard with All Time / This Month toggle, district pills, podium, and full rank table
+  - Desktop Achievements with 3-column badge grid, progress bars, and lock icons
+  - Inline Reward Shop with RP balance badge and shop item cards
+- **Gamification Feature Module** (`lib/features/gamification/`):
+  - `GamificationProvider` — ChangeNotifier-based state management
+  - `GamificationService` — mock data for EP, RP, leaderboard entries, achievements, and shop items
+  - Models: `LeaderboardUser`, `Achievement`, `ShopItem`, `ContributorStats`
+- **Bottom Sheet Date Filters**: Home screen event-category filter chips now open in a modal bottom sheet on mobile
+- Web runner script (`run_web.sh`) for local Flutter web development server
+
+### Changed
+- **Profile Screen**: Completely redesigned to match the web app layout — gradient header card, avatar, stats row (Likes / Posts / Views), and tabbed content
+- **Profile Card Animations**: Smooth entrance animations matching the React web component
+- **Contribute Screen (Mobile)**: Full 4-tab rebuild — Contribute, Leaderboard, Achievements, Shop — with animated glass-glider tab bar indicator
+- **Login Screen**: Updated UI design aligned with the web version
+- **Event Detail Screen**: Layout updates and improved API data binding
+- **Theme**: Refreshed dark/light mode colour palette and surface colours
+- **API Client**: Updated base URL and endpoint paths in `lib/core/api/api_endpoints.dart`
+- **Fonts**: Integrated full Gilroy font family (Light, Regular, Medium, SemiBold, Bold, ExtraBold — with italic variants)
+- **Responsive Layout**: Improved breakpoint handling; desktop threshold set at 820 px
+
+### Fixed
+- Profile card pixel-perfect alignment with the web version
+- Calendar screen date-range filter and location search integration
+- District dropdown naming conflict in leaderboard (`_lbDistricts` vs. `_districts`)
+- Green points colour (#16A34A) on desktop leaderboard matching web (was blue #0F45CF on mobile)
+
+---
+
+## [1.3.0] - 2026-02-xx
+
+### Added
+- Leaderboard tab and Achievements tab added to the Contribute screen
+- Bouncy sliding glass-glider animation for Contribute tab bar
+
+---
+
+## [1.2.0] - 2026-01-xx
+
+### Added
+- Responsive dual-layout system with 820 px breakpoint
+- Date filtering on the Home screen event feed
+- Location search integration
+- Calendar screen bug fixes and improvements
+
+---
+
+## [1.1.0] - 2025-12-xx
+
+### Added
+- Initial screens: Login, Home, Events, Profile, Calendar, Search, Booking
+- Desktop variants: `DesktopLoginScreen`, `HomeDesktopScreen`
+- Flutter launcher icons and native splash screen
+- Gilroy font integration (initial)
+- `shared_preferences` session caching