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

lib/screens/learn_more_screen.dart

@@ -6,6 +6,7 @@ import 'package:flutter/material.dart';
 import 'package:google_maps_flutter/google_maps_flutter.dart';
 import 'package:share_plus/share_plus.dart';
 import 'package:url_launcher/url_launcher.dart';
+import 'package:cached_network_image/cached_network_image.dart';
 
 import '../features/events/models/event_models.dart';
 import '../features/events/services/events_service.dart';
@@ -430,10 +431,21 @@ class _LearnMoreScreenState extends State<LearnMoreScreen> {
                     child: Stack(
                       fit: StackFit.expand,
                       children: [
-                        Image.network(
-                          images[_currentPage],
+                        CachedNetworkImage(
+                          imageUrl: images[_currentPage],
                           fit: BoxFit.cover,
-                          errorBuilder: (_, __, ___) => Container(
+                          width: double.infinity,
+                          height: double.infinity,
+                          placeholder: (_, __) => Container(
+                            decoration: const BoxDecoration(
+                              gradient: LinearGradient(
+                                begin: Alignment.topLeft,
+                                end: Alignment.bottomRight,
+                                colors: [Color(0xFF1A56DB), Color(0xFF3B82F6)],
+                              ),
+                            ),
+                          ),
+                          errorWidget: (_, __, ___) => Container(
                             decoration: const BoxDecoration(
                               gradient: LinearGradient(
                                 begin: Alignment.topLeft,
@@ -476,11 +488,15 @@ class _LearnMoreScreenState extends State<LearnMoreScreen> {
                   controller: _pageController,
                   onPageChanged: (i) => setState(() => _currentPage = i),
                   itemCount: images.length,
-                  itemBuilder: (_, i) => Image.network(
-                    images[i],
+                  itemBuilder: (_, i) => CachedNetworkImage(
+                    imageUrl: images[i],
                     fit: BoxFit.cover,
                     width: double.infinity,
-                    errorBuilder: (_, __, ___) => Container(
+                    placeholder: (_, __) => Container(
+                      color: theme.dividerColor,
+                      child: const Center(child: CircularProgressIndicator(strokeWidth: 2)),
+                    ),
+                    errorWidget: (_, __, ___) => Container(
                       color: theme.dividerColor,
                       child: Icon(Icons.broken_image, size: 48, color: theme.hintColor),
                     ),
@@ -672,10 +688,10 @@ class _LearnMoreScreenState extends State<LearnMoreScreen> {
                         child: Stack(
                           children: [
                             Positioned.fill(
-                              child: Image.network(
-                                'https://maps.googleapis.com/maps/api/staticmap?center=$lat,$lng&zoom=15&size=600x300&markers=color:red%7C$lat,$lng&key=',
+                              child: CachedNetworkImage(
+                                imageUrl: 'https://maps.googleapis.com/maps/api/staticmap?center=$lat,$lng&zoom=15&size=600x300&markers=color:red%7C$lat,$lng&key=',
                                 fit: BoxFit.cover,
-                                errorBuilder: (_, __, ___) => Container(
+                                errorWidget: (_, __, ___) => Container(
                                   color: const Color(0xFFE8EAF6),
                                   child: Column(
                                     mainAxisAlignment: MainAxisAlignment.center,