feat: Phase 3 — 26 medium-priority gaps implemented

P3-A/K  Profile: Eventify ID glassmorphic badge (tap-to-copy), DiceBear
        Notionists avatar via TierAvatarRing, district picker (14 pills)
        with 183-day cooldown lock, multipart photo upload to server
P3-B    Home: Top Events converted to PageView scroll-snap
        (viewportFraction 0.9 + PageScrollPhysics)
P3-C    Event detail: contributor widget (tier ring + name + navigation),
        related events horizontal row; added getEventsByCategory() to
        EventsService; added contributorId/Name/Tier fields to EventModel
P3-D    Kerala pincodes: 463-entry JSON (all 14 districts), registered as
        asset, async-loaded in SearchScreen replacing hardcoded 32 cities
P3-E    Checkout: promo code field + Apply/Remove button in Step 2,
        discountAmount subtracted from total, applyPromo()/resetPromo()
        methods in CheckoutProvider
P3-F/G  Gamification: reward cycle countdown + EP→RP progress bar (blue→
        amber) in contribute + profile screens; TierAvatarRing in podium
        and all leaderboard rows; GlassCard current-user stats card at
        top of leaderboard tab
P3-H    New ContributorProfileScreen: tier ring, stats, submission grid
        with status chips; getDashboardForUser() in GamificationService;
        wired from leaderboard row taps
P3-I    Achievements: 11 default badges (up from 6), 6 new icon map
        entries; progress % labels already confirmed present
P3-J    Reviews: CustomPainter circular arc rating ring (amber, 84px)
        replaces large rating number in ReviewSummary
P3-L    Share rank card: RepaintBoundary → PNG capture → Share.shareXFiles;
        share button wired in profile header and leaderboard tab
P3-M    SafeArea audit: home bottom nav, contribute/achievements scroll
        padding, profile CustomScrollView top inset

New files: tier_avatar_ring.dart, glass_card.dart,
  eventify_bottom_sheet.dart, contributor_profile_screen.dart,
  share_rank_card.dart, assets/data/kerala_pincodes.json
New dep:   path_provider ^2.1.0

lib/features/reviews/widgets/review_summary.dart

@@ -1,7 +1,97 @@
 // lib/features/reviews/widgets/review_summary.dart
+import 'dart:math' show pi;
 import 'package:flutter/material.dart';
 import '../models/review_models.dart';
-import 'star_display.dart';
+
+class _RatingRingPainter extends CustomPainter {
+  final double rating;
+
+  const _RatingRingPainter({required this.rating});
+
+  @override
+  void paint(Canvas canvas, Size size) {
+    final center = Offset(size.width / 2, size.height / 2);
+    final radius = size.width / 2 - 6;
+
+    // Background track
+    canvas.drawArc(
+      Rect.fromCircle(center: center, radius: radius),
+      -pi / 2,
+      2 * pi,
+      false,
+      Paint()
+        ..color = Colors.white12
+        ..style = PaintingStyle.stroke
+        ..strokeWidth = 7
+        ..strokeCap = StrokeCap.round,
+    );
+
+    // Filled arc
+    if (rating > 0) {
+      canvas.drawArc(
+        Rect.fromCircle(center: center, radius: radius),
+        -pi / 2,
+        (rating.clamp(0.0, 5.0) / 5.0) * 2 * pi,
+        false,
+        Paint()
+          ..color = const Color(0xFFFBBF24)
+          ..style = PaintingStyle.stroke
+          ..strokeWidth = 7
+          ..strokeCap = StrokeCap.round,
+      );
+    }
+  }
+
+  @override
+  bool shouldRepaint(_RatingRingPainter old) => old.rating != rating;
+}
+
+class _RatingRingWidget extends StatelessWidget {
+  final double rating;
+  final int reviewCount;
+
+  const _RatingRingWidget({required this.rating, required this.reviewCount});
+
+  @override
+  Widget build(BuildContext context) {
+    return Column(
+      mainAxisSize: MainAxisSize.min,
+      children: [
+        SizedBox(
+          width: 84,
+          height: 84,
+          child: CustomPaint(
+            painter: _RatingRingPainter(rating: rating),
+            child: Center(
+              child: Column(
+                mainAxisSize: MainAxisSize.min,
+                children: [
+                  Text(
+                    rating.toStringAsFixed(1),
+                    style: const TextStyle(
+                      fontSize: 22,
+                      fontWeight: FontWeight.w800,
+                      color: Colors.white,
+                    ),
+                  ),
+                  const Text(
+                    '/5',
+                    style: TextStyle(fontSize: 10, color: Color(0xFF94A3B8)),
+                  ),
+                ],
+              ),
+            ),
+          ),
+        ),
+        const SizedBox(height: 4),
+        Text(
+          '$reviewCount ${reviewCount == 1 ? 'review' : 'reviews'}',
+          style: const TextStyle(fontSize: 11, color: Color(0xFF94A3B8)),
+        ),
+      ],
+    );
+  }
+}
 
 class ReviewSummary extends StatelessWidget {
   final ReviewStatsModel stats;
@@ -24,27 +114,10 @@ class ReviewSummary extends StatelessWidget {
       child: Row(
         crossAxisAlignment: CrossAxisAlignment.center,
         children: [
-          // Left: average rating + stars + count
-          Column(
-            mainAxisSize: MainAxisSize.min,
-            children: [
-              Text(
-                stats.averageRating.toStringAsFixed(1),
-                style: const TextStyle(
-                  fontSize: 40,
-                  fontWeight: FontWeight.bold,
-                  color: Color(0xFF1E293B),
-                  height: 1.1,
-                ),
-              ),
-              const SizedBox(height: 4),
-              StarDisplay(rating: stats.averageRating, size: 18),
-              const SizedBox(height: 4),
-              Text(
-                '${stats.reviewCount} review${stats.reviewCount == 1 ? '' : 's'}',
-                style: const TextStyle(fontSize: 12, color: Color(0xFF64748B)),
-              ),
-            ],
+          // Left: circular rating ring
+          _RatingRingWidget(
+            rating: stats.averageRating,
+            reviewCount: stats.reviewCount,
           ),
           const SizedBox(width: 24),
           // Right: distribution bars