Add feed engagement lenses, prompts, and ghost reputation

Author: Emiloart

apps/mobile/lib/features/feed/data/feed_repository.dart

@@ -83,7 +83,8 @@ class FeedRepository {
     final posts = rows.map(ShadePost.fromMap).toList(growable: false);
     final hasMore = posts.length > limit;
     final visiblePosts = hasMore ? posts.sublist(0, limit) : posts;
-    final hydratedPosts = await _attachPollMetadata(visiblePosts);
+    final postsWithPolls = await _attachPollMetadata(visiblePosts);
+    final hydratedPosts = await _attachReplyCounts(postsWithPolls);
 
     return FeedBatch(
       items: hydratedPosts,
@@ -212,6 +213,58 @@ class FeedRepository {
         )
         .toList(growable: false);
   }
+
+  Future<List<ShadePost>> _attachReplyCounts(List<ShadePost> posts) async {
+    if (posts.isEmpty) {
+      return posts;
+    }
+
+    final postIds = posts
+        .map((ShadePost post) => post.id)
+        .where((String id) => id.isNotEmpty)
+        .toList(growable: false);
+    if (postIds.isEmpty) {
+      return posts;
+    }
+
+    List<Map<String, dynamic>> replyRows;
+    try {
+      final result = await _client
+          .from('replies')
+          .select('id, post_id')
+          .inFilter('post_id', postIds)
+          .limit(5000);
+      replyRows = (result as List<dynamic>)
+          .map(
+            (dynamic item) => Map<String, dynamic>.from(item as Map),
+          )
+          .toList(growable: false);
+    } catch (_) {
+      return posts;
+    }
+
+    if (replyRows.isEmpty) {
+      return posts;
+    }
+
+    final countsByPostId = <String, int>{};
+    for (final row in replyRows) {
+      final postId = row['post_id'] as String?;
+      if (postId == null || postId.isEmpty) {
+        continue;
+      }
+      countsByPostId.update(postId, (int value) => value + 1,
+          ifAbsent: () => 1);
+    }
+
+    return posts
+        .map(
+          (ShadePost post) => post.copyWith(
+            replyCount: countsByPostId[post.id] ?? 0,
+          ),
+        )
+        .toList(growable: false);
+  }
 }
 
 List<String> _asStringList(dynamic value) {

apps/mobile/lib/features/feed/presentation/community_feed_screen.dart

@@ -595,7 +595,7 @@ class _FeedPostCard extends StatelessWidget {
                 InkWell(
                   onTap: onOpenReplies,
                   borderRadius: BorderRadius.circular(20),
-                  child: const Padding(
+                  child: Padding(
                     padding: EdgeInsets.symmetric(
                       horizontal: 4,
                       vertical: 2,
@@ -609,14 +609,29 @@ class _FeedPostCard extends StatelessWidget {
                         ),
                         SizedBox(width: 6),
                         Text(
-                          'Reply',
+                          '${post.replyCount} replies',
                           style: TextStyle(color: Colors.white70),
                         ),
                       ],
                     ),
                   ),
                 ),
                 const SizedBox(width: 14),
+                Icon(
+                  Icons.local_fire_department_rounded,
+                  size: 16,
+                  color: _heatAccent(post),
+                ),
+                const SizedBox(width: 4),
+                Text(
+                  _heatLabel(post),
+                  style: TextStyle(
+                    color: _heatAccent(post),
+                    fontSize: 12,
+                    fontWeight: FontWeight.w700,
+                  ),
+                ),
+                const SizedBox(width: 14),
                 const Icon(
                   Icons.visibility_outlined,
                   size: 16,
@@ -821,6 +836,35 @@ String _compactTime(String value) {
   return '${diff.inDays}d';
 }
 
+String _heatLabel(ShadePost post) {
+  final score =
+      (post.likeCount * 4) + (post.replyCount * 6) + (post.viewCount ~/ 12);
+  if (score >= 120) {
+    return 'Exploding';
+  }
+  if (score >= 75) {
+    return 'Trending';
+  }
+  if (score >= 40) {
+    return 'Rising';
+  }
+  return 'Fresh';
+}
+
+Color _heatAccent(ShadePost post) {
+  final label = _heatLabel(post);
+  switch (label) {
+    case 'Exploding':
+      return const Color(0xFFFACC15);
+    case 'Trending':
+      return const Color(0xFFFF2D55);
+    case 'Rising':
+      return const Color(0xFF38BDF8);
+    default:
+      return const Color(0xFF2DD4BF);
+  }
+}
+
 enum _PostAction {
   report,
   blockAuthor,