feat(threads): add editing, moderation retry, and emoji reactions

Add API routes and UI for editing threads and messages
Allow users to retry AI moderation for failed messages
Migrate thread reactions to use native emojis
Implement frontend search filtering for thread list

backend/src/aiModeration.ts

@@ -772,12 +772,47 @@ async function updateTargetStatus(
       if (status === 'approved') {
         await applyApprovedThreadMessage(target.id);
       } else {
-        const row = await queryOne<{ threadId: number }>(
-          'SELECT thread_id AS "threadId" FROM thread_messages WHERE id = $1',
+        const row = await queryOne<{
+          threadId: number;
+          body: string;
+          moderationStatus: AiModerationStatus;
+          moderationLanguageCode: string | null;
+          moderationReason: string | null;
+          createdAt: Date;
+          updatedAt: Date;
+          author: { id: number; displayName: string } | null;
+        }>(
+          `
+            SELECT
+              tm.thread_id AS "threadId",
+              tm.body,
+              tm.ai_moderation_status AS "moderationStatus",
+              tm.ai_moderation_language_code AS "moderationLanguageCode",
+              tm.ai_moderation_reason AS "moderationReason",
+              tm.created_at AS "createdAt",
+              tm.updated_at AS "updatedAt",
+              CASE WHEN u.id IS NULL THEN NULL ELSE json_build_object('id', u.id, 'displayName', u.display_name) END AS author
+            FROM thread_messages tm
+            LEFT JOIN users u ON u.id = tm.created_by_user_id
+            WHERE tm.id = $1
+              AND tm.deleted_at IS NULL
+          `,
           [target.id]
         );
         if (row) {
-          await publishThreadMessageModeration(row.threadId, null);
+          await publishThreadMessageModeration(row.threadId, target.id, {
+            id: target.id,
+            threadId: row.threadId,
+            body: row.body,
+            moderationStatus: row.moderationStatus,
+            moderationLanguageCode: row.moderationLanguageCode,
+            moderationReason: row.moderationReason,
+            createdAt: row.createdAt,
+            updatedAt: row.updatedAt,
+            author: row.author,
+            reactionCounts: {},
+            myReactions: []
+          });
         }
       }
       return;