feat: comprehensive UX improvements — messages, analysis, moderation

Fix #1 (CRITICAL): Wire message_analyzed through Redis EventBroadcaster
- DG aiAnalyzer.ts: Add broadcastAnalysisCompleted() helper that publishes
  to both in-memory WS broadcaster AND Redis EventBroadcaster
- DG bootstrap.ts: Pass eventBroadcaster to startPendingAIAnalysisWorker()
- Fixes broken real-time chain so analysis results appear instantly

Fix #2: Collapsible AI Analysis with Rich Formatting
- MessageCard: AI analysis now collapsible with color-coded severity border
  (red/yellow/blue), summary line showing categories + confidence + severity
- Default collapsed for clean, expanded for warn/flagged

Fix #3: Toast Notifications for Flagged Content
- Wrap app in ToastProvider; ModerationAlertListener component listens for
  moderation_alert custom events and shows toast with emoji + details

Fix #4: Discord-style Message Grouping
- MessageFeed: Group consecutive messages from same user within 5 min
- MessageCard: Compact variant hides avatar, reduces padding for non-first

Fix #5: Moderation Action Buttons in UI
- BE: POST /api/messages/:id/moderate endpoint + publishCommand() for Redis
- FE: Delete/Warn buttons on flagged/warned cards with confirmation dialog

Fix #6: Search Results Include Full Data
- BE analysis.service.ts: SELECT all 26 message columns instead of just 11
- Search results now render with full MessageCard including images/analysis

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

services/frontend/src/App.tsx

@@ -4,6 +4,7 @@ import { LivePanel } from "./features/live";
 import { useMediaControl } from "./features/live/hooks/useMediaControl";
 import { useVoiceControl } from "./features/live/hooks/useVoiceControl";
 import { MessagesPanel } from "./features/messages";
+import { ModerationAlertListener } from "./features/messages/components/ModerationAlertListener";
 import {
   mergeMessages,
   useMessages,
@@ -93,8 +94,25 @@ export default function App() {
         ),
       );
     },
-    onMessageAnalyzed: (m) =>
-      messages.setMessages((prev) => mergeMessages(prev, [m as MessageRecord])),
+    onMessageAnalyzed: (m) => {
+      const msg = m as MessageRecord;
+      messages.setMessages((prev) => mergeMessages(prev, [msg]));
+      // Show toast for moderation alerts (warn/flagged)
+      const status = msg.ai_status;
+      if (status === "flagged" || status === "warn") {
+        const username = msg.username || msg.user_id || "unknown";
+        const severity = msg.ai_severity || "";
+        const categories = msg.ai_categories || "";
+        const brief =
+          msg.ai_analysis?.slice(0, 80) ??
+          `Message ${status === "flagged" ? "flagged" : "warned"} by AI`;
+        window.dispatchEvent(
+          new CustomEvent("moderation_alert", {
+            detail: { type: status, username, severity, categories, brief },
+          }),
+        );
+      }
+    },
     onAttachmentUploaded: () =>
       messages
         .fetchMessages(monitorGuildId || undefined)
@@ -216,6 +234,7 @@ export default function App() {
         activeTab={activeTab}
         onTabChange={(tab) => patchUIState({ activeTab: tab })}
       />
+      <ModerationAlertListener />
     </DashboardLayout>
   );
 }