fix(messages): merge partial WS updates + display edited content

message_updated broadcasts only {id, edited_content, edited_at} (+ reset
ai_* fields), but the frontend replaced the whole cached record, wiping
username/content/channel_id/created_at -> blank cards and the
'the channel_id of undefined' crash on /messages. Merge partials over the
existing record (list + detail), make list-patching channel-filter aware,
show edited content/badge, and fix the message_updated WS type.

Also broadcast type:'edited' + ai reset in message_updated so the live UI
matches the DB update.

services/discord-gateway/src/modules/message-capture/messageCapture.ts

@@ -343,6 +343,20 @@ export function registerMessageCapture(client: Client): void {
             id: newMessage.id,
             edited_content: getDisplayContent(newMessage as Message),
             edited_at: editedAt,
+            type: "edited",
+            // Match the DB update (updateMessageAsEdited resets analysis to
+            // pending) so the live UI reflects the same state instead of
+            // lingering on the stale pre-edit verdict.
+            ai_status: "pending",
+            ai_moderation_flags: null,
+            ai_moderation_score: null,
+            ai_analysis: null,
+            ai_categories: null,
+            ai_severity: null,
+            ai_confidence: null,
+            ai_recommended_action: null,
+            ai_analyzed_at: null,
+            ai_error: null,
           });
         }
       } else if (newMessage.author) {