Restore reactions, add constraint, handle errors

Restore soft-deleted message reactions and enforce uniqueness only for active reactions; add WebSocket error handling and minor UI/Docker tweaks.

- backend/social/chat/models.py: Toggle reaction now restores a stale soft-deleted MessageReaction (avoids unique conflicts) and creates new reactions as needed. Replaced unique_together with a conditional UniqueConstraint that applies only to non-deleted records.
- backend/social/chat/consumers.py: Wrap reaction toggle in try/except to return a WS error message on failure instead of allowing exceptions to bubble up.
- frontend/src/components/social/chat/Message.tsx: Adjusted Tailwind max-width class for the reaction menu (max-w-32).
- docker-compose.yml: Added commented example configuration for an optional Janus media server (documentational/commented service).

These changes prevent unique constraint errors when restoring reactions, improve robustness of the WebSocket reaction flow, and include small UI and deployment notes.

backend/social/chat/consumers.py

@@ -74,11 +74,16 @@ class ChatConsumer(AsyncWebsocketConsumer):
             })
 
         elif msg_type == "reaction":
-            action, reaction = await _toggle_reaction(
-                message_id=data["message_id"],
-                user=user,
-                emoji=data["emoji"],
-            )
+            try:
+                action, _reaction = await _toggle_reaction(
+                    message_id=data["message_id"],
+                    user=user,
+                    emoji=data["emoji"],
+                )
+            except Exception:
+                await self.send(text_data=json.dumps({"error": "Reaction failed."}))
+                return
+            
             await self.channel_layer.group_send(self.chat_name, {
                 "type": "message.reaction",
                 "message_id": data["message_id"],