Chore: FCM Push Fixes (#934)

app/views/api/v1/accounts/notifications/index.json.jbuilder

@@ -0,0 +1,18 @@
+json.data do
+  json.meta do
+    json.unread_count @unread_count
+  end
+
+  json.payload do
+    json.array! @notifications do |notification|
+      json.id notification.id
+      json.notification_type notification.notification_type
+      json.push_message_title notification.push_message_title
+      json.primary_actor notification.primary_actor&.push_event_data
+      json.read_at notification.read_at
+      json.secondary_actor notification.secondary_actor&.push_event_data
+      json.user notification.user&.push_event_data
+      json.created_at notification.created_at.to_i
+    end
+  end
+end