chore: Enforce custom role permissions on conversation access (#12583)

## Summary
- ensure conversation lookup uses the permission filter before fetching
records
- add request specs covering custom role access to unassigned
conversations

## Testing
- bundle exec rspec
spec/enterprise/controllers/api/v1/accounts/conversations_controller_spec.rb

------
https://chatgpt.com/codex/tasks/task_e_68de1f62b9b883268a54882e608a8bb8

app/controllers/api/v1/accounts/conversations/base_controller.rb

@@ -5,6 +5,6 @@ class Api::V1::Accounts::Conversations::BaseController < Api::V1::Accounts::Base
 
   def conversation
     @conversation ||= Current.account.conversations.find_by!(display_id: params[:conversation_id])
-    authorize @conversation.inbox, :show?
+    authorize @conversation, :show?
   end
 end

app/controllers/api/v1/accounts/conversations_controller.rb

@@ -160,7 +160,7 @@ class Api::V1::Accounts::ConversationsController < Api::V1::Accounts::BaseContro
 
   def conversation
     @conversation ||= Current.account.conversations.find_by!(display_id: params[:id])
-    authorize @conversation.inbox, :show?
+    authorize @conversation, :show?
   end
 
   def inbox

app/controllers/api/v1/accounts/integrations/dyte_controller.rb

@@ -22,7 +22,7 @@ class Api::V1::Accounts::Integrations::DyteController < Api::V1::Accounts::BaseC
   private
 
   def authorize_request
-    authorize @conversation.inbox, :show?
+    authorize @conversation, :show?
   end
 
   def render_response(response)