Inbox: drop the Microsoft Graph API status chip from the header

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

frontend/src/screens/Inbox.jsx

@@ -1122,9 +1122,6 @@ export default function Inbox() {
               </button>
             ))}
           </div>
-          {!isForms && (
-            <span className="integration-status"><span className="pulse" />Microsoft Graph API · Connected</span>
-          )}
           {isForms && (
             <span className="integration-status"><span className="pulse" />Google Sheets · Form data</span>
           )}