Show stored pubkey in Settings when profile not loaded (debug)

Co-authored-by: shakespeare.diy <assistant@shakespeare.diy>

src/pages/SettingsPage.tsx

@@ -143,6 +143,9 @@ function ProfileTab() {
                   <strong>Profile not loaded.</strong> Your profile data wasn't found on the configured relays. 
                   Try refreshing or make sure you've published your profile.
                 </p>
+                <p className="text-xs text-yellow-400 mt-1 font-mono break-all">
+                  Logged in as: {user.pubkey}
+                </p>
               </div>
               <Button
                 onClick={handleRefreshProfile}