fix: system settings — show description as title, key as small monospace hint

components/SystemSettings.js

@@ -290,16 +290,16 @@ function SettingRow({ row, onSaved }) {
       <div className="flex items-start justify-between flex-wrap gap-2 mb-2">
         <div className="min-w-0">
           <div className="flex items-center gap-2">
-            <code className="text-sm font-mono">{row.key}</code>
+            <span className="text-sm font-medium text-gray-800 dark:text-gray-200">
+              {row.description || row.key}
+            </span>
             {isSecret && (
               <span className="text-[10px] uppercase tracking-wide px-1.5 py-0.5 rounded bg-amber-500/15 text-amber-500">
                 secret
               </span>
             )}
           </div>
-          {row.description && (
-            <p className="text-xs text-gray-500 mt-1">{row.description}</p>
-          )}
+          <code className="text-[11px] text-gray-400 font-mono mt-0.5">{row.key}</code>
         </div>
       </div>
       <div className="flex items-center gap-2">