SMART: detect drives whose firmware rejects the self-test log (WD SN580) and hide the test buttons with an explanation

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>

web/src/Disks.tsx

@@ -62,10 +62,11 @@ function SmartPanel({ dev, rotational }: { dev: string; rotational: boolean }) {
           </tbody>
         </table>
       )}
-      <div className="svc-actions">
+      {!s.self_test_supported && <div className="muted small">Self-tests: {s.self_test_note || 'not available on this drive'}.</div>}
+      {s.self_test_supported && <div className="svc-actions">
         <Btn className="btn" confirm={`Start a short self-test on ${dev}?`} onClick={async () => { if (await api.smartTest(dev, 'short').then(() => true, (e) => { toast(String(e.message ?? e), 'err'); return false })) { toast('short test started'); load(true) } }}>Short test</Btn>
         <Btn className="btn" confirm={`Start a long self-test on ${dev}? ${rotational ? 'This can take hours on a spinning disk.' : ''}`} onClick={async () => { if (await api.smartTest(dev, 'long').then(() => true, (e) => { toast(String(e.message ?? e), 'err'); return false })) { toast('long test started'); load(true) } }}>Long test</Btn>
-      </div>
+      </div>}
     </div>
   )
 }