fix(settings): deleted API key stays on screen until manual reload

The delete-API-key mutation called queryClient.invalidateQueries on the
  ['api-keys'] cache, which in react-query v5 should also refetch active
  queries — but in practice the deleted row remained visible until the
  user reloaded the page. Switched onSuccess to setQueryData so the
  deleted key is filtered out of the cache synchronously the moment the
  API confirms; no refetch round-trip required, no invalidation→refetch
  race possible. Create-path is unchanged (invalidateQueries was working
  there).

  Pins the contract with a new SettingsPage test that mocks the GET/DELETE
  endpoints, clicks delete, confirms, and asserts the row is gone without
  any reload.

static/index.html

@@ -26,7 +26,7 @@
 
     <!-- Splash screens for iOS -->
     <link rel="apple-touch-startup-image" href="/img/android-chrome-512x512.png" />
-    <script type="module" crossorigin src="/assets/index-JRaF_JhW.js"></script>
+    <script type="module" crossorigin src="/assets/index-DRS5LiBG.js"></script>
     <link rel="stylesheet" crossorigin href="/assets/index-telVPl_h.css">
   </head>
   <body>