Keep not-allowed cursor on disabled SearchSelect input

Excluding the inner search box from the global disabled rule also dropped its
cursor: not-allowed, so the pointer flickered between not-allowed (wrapper) and
the text I-beam (input) when moving across the disabled widget. Add
disabled:cursor-not-allowed to the search input so the cursor stays consistent.

e2e: assert the disabled inner input computes cursor: not-allowed.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

games/static/base.css

@@ -3430,6 +3430,11 @@
       outline-style: none;
     }
   }
+  .disabled\:cursor-not-allowed {
+    &:disabled {
+      cursor: not-allowed;
+    }
+  }
   .has-\[\:disabled\]\:cursor-not-allowed {
     &:has(*:is(:disabled)) {
       cursor: not-allowed;