fix(ci): regen model catalog + stop gui tests consuming macos-fixup subprocess calls (#36687)

Two pre-existing failures on main, unrelated to each other:

- test_model_catalog: website/static/api/model-catalog.json was stale vs
  _PROVIDER_MODELS — minimax/minimax-m2.7 was renamed to minimax/minimax-m3
  without regenerating the committed manifest. Ran scripts/build_model_catalog.py.

- test_gui_command: the macOS relaunchable-signing fixup
  (_desktop_macos_relaunchable_fixup) makes two subprocess.run calls (xattr +
  codesign) on darwin before launch. The two darwin GUI tests set
  sys.platform='darwin' and mock subprocess.run with a 2-element side_effect
  (pack + launch), so the fixup's calls drained the iterator -> StopIteration.
  Mock out the fixup in those two tests so the subprocess accounting stays
  focused on pack/launch.

website/static/api/model-catalog.json

@@ -1,6 +1,6 @@
 {
   "version": 1,
-  "updated_at": "2026-05-31T03:27:32Z",
+  "updated_at": "2026-06-01T08:20:18Z",
   "metadata": {
     "source": "hermes-agent repo",
     "docs": "https://hermes-agent.nousresearch.com/docs/reference/model-catalog"
@@ -77,7 +77,7 @@
           "description": "recommended"
         },
         {
-          "id": "minimax/minimax-m2.7",
+          "id": "minimax/minimax-m3",
           "description": ""
         },
         {
@@ -178,7 +178,7 @@
           "id": "moonshotai/kimi-k2.6"
         },
         {
-          "id": "minimax/minimax-m2.7"
+          "id": "minimax/minimax-m3"
         },
         {
           "id": "z-ai/glm-5.1"