feat(vlm): sort versions by newest first in VLM view, with disabled sort dropdown

When viewing all versions of a model (VLM mode via 'x versions' button):
- Backend always sorts by version ID descending, ignoring current sort_by
- A temporary 'Newest version first' option is injected into the sort
  dropdown (removed on exit, not a permanent option)
- The sort dropdown is disabled (greyed out) while VLM is active
- On clearing VLM, the previous sort preference is restored and the
  dropdown re-enabled
- Handles stale VLM state (e.g. after page reload with leftover session)
- Covers all three model page types: loras, checkpoints, embeddings

Also fixes review nits:
- Correct i18n call pattern (defaultValue in options object)
- Shared _restoreSortAfterVlm() helper to avoid triple duplication

locales/ko.json

@@ -682,7 +682,8 @@
                 "usageAsc": "적은 순",
                 "versionsCount": "로컬 버전 수",
                 "versionsCountDesc": "버전 수 많은 순",
-                "versionsCountAsc": "버전 수 적은 순"
+                "versionsCountAsc": "버전 수 적은 순",
+                "versionIdDesc": "최신 버전순"
             },
             "refresh": {
                 "title": "모델 목록 새로고침",