feat(ui): show version count in group-by-model cards, add versions_count sort, no-reload VLM

- group_by_model dedup now counts versions per group and attaches
  version_count; respects update_flag_strategy (same_base) by
  sub-grouping on base_model
- Card footer shows clickable 'x versions' link instead of version
  name when grouped (hides HIGH/LOW badges); clicking triggers
  View Local Versions without page reload
- Added 'Local Versions' sort option (versions_count), auto-hidden
  when group_by_model is off
- Sort preference is saved/restored separately for normal and
  grouped modes
- VLM flow (triggerVlmView, clearCustomFilter) uses resetAndReload()
  via API instead of window.location.reload()
- Fixed cache mutation bug: version_count is now set on a shallow
  copy, not the cached dict, preventing stale version_count leaking
  into VLM responses
- i18n: all 9 locale files translated

static/js/components/shared/ModelVersionsTab.js

@@ -1042,9 +1042,16 @@ export function initVersionsTab({
             removeSessionItem('vlm_base_model');
         }
 
-        // Close the modal and reload the page to show filtered cards
+        // Close the modal and navigate via no-reload VLM flow
         modalManager.closeModal(modalId);
-        window.location.reload();
+        if (window.pageControls && typeof window.pageControls.triggerVlmView === 'function') {
+            window.pageControls.triggerVlmView(
+                modelId,
+                modelName || String(modelId),
+                isFilteringActive ? baseModelInfo.raw : undefined,
+                modelType
+            );
+        }
     }
 
     async function handleToggleVersionIgnore(button, versionId) {