Add missing anchor clear test case

src/platform/assets/composables/useAssetSelection.test.ts

@@ -67,4 +67,23 @@ describe('useAssetSelection', () => {
     expect(store.lastSelectedIndex).toBe(1)
     expect(store.lastSelectedAssetId).toBe('a')
   })
+
+  it('clears anchor when the anchored asset is no longer visible', () => {
+    const selection = useAssetSelection()
+    const store = useAssetSelectionStore()
+    const assets: AssetItem[] = [
+      { id: 'a', name: 'a.png', tags: [] },
+      { id: 'b', name: 'b.png', tags: [] }
+    ]
+
+    store.setSelection(['a', 'b'])
+    store.setLastSelectedIndex(0)
+    store.setLastSelectedAssetId('a')
+
+    selection.reconcileSelection([assets[1]])
+
+    expect(Array.from(store.selectedAssetIds)).toEqual(['b'])
+    expect(store.lastSelectedIndex).toBe(-1)
+    expect(store.lastSelectedAssetId).toBeNull()
+  })
 })