test: fix SingleSelect selector in AssetFilterBar test

Use findAllComponents with label filter to specifically find the sort
dropdown instead of the first SingleSelect, which could be the ownership
filter when mutable assets are present.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <[email protected]>

Author: luke-mino-altherr

tests-ui/platform/assets/components/AssetFilterBar.test.ts

@@ -105,8 +105,10 @@ describe('AssetFilterBar', () => {
       await nextTick()
 
       // Update sort
-      const sortSelect = wrapper.findComponent({ name: 'SingleSelect' })
-      await sortSelect.vm.$emit('update:modelValue', 'popular')
+      const sortSelect = wrapper
+        .findAllComponents({ name: 'SingleSelect' })
+        .find((component) => component.props('label') === 'assetBrowser.sortBy')
+      await sortSelect!.vm.$emit('update:modelValue', 'popular')
 
       await nextTick()