Design: Model management (#7190)

## Summary

Assorted updates to the components involved in uploading personal
models.

## Changes

- Standardize Import buttons
- Let the images fill the space on the card
- Order by recent by default
- Nicer display on the model select popover

┆Issue is synchronized with this [Notion
page](https://www.notion.so/PR-7190-Design-Model-management-2c06d73d365081e7b9fed7a83b730c0f)
by [Unito](https://www.unito.io)

src/platform/assets/components/AssetBrowserModal.vue

@@ -39,7 +39,7 @@
           :on-click="showUploadDialog"
         >
           <template #icon>
-            <i class="icon-[lucide--package-plus]" />
+            <i class="icon-[lucide--folder-input]" />
           </template>
         </IconTextButton>
       </div>