feat: rewrite image picker (#6556)

* feat: rewrite image picker

* style: auto-fix lint and format

* fix: address image picker review

* fix: preserve unicode icon searches

* test: stabilize custom widget login

* fix: suggest image searches only on create

apps/docs/docs/management/apps/index.mdx

@@ -28,7 +28,7 @@ The name must be at least one character long and can be chosen freely.
 ### Icon URL
 
 This is the URL to the icon that will be displayed on the app widget.
-You can paste a direct HTTP(S) URL to an image, search the included icon repositories by name, or upload a local file through the upload button. Direct image URLs are used as entered and are not searched in the icon repositories.
+You can paste a direct HTTP(S) URL to an image, search the included icon repositories by name, or upload a local file through the upload button. The app name is pre-filled as the initial library search when no image is selected. Local images appear first, followed by SVG icons and other formats. Direct image URLs are previewed, used as entered, and are not searched in the icon repositories.
 
 ![Icon URL](./img/app-icon-url.png)