Add Media.Dropzone and Media.Preview as isolated elements

Introduce `Media.*` to modularize and customize file upload handling. Refactor media-related components to improve usability, add max item limits, overwrite support, and event callbacks.

app/src/ui/client/api/use-entity.ts

@@ -143,6 +143,8 @@ export const useEntityQuery = <
    return {
       ...swr,
       ...mapped,
+      mutate: mutateAll,
+      mutateRaw: swr.mutate,
       api,
       key
    };