fix(download): use direct_url so filename keeps its extension (#130)

The REST migration mapped ApiImage.download.file_url -> ImageInfo.file_url,
but that field is the pretty mirror-selector URL (successor of the legacy
redi_url) without a file extension. Pre-migration the download pipeline
consumed the legacy file_url, which is now exposed as direct_url.

Passing direct_url restores the original behavior: the backend extracts a
filename with a proper extension, and decompression plus QDL extraction
work again.

Author: SuperKali

src/hooks/useFlashOperation.ts

@@ -275,7 +275,9 @@ export function useFlashOperation({
     }, POLLING.DOWNLOAD_PROGRESS);
 
     try {
-      const path = await downloadImage(image.file_url, image.sha_url);
+      // direct_url carries the full filename; file_url is the pretty
+      // mirror-selector URL (legacy redi_url) and has no extension.
+      const path = await downloadImage(image.direct_url, image.sha_url);
       setImagePath(path);
       if (intervalRef.current) clearInterval(intervalRef.current);
       startFlash(path);