feat(upload): enhance audio upload handling and user feedback

- Introduced a new warning for users uploading non-FLAC or WAV formats, indicating that these formats should only be used as a last resort.
- Added functionality to highlight files needing format attention in the upload queue.
- Updated the UI to provide clearer guidance on acceptable audio formats during uploads.
- Improved documentation to reflect changes in upload requirements and user interface updates.

apps/web/src/pages/uploads/uploads.module.css

@@ -25,6 +25,15 @@
   font-weight: 600;
 }
 
+.formatWarn {
+  max-width: 640px;
+  margin: 0;
+  font-size: 14px;
+  font-weight: 600;
+  line-height: 1.45;
+  color: var(--warn);
+}
+
 .dropActions {
   display: flex;
   flex-wrap: wrap;