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/widgets/AppShell.module.css

@@ -1,7 +1,8 @@
 .shell {
+  --side-w: 240px;
   position: relative;
   display: grid;
-  grid-template-columns: 240px 1fr;
+  grid-template-columns: var(--side-w) 1fr;
   grid-template-rows: 60px 1fr 88px;
   grid-template-areas:
     'top top'
@@ -234,7 +235,7 @@
 
 @media (max-width: 1023px) {
   .shell {
-    grid-template-columns: 72px 1fr;
+    --side-w: 72px;
   }
 
   .navItem {
@@ -269,6 +270,7 @@
 
 @media (max-width: 767px) {
   .shell {
+    --side-w: 0px;
     grid-template-columns: 1fr;
     grid-template-rows: 60px 1fr 72px 64px;
     grid-template-areas: