fix(playlists): the list's name keeps its room on a narrow window

Below xl Unsynced is its dot; on a phone the cover is gone, Play all is its
glyph, the band's count is its number and the undo pair stays out. The name was
0 px wide in Hungarian at 768 and on any phone, and a tick moved the list there.

frontend/src/modules/playlists/SelectionBand.tsx

@@ -7,7 +7,8 @@ import { Button } from "../../components/ui/Button";
  *  `count` is the rows shown, what an action covers; `hidden` the selected ones a filter hides, which
  *  it leaves alone. With only hidden ones the actions stay in place, off, and the way out stays on.
  *  Below `xl` the buttons are glyphs named in their tooltips: in words the row wraps there, and the
- *  first tick would push the list from under the second tap. */
+ *  first tick would push the list from under the second tap. On a phone the count is its number and
+ *  the undo pair stays out, for the same one row. */
 export function SelectionBand({
   ref,
   count,
@@ -40,7 +41,16 @@ export function SelectionBand({
   return (
     <div ref={ref} className="flex items-center gap-1 mt-1 flex-wrap xl:gap-2">
       <span role="status" className="text-xs whitespace-nowrap">
-        <span className="font-medium">{t("playlists.selectedCount", { count })}</span>
+        <span className="sr-only font-medium sm:not-sr-only">
+          {t("playlists.selectedCount", { count })}
+        </span>
+        <span
+          aria-hidden="true"
+          title={t("playlists.selectedCount", { count })}
+          className="font-medium sm:hidden"
+        >
+          {count}
+        </span>
         {hidden > 0 && (
           <span className="text-muted">
             <span aria-hidden="true" className="hidden xl:inline">
@@ -117,7 +127,7 @@ export function SelectionBand({
           <span className="hidden xl:inline">{t("playlists.clearView")}</span>
         </Button>
       )}
-      <div className="ml-auto">{trailing}</div>
+      <div className="ml-auto hidden sm:block">{trailing}</div>
     </div>
   );
 }