fix(playlists): Smart Playlist editor theme, toggles, and exclude-all-genres (#970)

* fix(playlists): Smart Playlist editor theme, toggles, and exclude-all-genres

Replace native sort select with CustomSelect, fix mode-button layout shift,
color-code included vs excluded genres, collapse exclude-all to untagged rule,
and handle empty smart playlists without false "not found".

* docs: CHANGELOG and credits for Smart Playlist editor fix (PR #970)

* chore(credits): drop minor fix entries from PR #958 onward

src/hooks/usePendingSmartPolling.ts

@@ -72,7 +72,11 @@ export function usePendingSmartPolling(
           // Wait until we see actual content and cover changed from the first placeholder-ish cover.
           // Fallback timeout keeps UI from waiting forever on servers that never update cover id.
           const hardTimeoutReached = item.attempts >= 18; // ~3 minutes (18 * 10s)
-          const ready = songCount > 0 && (!placeholderStillThere || hardTimeoutReached);
+          const emptySettled = songCount === 0 && item.attempts >= 3; // ~30s — valid empty result
+          const ready =
+            hardTimeoutReached
+            || emptySettled
+            || (songCount > 0 && (!placeholderStillThere || hardTimeoutReached));
           if (!ready) {
             next.push({
               ...item,