feat: advanced filename templates, low-RAM device profiling, responsive artist UI, and project site

- Add advanced filename template placeholders: {track_raw}, {disc_raw}, {date},
  formatted numbers {track:N}/{disc:N}, and date formatting {date:%Y-%m-%d}
  with strftime-to-Go layout conversion and robust date parser
- Pass date/release_date metadata to filename builder in all providers
  (Amazon, Qobuz, Tidal, YouTube, extensions) and Flutter download queue
- Detect ARM32-only / low-RAM Android devices at startup and reduce image
  cache size and disable overscroll effects for smoother experience
- Make artist screen selection bar responsive: compact stacked layout on
  narrow screens or large text scale; add quality picker before track download
- Add advanced tags toggle in download settings filename format editor
- Fix ICU plural syntax in DE/ES/PT/RU translations (one {}=1{...} -> one {...})
- Add filenameShowAdvancedTags l10n strings (EN, ID) and regenerate dart files
- Fix featured-artist regex: remove '&' from split separators
- Add Go filename template tests (filename_test.go)
- Add GitHub Pages workflow and static project site

lib/providers/download_queue_provider.dart

@@ -1304,7 +1304,7 @@ class DownloadQueueNotifier extends Notifier<DownloadQueueState> {
   }
 
   static final _featuredArtistPattern = RegExp(
-    r'\s*[,;&]\s*|\s+(?:feat\.?|ft\.?|featuring|with|x)\s+',
+    r'\s*[,;]\s*|\s+(?:feat\.?|ft\.?|featuring|with|x)\s+',
     caseSensitive: false,
   );
 
@@ -2813,6 +2813,7 @@ class DownloadQueueNotifier extends Notifier<DownloadQueueState> {
               'track': trackToDownload.trackNumber ?? 0,
               'disc': trackToDownload.discNumber ?? 0,
               'year': _extractYear(trackToDownload.releaseDate) ?? '',
+              'date': trackToDownload.releaseDate ?? '',
             });
         final sanitized = await PlatformBridge.sanitizeFilename(baseName);
         safBaseName = sanitized;