Use small triangle arrow for playlist playing indicator

Replace large arrow with small triangle (▸) to match the style
used for directory indicators before nerd fonts were introduced.

src/ui/mod.rs

@@ -322,7 +322,7 @@ fn render_right_panel(frame: &mut Frame, state: &mut AppState, area: Rect, _tab_
             let is_playing = idx == state.playlist_index;
 
             // Add playing indicator arrow
-            let indicator = if is_playing { "▶ " } else { "  " };
+            let indicator = if is_playing { "▸ " } else { "  " };
 
             // Build line with search highlighting if searching
             let mut line_spans = vec![Span::raw(indicator)];