Change stop key to 's' for better compatibility

- Replace Shift+Space with 's' key for stop functionality
- Update status bar shortcuts to reflect the change
- Bump version to 0.1.5

src/main.rs

@@ -227,8 +227,8 @@ async fn handle_key_event<B: ratatui::backend::Backend>(terminal: &mut Terminal<
                 tracing::info!("Playing: {:?} (playlist: {} tracks)", path, state.playlist.len());
             }
         }
-        (KeyCode::Char(' '), KeyModifiers::SHIFT) => {
-            // Shift+Space: Stop playback
+        (KeyCode::Char('s'), _) => {
+            // s: Stop playback
             state.player_state = PlayerState::Stopped;
             state.current_position = 0.0;
             state.current_duration = 0.0;