Add nerd font icons and UI polish

- Add nerd font file type icons:
  - Folder icons: closed/open folders with visual state
  - Music files: icon in green (mp3, flac, wav, ogg, etc.)
  - Video files: icon in yellow (mp4, mkv, avi, mov, etc.)
- Add spacing after icons for better readability

- Add "Refresh" option to title bar right-click menu
- Make all context menus more compact (13 chars wide)

- Change panel titles to lowercase:
  - "Media Files" → "files"
  - "Playlist" → "playlist"
- Remove bold styling from focused panel titles

- All icons show as bold black on selection bar
- Folders show in blue, music in green, video in yellow

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "cm-player"
-version = "0.1.13"
+version = "0.1.14"
 edition = "2021"
 
 [dependencies]

src/ui/mod.rs

@@ -147,16 +147,40 @@ fn render_file_panel(frame: &mut Frame, state: &mut AppState, area: Rect) {
             // Only show selection bar when file panel has focus
             let is_selected = !state.focus_playlist && idx == state.selected_index;
 
-            // Add folder icon for directories
+            // Add icon for directories and files
             let icon = if item.node.is_dir {
+                let is_expanded = state.expanded_dirs.contains(&item.node.path);
+                // Nerd font folder icons: \u{eaf7} = open, \u{ea83} = closed
+                let icon_char = if is_expanded { "\u{eaf7}  " } else { "\u{ea83}  " };
+
                 // Bold black icon on selection bar, blue otherwise
                 if is_selected {
-                    Span::styled("▸ ", Style::default().fg(Theme::background()).add_modifier(Modifier::BOLD))
+                    Span::styled(icon_char, Style::default().fg(Theme::background()).add_modifier(Modifier::BOLD))
                 } else {
-                    Span::styled("▸ ", Style::default().fg(Theme::highlight()))
+                    Span::styled(icon_char, Style::default().fg(Theme::highlight()))
                 }
             } else {
-                Span::raw("  ")
+                // File icons based on extension
+                let extension = item.node.path.extension()
+                    .and_then(|e| e.to_str())
+                    .unwrap_or("")
+                    .to_lowercase();
+
+                let (icon_char, color) = match extension.as_str() {
+                    // Audio files - music note icon
+                    "mp3" | "flac" | "wav" | "ogg" | "m4a" | "aac" | "wma" | "opus" =>
+                        ("\u{f0e2a}  ", Theme::success()), //
+                    // Video files - film icon
+                    "mp4" | "mkv" | "avi" | "mov" | "webm" | "flv" | "wmv" | "m4v" =>
+                        ("\u{f1c8}  ", Theme::warning()), //
+                    _ => ("   ", Theme::foreground()),
+                };
+
+                if is_selected {
+                    Span::styled(icon_char, Style::default().fg(Theme::background()).add_modifier(Modifier::BOLD))
+                } else {
+                    Span::styled(icon_char, Style::default().fg(color))
+                }
             };
             let name_spans = if in_search && !search_query.is_empty() {
                 highlight_search_matches(&item.node.name, &search_query, is_selected)
@@ -201,20 +225,13 @@ fn render_file_panel(frame: &mut Frame, state: &mut AppState, area: Rect) {
         items.push(more_item);
     }
 
-    let title_style = if !state.focus_playlist {
-        // File panel has focus - bold title
-        Theme::title_style().add_modifier(Modifier::BOLD)
-    } else {
-        Theme::title_style()
-    };
-
     let list = List::new(items)
         .block(
             Block::default()
                 .borders(Borders::ALL)
-                .title("Media Files")
+                .title("files")
                 .style(Theme::widget_border_style())
-                .title_style(title_style),
+                .title_style(Theme::title_style()),
         );
 
     let mut list_state = ListState::default();
@@ -311,16 +328,9 @@ fn render_right_panel(frame: &mut Frame, state: &mut AppState, area: Rect) {
     }
 
     let playlist_title = if !state.playlist.is_empty() {
-        format!("Playlist [{}/{}]", state.playlist_index + 1, state.playlist.len())
+        format!("playlist [{}/{}]", state.playlist_index + 1, state.playlist.len())
     } else {
-        "Playlist (empty)".to_string()
-    };
-
-    let playlist_title_style = if state.focus_playlist {
-        // Playlist has focus - bold title
-        Theme::title_style().add_modifier(Modifier::BOLD)
-    } else {
-        Theme::title_style()
+        "playlist (empty)".to_string()
     };
 
     let playlist_widget = List::new(playlist_items)
@@ -329,7 +339,7 @@ fn render_right_panel(frame: &mut Frame, state: &mut AppState, area: Rect) {
                 .borders(Borders::ALL)
                 .title(playlist_title)
                 .style(Theme::widget_border_style())
-                .title_style(playlist_title_style),
+                .title_style(Theme::title_style()),
         );
 
     let mut playlist_state = ListState::default();