Add dynamic title bar colors based on player state

Title bar background color changes:
- Gray: Stopped or Paused
- Green: Playing
- Red: Error (when last_error is set)

Main content border remains gray.

src/state/mod.rs

@@ -88,6 +88,7 @@ pub struct AppState {
     pub last_click_is_playlist: bool,
     pub context_menu: Option<ContextMenu>,
     pub play_mode: PlayMode,
+    pub last_error: Option<String>,
 }
 
 #[derive(Debug, Clone)]
@@ -141,6 +142,7 @@ impl AppState {
             last_click_is_playlist: false,
             context_menu: None,
             play_mode: PlayMode::Normal,
+            last_error: None,
         }
     }
 

src/ui/mod.rs

@@ -57,7 +57,7 @@ pub fn render(frame: &mut Frame, state: &mut AppState, player: &mut Player) -> (
         Span::styled(playlist_text, playlist_style),
     ]);
 
-    // Create one border around the entire content area
+    // Create one border around the entire content area with fixed gray border
     let main_block = Block::default()
         .borders(Borders::ALL)
         .title(title)
@@ -384,12 +384,17 @@ fn render_right_panel(frame: &mut Frame, state: &mut AppState, area: Rect, _tab_
 }
 
 fn render_title_bar(frame: &mut Frame, state: &AppState, player: &mut Player, area: Rect) {
-    // Default to stopped if we can't query MPV
+    // Get player state
     let player_state = player.get_player_state().unwrap_or(PlayerState::Stopped);
-    let background_color = match player_state {
+
+    // Title bar background color: red for error, gray for stopped/paused, green for playing
+    let background_color = if state.last_error.is_some() {
+        Theme::error()
+    } else {
+        match player_state {
             PlayerState::Playing => Theme::success(),     // Green for playing
-        PlayerState::Paused => Theme::highlight(),    // Blue for paused
+            PlayerState::Paused | PlayerState::Stopped => Theme::border(),    // Gray for paused/stopped
-        PlayerState::Stopped => Theme::dim_foreground(),   // Gray for stopped
+        }
     };
 
     // Split the title bar into left and right sections

src/ui/theme.rs

@@ -34,6 +34,10 @@ impl Theme {
         Color::Rgb(215, 175, 95) // #d7af5f
     }
 
+    pub fn normal_red() -> Color {
+        Color::Rgb(215, 95, 95) // #d75f5f
+    }
+
     // Semantic mappings
     pub fn secondary_text() -> Color {
         Self::foreground()
@@ -59,6 +63,10 @@ impl Theme {
         Self::normal_yellow()
     }
 
+    pub fn error() -> Color {
+        Self::normal_red()
+    }
+
     // Styles
     pub fn widget_border_style() -> Style {
         Style::default().fg(Self::border()).bg(Self::background())