Add Docker whale icon for docker images

Docker images now display with distinctive 🐋 whale icon in blue (highlight color) instead of status icons. This provides clear visual identification that these are docker images while not implying operational status.

dashboard/src/ui/widgets/services.rs

@@ -180,7 +180,7 @@ impl ServicesWidget {
         };
         let tree_symbol = if is_last { "└─" } else { "├─" };
 
-        // Docker images don't have status icons
+        // Docker images use docker whale icon
         if info.service_type == "image" {
             vec![
                 // Indentation and tree prefix
@@ -188,7 +188,12 @@ impl ServicesWidget {
                     format!("  {} ", tree_symbol),
                     Typography::tree(),
                 ),
-                // Service name (no icon for images)
+                // Docker whale icon
+                ratatui::text::Span::styled(
+                    "🐋 ".to_string(),
+                    Style::default().fg(Theme::highlight()).bg(Theme::background()),
+                ),
+                // Service name
                 ratatui::text::Span::styled(
                     format!("{:<18} ", short_name),
                     Style::default()