fix(workflow): import Color style for improved agent state rendering

src/view/workflow.rs

@@ -9,7 +9,7 @@
 //! e.g. `"Node-0-1"`).
 
 use ratatui::layout::Rect;
-use ratatui::style::{Style, Modifier};
+use ratatui::style::{Color, Style, Modifier};
 use ratatui::text::{Line, Span};
 use ratatui::widgets::{Block, Borders, Paragraph, Wrap};
 use ratatui::Frame;
@@ -249,5 +249,3 @@ fn workflow_agent_line(agent: &WorkflowAgent) -> Line<'static> {
         Span::styled(agent.name.clone(), Style::default().fg(Theme::TEXT)),
     ])
 }
-
-use ratatui::style::Color;