Refactor TUI message formatting: add role label toggle, improve indentation, and adjust role label styling logic. Optimize provider handling.

crates/owlen-core/src/formatting.rs

@@ -30,6 +30,11 @@ impl MessageFormatter {
         self.wrap_width = width.max(20);
     }
 
+    /// Whether role labels should be shown alongside messages
+    pub fn show_role_labels(&self) -> bool {
+        self.show_role_labels
+    }
+
     pub fn format_message(&self, message: &Message) -> Vec<String> {
         // 1) Normalize line breaks to '\n' (handles CR, NEL, LS, PS)
         let normalized: String = message

crates/owlen-tui/src/chat_app.rs

@@ -154,7 +154,7 @@ impl ChatApp {
         self.models = all_models;
 
         // Populate available_providers
-        let mut providers = self
+        let providers = self
             .models
             .iter()
             .map(|m| m.provider.clone())
@@ -410,7 +410,7 @@ impl ChatApp {
             self.models = all_models;
 
             // Populate available_providers
-            let mut providers = self
+            let providers = self
                 .models
                 .iter()
                 .map(|m| m.provider.clone())

crates/owlen-tui/src/ui.rs

@@ -68,27 +68,33 @@ fn render_messages(frame: &mut Frame<'_>, area: Rect, app: &ChatApp) {
 
     let mut lines: Vec<Line> = Vec::new();
     for (message_index, message) in conversation.messages.iter().enumerate() {
-        let (prefix, color) = match message.role {
-            Role::User => ("👤 You:", Color::LightBlue),
-            Role::Assistant => ("🤖 Assistant:", Color::LightMagenta),
-            Role::System => ("⚙️ System:", Color::Cyan),
+        let role = &message.role;
+        let prefix = match role {
+            Role::User => "👤 You:",
+            Role::Assistant => "🤖 Assistant:",
+            Role::System => "⚙️ System:",
         };
 
-        let mut formatted = formatter.format_message(message);
+        let formatted = formatter.format_message(message);
         let is_streaming = message
             .metadata
             .get("streaming")
             .and_then(|v| v.as_bool())
             .unwrap_or(false);
 
-        lines.push(Line::from(Span::styled(
-            prefix,
-            Style::default().fg(color).add_modifier(Modifier::BOLD),
-        )));
+        let show_role_labels = formatter.show_role_labels();
+        let indent = if show_role_labels { "  " } else { "" };
+
+        if show_role_labels {
+            lines.push(Line::from(Span::styled(
+                prefix,
+                role_color(role).add_modifier(Modifier::BOLD),
+            )));
+        }
 
         for (i, line) in formatted.iter().enumerate() {
             let mut spans = Vec::new();
-            spans.push(Span::raw(format!("  {}", line.clone())));
+            spans.push(Span::raw(format!("{indent}{line}")));
             if i == formatted.len() - 1 && is_streaming {
                 spans.push(Span::styled(" ▌", Style::default().fg(Color::Magenta)));
             }
@@ -359,7 +365,7 @@ fn centered_rect(percent_x: u16, percent_y: u16, area: Rect) -> Rect {
         .split(vertical[1])[1]
 }
 
-fn role_color(role: Role) -> Style {
+fn role_color(role: &Role) -> Style {
     match role {
         Role::User => Style::default().fg(Color::LightBlue),
         Role::Assistant => Style::default().fg(Color::LightMagenta),