Enhance loading feedback: add loading animation for Assistant replies, improve TUI message updates, and refine response handling logic. Update README to reflect roadmap progress.

crates/owlen-tui/src/ui.rs

@@ -377,10 +377,23 @@ fn render_messages(frame: &mut Frame<'_>, area: Rect, app: &mut ChatApp) {
         let indent = if show_role_labels { "  " } else { "" };
 
         if show_role_labels {
-            lines.push(Line::from(Span::styled(
+            let mut role_spans = vec![Span::styled(
                 prefix,
                 role_color(role).add_modifier(Modifier::BOLD),
-            )));
+            )];
+
+            // Add loading animation for Assistant if currently loading and this is the last message
+            if matches!(role, Role::Assistant) &&
+               app.get_loading_indicator() != "" &&
+               message_index == conversation.messages.len() - 1 &&
+               is_streaming {
+                role_spans.push(Span::styled(
+                    format!(" {}", app.get_loading_indicator()),
+                    Style::default().fg(Color::Yellow),
+                ));
+            }
+
+            lines.push(Line::from(role_spans));
         }
 
         for (i, line) in formatted.iter().enumerate() {
@@ -397,6 +410,26 @@ fn render_messages(frame: &mut Frame<'_>, area: Rect, app: &mut ChatApp) {
         }
     }
 
+    // Add loading indicator ONLY if we're loading and there are no messages at all,
+    // or if the last message is from the user (no Assistant response started yet)
+    let last_message_is_user = conversation.messages.last()
+        .map(|msg| matches!(msg.role, Role::User))
+        .unwrap_or(true);
+
+    if app.get_loading_indicator() != "" && last_message_is_user {
+        let loading_spans = vec![
+            Span::styled(
+                "🤖 Assistant:",
+                Style::default().fg(Color::LightMagenta).add_modifier(Modifier::BOLD),
+            ),
+            Span::styled(
+                format!(" {}", app.get_loading_indicator()),
+                Style::default().fg(Color::Yellow),
+            ),
+        ];
+        lines.push(Line::from(loading_spans));
+    }
+
     if lines.is_empty() {
         lines.push(Line::from("No messages yet. Press 'i' to start typing."));
     }