Refactor API integration and enhance command handling

- Removed unused modules and updated module paths for clarity.
- Added autocomplete functionality for command input in InputState.
- Updated AppStateRest to include a method for checking if a turn is in flight.
- Refactored subagent engine to use new API client structure.
- Changed default provider from "openrouter" to "zen" with updated API keys and models.
- Implemented tests for memory management and edit log functionalities.
- Enhanced error handling in API requests and improved response parsing.
- Updated UI components to reflect new API provider and status indicators.

src/view/chat.rs

@@ -98,6 +98,17 @@ pub fn draw_chat(frame: &mut Frame, area: Rect, state: &crate::app::state::rest:
         display_lines.push(Line::from(Span::raw("")));
     }
 
+    if state.turn_in_flight() {
+        let last_is_user = messages.last().map(|m| matches!(m.role, crate::dto::chat::message::Role::User)).unwrap_or(false);
+        if last_is_user {
+            display_lines.push(Line::from(vec![
+                Span::styled(" AI ", Style::default().fg(Theme::BG).bg(Theme::ROLE_ASSISTANT).add_modifier(Modifier::BOLD)),
+                Span::styled(" Thinking...", Style::default().fg(Theme::DIM)),
+            ]));
+            display_lines.push(Line::from(Span::raw("")));
+        }
+    }
+
     if messages.len() > scroll_offset + max_visible {
         let below = messages.len().saturating_sub(scroll_offset + max_visible);
         display_lines.push(Line::from(Span::styled(