Select thinking mode from the chat

src/app/view/chat.rs

@@ -305,6 +305,19 @@ impl App {
                 .text_size(12)
                 .padding([2, 6])
             });
+            let reasoning_mode = self.config.generation.effective_reasoning_mode();
+            let reasoning_control: Element<'_, Message> = if self.active_chat_count() > 0 {
+                text(reasoning_mode.to_string()).size(12).into()
+            } else {
+                pick_list(
+                    self.config.generation.supported_reasoning_modes(),
+                    Some(reasoning_mode),
+                    Message::ReasoningModeChanged,
+                )
+                .text_size(12)
+                .padding([2, 6])
+                .into()
+            };
             composer_content =
                 composer_content.push(
                     row![
@@ -341,6 +354,7 @@ impl App {
                         )
                         .text_size(12)
                         .padding([2, 6]),
+                        reasoning_control,
                         icon(ICON_MODEL, 16),
                         text(self.config.model.to_string()).size(12),
                         action,