fix(tui/agents): guard overlay clamp (fixes #478)

code-rs/tui/src/chatwidget.rs

@@ -35866,7 +35866,8 @@ impl ChatWidget<'_> {
             body_area.width
         } else {
             let max_allowed = body_area.width.saturating_sub(30).max(18);
-            desired_sidebar.clamp(24, max_allowed)
+            let min_allowed = 24.min(max_allowed);
+            desired_sidebar.clamp(min_allowed, max_allowed)
         };
 
         let constraints = if body_area.width <= sidebar_width {

code-rs/tui/tests/vt100_chatwidget_snapshot.rs

@@ -2324,6 +2324,16 @@ fn agent_status_missing_batch_displays_error() {
     insta::assert_snapshot!("agent_status_missing_batch_displays_error", output);
 }
 
+#[test]
+fn agents_overlay_narrow_terminal_does_not_panic() {
+    let mut harness = ChatWidgetHarness::new();
+    harness.send_key(make_key(KeyCode::Char('a'), KeyModifiers::CONTROL));
+
+    let output = render_chat_widget_to_vt100(&mut harness, 52, 18);
+    let output = normalize_output(output);
+    assert!(output.contains("Agents"), "Agents overlay did not render");
+}
+
 #[test]
 fn agents_toggle_claude_opus_persists_via_slash_command() {
     let _lock = ENV_LOCK.lock().unwrap();