Align empty branch list message with search (#31465)

## Summary

Selection rows reserve their first two columns for the selection cursor
and render into the menu surface's left gutter. The empty-state message
reused that shifted row area even though it has no cursor prefix, so `no
matches` appeared two columns to the left of the search field.

This renders empty lists at the inset list origin while preserving the
cursor gutter for non-empty rows.

codex-rs/tui/src/bottom_pane/list_selection_view.rs

@@ -1269,7 +1269,11 @@ impl Renderable for ListSelectionView {
         // -- List rows --
         if list_area.height > 0 {
             let render_area = Rect {
-                x: list_area.x.saturating_sub(2),
+                x: if rows.is_empty() {
+                    list_area.x
+                } else {
+                    list_area.x.saturating_sub(2)
+                },
                 y: list_area.y,
                 width: effective_rows_width.max(1),
                 height: list_area.height,
@@ -1715,6 +1719,29 @@ mod tests {
         );
     }
 
+    #[test]
+    fn empty_searchable_list_aligns_message_with_search() {
+        let (tx_raw, _rx) = unbounded_channel::<AppEvent>();
+        let tx = AppEventSender::new(tx_raw);
+        let view = new_view(
+            SelectionViewParams {
+                title: Some("Select a base branch".to_string()),
+                footer_hint: Some(standard_popup_hint_line()),
+                is_searchable: true,
+                search_placeholder: Some("Type to search branches".to_string()),
+                ..Default::default()
+            },
+            tx,
+        );
+
+        let rendered = render_lines_with_width(&view, /*width*/ 48)
+            .lines()
+            .map(str::trim_end)
+            .collect::<Vec<_>>()
+            .join("\n");
+        assert_snapshot!("list_selection_empty_searchable", rendered);
+    }
+
     #[test]
     fn paste_appends_to_search_query_and_filters_items() {
         let (tx_raw, _rx) = unbounded_channel::<AppEvent>();

codex-rs/tui/src/bottom_pane/snapshots/codex_tui__bottom_pane__list_selection_view__tests__list_selection_empty_searchable.snap

@@ -0,0 +1,11 @@
+---
+source: tui/src/bottom_pane/list_selection_view.rs
+expression: rendered
+---
+
+  Select a base branch
+
+  Type to search branches
+  no matches
+
+  Press enter to confirm or esc to go back