fix(tui): clear sidebar hover highlight on exit while loading

crates/tui/src/tui/mouse_ui.rs

@@ -35,7 +35,10 @@ pub(crate) fn should_drop_loading_mouse_motion(app: &App, mouse: MouseEvent) ->
     match mouse.kind {
         MouseEventKind::Moved => {
             let over_sidebar = mouse_hits_rect(mouse, app.viewport.last_sidebar_area);
-            !(over_sidebar || app.sidebar_hover_tooltip.is_some())
+            let was_over_sidebar = app.last_mouse_pos.is_some_and(|(column, row)| {
+                point_hits_rect(column, row, app.viewport.last_sidebar_area)
+            });
+            !(over_sidebar || was_over_sidebar || app.sidebar_hover_tooltip.is_some())
         }
         MouseEventKind::Drag(_) => {
             // Sidebar drag-to-resize must stay live during active turns —
@@ -668,14 +671,18 @@ pub(crate) fn tick_selection_autoscroll(app: &mut App) {
 }
 
 pub(crate) fn mouse_hits_rect(mouse: MouseEvent, area: Option<Rect>) -> bool {
+    point_hits_rect(mouse.column, mouse.row, area)
+}
+
+fn point_hits_rect(column: u16, row: u16, area: Option<Rect>) -> bool {
     let Some(area) = area else {
         return false;
     };
 
-    mouse.column >= area.x
-        && mouse.column < area.x.saturating_add(area.width)
-        && mouse.row >= area.y
-        && mouse.row < area.y.saturating_add(area.height)
+    column >= area.x
+        && column < area.x.saturating_add(area.width)
+        && row >= area.y
+        && row < area.y.saturating_add(area.height)
 }
 
 pub(crate) fn open_context_menu(app: &mut App, mouse: MouseEvent) {

crates/tui/src/tui/ui/tests.rs

@@ -830,6 +830,38 @@ fn loading_mouse_filter_allows_sidebar_hover_to_clear() {
     assert_eq!(app.last_mouse_pos, Some((12, 5)));
 }
 
+#[test]
+fn loading_mouse_filter_allows_sidebar_exit_to_clear_highlight() {
+    let mut app = create_test_app();
+    app.is_loading = true;
+    app.viewport.last_sidebar_area = Some(Rect::new(60, 4, 20, 6));
+    app.last_mouse_pos = Some((60, 5));
+
+    let exit_left = MouseEvent {
+        kind: MouseEventKind::Moved,
+        column: 59,
+        row: 5,
+        modifiers: KeyModifiers::NONE,
+    };
+
+    assert!(
+        !should_drop_loading_mouse_motion(&app, exit_left),
+        "first move out of the sidebar must clear stale sidebar hover state"
+    );
+    handle_mouse_event(&mut app, exit_left);
+
+    assert_eq!(app.last_mouse_pos, Some((59, 5)));
+    assert!(should_drop_loading_mouse_motion(
+        &app,
+        MouseEvent {
+            kind: MouseEventKind::Moved,
+            column: 58,
+            row: 5,
+            modifiers: KeyModifiers::NONE,
+        }
+    ));
+}
+
 #[test]
 fn jump_to_latest_button_click_scrolls_to_tail() {
     let mut app = create_test_app();