refactor(ui): 清理 K26 旧 UI 与死代码

test/home/home_logic_test.dart

@@ -109,16 +109,15 @@ void main() {
     },
   );
 
-  test('should_return_home_and_open_drawer_when_system_back_is_pressed', () {
+  test('should_return_to_discover_and_handle_immersive_back', () {
     final logic = HomeLogic(dramas);
 
     // Home is the launch tab; the first back press lands on Discover.
     logic.onSystemBack();
     expect(logic.tab, 1);
     logic.onSystemBack();
-    expect(logic.drawerOpen, isTrue);
+    expect(logic.tab, 1);
     expect(logic.backRequest, 0);
-    logic.onDrawerChanged(false);
 
     logic.select(0);
     logic.onSystemBack();
@@ -131,30 +130,25 @@ void main() {
     expect(logic.backRequest, 1);
     expect(logic.tab, 0);
 
-    logic.onDrawerChanged(true);
-    logic.onSystemBack();
-    expect(logic.backRequest, 1);
-
-    logic.onDrawerChanged(false);
     logic.onImmersiveChanged(false);
     logic.onSystemBack();
     expect(logic.tab, 1);
     logic.dispose();
   });
 
-  test('should_notify_only_on_actual_change_when_drawer_state_is_set', () {
+  test('should_notify_only_on_actual_change_when_menu_state_is_set', () {
     final logic = HomeLogic(dramas);
     var notifications = 0;
     logic.addListener(() => notifications++);
 
-    logic.onDrawerChanged(false);
+    logic.setMenuOpen(false);
     expect(notifications, 0);
 
-    logic.onDrawerChanged(true);
+    logic.setMenuOpen(true);
     expect(logic.drawerOpen, isTrue);
     expect(notifications, 1);
 
-    logic.onDrawerChanged(true);
+    logic.setMenuOpen(true);
     expect(notifications, 1);
     logic.dispose();
   });