feat: added swich for timers_screen; refactor: commented out the non-working code and stubs

kv/navigation_panel.kv

@@ -27,6 +27,7 @@
             id: timers_nav
             icon: "timer-outline"
             text: "Таймеры"
+            on_release: app.switch_screen(self)
 
         CommonNavigationRailItem:
             id: guide_nav

kv/timers_screen.kv

@@ -54,21 +54,21 @@
                 MDButtonText:
                     text: "Открыть"
 
-            MDButton:
-                timer_id: root.id
-                style: "outlined"
-                size_hint_x: 1
+            # MDButton:
+            #     timer_id: root.id
+            #     style: "outlined"
+            #     size_hint_x: 1
 
-                MDButtonText:
-                    text: "Редактировать"
+            #     MDButtonText:
+            #         text: "Редактировать"
 
-            MDButton:
-                timer_id: root.id
-                style: "outlined"
-                size_hint_x: 1
+            # MDButton:
+            #     timer_id: root.id
+            #     style: "outlined"
+            #     size_hint_x: 1
 
-                MDButtonText:
-                    text: "Удалить"
+            #     MDButtonText:
+            #         text: "Удалить"
 
 # Основной экран
 <TimersScreen>: