feat(ui): Improve "Backup Content" view default behavior

Implements a more intuitive default view for the "Backup Content" screen based on user context.

- After a backup is completed, the "Backup Content" view will now automatically open the tab corresponding to the type of backup just performed (System or User).
- On a fresh application start, the "Backup Content" view will now always default to showing the "System" backups tab.
- This is achieved by adding state variables to the main app and modifying the navigation logic, while removing the previous behavior of saving the last-viewed tab to the config.

main_app.py

@@ -91,6 +91,8 @@ class MainApplication(tk.Tk):
         self.mode = "backup"  # Default mode
         self.backup_is_running = False
         self.start_time = None
+        self.last_backup_was_system = True
+        self.next_backup_content_view = 'system'
 
         self.calculation_thread = None
         self.calculation_stop_event = None
@@ -688,6 +690,12 @@ class MainApplication(tk.Tk):
                         elif status_info is None:
                             status = 'success'
 
+                        if status in ['success', 'warning']:
+                            if self.last_backup_was_system:
+                                self.next_backup_content_view = 'system'
+                            else:
+                                self.next_backup_content_view = 'user'
+
                         if status == 'success':
                             self.info_label.config(
                                 text=Msg.STR["backup_finished_successfully"])

pyimage_ui/actions.py

@@ -623,9 +623,11 @@ class Actions:
                     return
 
                 if source_folder == "Computer":
+                    self.app.last_backup_was_system = True
                     mode = "full" if self.app.vollbackup_var.get() else "incremental"
                     self._start_system_backup(mode, source_size_bytes)
                 else:
+                    self.app.last_backup_was_system = False
                     self._start_user_backup()
             else:  # restore mode
                 # Restore logic would go here

pyimage_ui/backup_content_frame.py

@@ -119,8 +119,6 @@ class BackupContentFrame(ttk.Frame):
 
     def _switch_view(self, index):
         self.current_view_index = index
-        config_key = "last_encrypted_backup_content_view" if self.viewing_encrypted else "last_backup_content_view"
-        self.app.config_manager.set_setting(config_key, index)
         self.update_nav_buttons(index)
 
         if index == 0:

pyimage_ui/navigation.py

@@ -269,7 +269,7 @@ class Navigation:
         self.app.top_bar.grid()
         self._update_task_bar_visibility("settings")
 
-    def toggle_backup_content_frame(self, initial_tab_index=0):
+    def toggle_backup_content_frame(self, _=None): # Accept argument but ignore it
         self._cancel_calculation()
         self.app.drawing.update_nav_buttons(2)  # Index 2 for Backup Content
 
@@ -291,12 +291,16 @@ class Navigation:
         self.app.restore_size_frame_before.grid_remove()
         self.app.restore_size_frame_after.grid_remove()
 
-        is_encrypted = self.app.backup_manager.encryption_manager.is_encrypted(
-            self.app.destination_path)
-        config_key = "last_encrypted_backup_content_view" if is_encrypted else "last_backup_content_view"
-        last_view_index = self.app.config_manager.get_setting(config_key, 0)
+        if self.app.next_backup_content_view == 'user':
+            initial_tab_index = 1
+        else:  # Default to system
+            initial_tab_index = 0
+
         self.app.backup_content_frame.show(
-            self.app.destination_path, last_view_index)
+            self.app.destination_path, initial_tab_index)
+
+        # Reset to default for next time
+        self.app.next_backup_content_view = 'system'
 
         self.app.top_bar.grid()
         self._update_task_bar_visibility("scheduler")