feat: Implement backup deletion and improve exclusion list

This commit introduces two main improvements:

1.  **Backup Deletion:** The user can now delete system and user backups from the "Backup Content" view.
2.  **Improved Exclusion List:** The `.cache` directory is now excluded from backups by default, which should prevent "file has vanished" warnings from rsync.

pbp_app_config.py

@@ -86,6 +86,7 @@ class AppConfig:
 **/root/.gvfs
 /snap/*
 /home/*/.gvfs
+/home/*/.cache/*
 /var/cache/pacman/pkg/*
 /var/cache/apt/archives/*
 /var/cache/yum/*

pyimage_ui/system_backup_content_frame.py

@@ -122,9 +122,25 @@ class SystemBackupContentFrame(ttk.Frame):
         print(f"Restoring {backup_name}...")
 
     def _delete_selected(self):
-        # Placeholder for delete logic
         selected_item = self.content_tree.focus()
         if not selected_item:
             return
-        backup_name = self.content_tree.item(selected_item)["values"][0]
-        print(f"Deleting {backup_name}...")
+
+        item_values = self.content_tree.item(selected_item)["values"]
+        folder_name = item_values[4]  # Assuming folder_name is the 5th value
+
+        # Construct the full path to the backup folder
+        pybackup_path = os.path.join(self.backup_path, "pybackup")
+        folder_to_delete = os.path.join(pybackup_path, folder_name)
+
+        # Ask for confirmation
+        from shared_libs.message import MessageDialog
+        dialog = MessageDialog(master=self, message_type="warning",
+                               title=Msg.STR["confirm_delete_title"],
+                               text=Msg.STR["confirm_delete_text"].format(folder_name=folder_name),
+                               buttons=["ok_cancel"])
+        if dialog.get_result() != "ok":
+            return
+
+        self.backup_manager.delete_privileged_path(folder_to_delete)
+        self._load_backup_content()

pyimage_ui/user_backup_content_frame.py

@@ -109,9 +109,34 @@ class UserBackupContentFrame(ttk.Frame):
         print(f"Restoring {backup_name}...")
 
     def _delete_selected(self):
-        # Placeholder for delete logic
         selected_item = self.content_tree.focus()
         if not selected_item:
             return
-        backup_name = self.content_tree.item(selected_item)["values"][0]
-        print(f"Deleting {backup_name}...")
+
+        item_values = self.content_tree.item(selected_item)["values"]
+        folder_name = item_values[3]  # Assuming folder_name is the 4th value
+
+        # Construct the full path to the backup folder
+        folder_to_delete = os.path.join(self.backup_path, folder_name)
+        info_file_to_delete = os.path.join(self.backup_path, f"{folder_name}.txt")
+
+        # Ask for confirmation
+        from shared_libs.message import MessageDialog
+        dialog = MessageDialog(master=self, message_type="warning",
+                               title=Msg.STR["confirm_delete_title"],
+                               text=Msg.STR["confirm_delete_text"].format(folder_name=folder_name),
+                               buttons=["ok_cancel"])
+        if dialog.get_result() != "ok":
+            return
+
+        try:
+            import shutil
+            if os.path.isdir(folder_to_delete):
+                shutil.rmtree(folder_to_delete)
+            if os.path.exists(info_file_to_delete):
+                os.remove(info_file_to_delete)
+        except Exception as e:
+            MessageDialog(master=self, message_type="error",
+                          title=Msg.STR["error"], text=str(e))
+
+        self._load_backup_content()