Add optional parent_seed to portable backup

src/password_manager/manager.py

@@ -1154,6 +1154,7 @@ class PasswordManager:
                 self.backup_manager,
                 mode,
                 dest,
+                parent_seed=self.parent_seed,
             )
             print(colored(f"Database exported to '{path}'.", "green"))
             return path
@@ -1165,7 +1166,12 @@ class PasswordManager:
     def handle_import_database(self, src: Path) -> None:
         """Import a portable database file, replacing the current index."""
         try:
-            import_backup(self.vault, self.backup_manager, src)
+            import_backup(
+                self.vault,
+                self.backup_manager,
+                src,
+                parent_seed=self.parent_seed,
+            )
             print(colored("Database imported successfully.", "green"))
         except Exception as e:
             logging.error(f"Failed to import database: {e}", exc_info=True)

src/password_manager/portable_backup.py

@@ -55,6 +55,7 @@ def export_backup(
     dest_path: Path | None = None,
     *,
     publish: bool = False,
+    parent_seed: str | None = None,
 ) -> Path:
     """Export the current vault state to a portable encrypted file."""
 
@@ -65,7 +66,11 @@ def export_backup(
         dest_path = dest_dir / EXPORT_NAME_TEMPLATE.format(ts=ts)
 
     index_data = vault.load_index()
-    seed = vault.encryption_manager.decrypt_parent_seed()
+    seed = (
+        parent_seed
+        if parent_seed is not None
+        else vault.encryption_manager.decrypt_parent_seed()
+    )
     password = None
     if mode in (PortableMode.SEED_PLUS_PW, PortableMode.PW_ONLY):
         password = prompt_existing_password("Enter your master password: ")
@@ -109,6 +114,7 @@ def import_backup(
     vault: Vault,
     backup_manager: BackupManager,
     path: Path,
+    parent_seed: str | None = None,
 ) -> None:
     """Import a portable backup file and replace the current index."""
 
@@ -123,7 +129,11 @@ def import_backup(
     mode = PortableMode(wrapper.get("encryption_mode", PortableMode.SEED_ONLY.value))
     payload = base64.b64decode(wrapper["payload"])
 
-    seed = vault.encryption_manager.decrypt_parent_seed()
+    seed = (
+        parent_seed
+        if parent_seed is not None
+        else vault.encryption_manager.decrypt_parent_seed()
+    )
     password = None
     if mode in (PortableMode.SEED_PLUS_PW, PortableMode.PW_ONLY):
         password = prompt_existing_password("Enter your master password: ")