Add encryption mode change feature

src/tests/test_encryption_mode_change.py

@@ -0,0 +1,56 @@
+import sys
+from pathlib import Path
+from tempfile import TemporaryDirectory
+from types import SimpleNamespace
+from unittest.mock import patch
+
+from helpers import create_vault, TEST_SEED, TEST_PASSWORD
+
+sys.path.append(str(Path(__file__).resolve().parents[1]))
+
+from password_manager.entry_management import EntryManager
+from password_manager.config_manager import ConfigManager
+from password_manager.vault import Vault
+from password_manager.manager import PasswordManager
+from utils.key_derivation import EncryptionMode
+
+
+def test_change_encryption_mode(monkeypatch):
+    with TemporaryDirectory() as tmpdir:
+        fp = Path(tmpdir)
+        vault, enc_mgr = create_vault(
+            fp, TEST_SEED, TEST_PASSWORD, EncryptionMode.SEED_ONLY
+        )
+        entry_mgr = EntryManager(vault, fp)
+        cfg_mgr = ConfigManager(vault, fp)
+        vault.save_index({"passwords": {}})
+
+        pm = PasswordManager.__new__(PasswordManager)
+        pm.encryption_manager = enc_mgr
+        pm.entry_manager = entry_mgr
+        pm.config_manager = cfg_mgr
+        pm.vault = vault
+        pm.password_generator = SimpleNamespace(encryption_manager=enc_mgr)
+        pm.fingerprint_dir = fp
+        pm.current_fingerprint = "fp"
+        pm.parent_seed = TEST_SEED
+        pm.encryption_mode = EncryptionMode.SEED_ONLY
+
+        monkeypatch.setattr(
+            "password_manager.manager.prompt_existing_password",
+            lambda *_: TEST_PASSWORD,
+        )
+        pm.verify_password = lambda pw: True
+
+        with patch("password_manager.manager.NostrClient") as MockClient:
+            mock = MockClient.return_value
+            pm.nostr_client = mock
+            pm.change_encryption_mode(EncryptionMode.SEED_PLUS_PW)
+            mock.publish_json_to_nostr.assert_called_once()
+
+        assert pm.encryption_mode is EncryptionMode.SEED_PLUS_PW
+        assert pm.password_generator.encryption_manager is pm.encryption_manager
+        loaded = vault.load_index()
+        assert loaded["passwords"] == {}
+        cfg = cfg_mgr.load_config(require_pin=False)
+        assert cfg["encryption_mode"] == EncryptionMode.SEED_PLUS_PW.value