Add offline mode feature

src/tests/test_cli_toggle_offline_mode.py

@@ -0,0 +1,40 @@
+from types import SimpleNamespace
+from typer.testing import CliRunner
+
+from seedpass.cli import app
+from seedpass import cli
+
+runner = CliRunner()
+
+
+def _make_pm(called, enabled=False):
+    cfg = SimpleNamespace(
+        get_offline_mode=lambda: enabled,
+        set_offline_mode=lambda v: called.setdefault("enabled", v),
+    )
+    pm = SimpleNamespace(
+        config_manager=cfg,
+        offline_mode=enabled,
+        select_fingerprint=lambda fp: None,
+    )
+    return pm
+
+
+def test_toggle_offline_updates(monkeypatch):
+    called = {}
+    pm = _make_pm(called)
+    monkeypatch.setattr(cli, "PasswordManager", lambda: pm)
+    result = runner.invoke(app, ["config", "toggle-offline"], input="y\n")
+    assert result.exit_code == 0
+    assert called == {"enabled": True}
+    assert "Offline mode enabled." in result.stdout
+
+
+def test_toggle_offline_keep(monkeypatch):
+    called = {}
+    pm = _make_pm(called, enabled=True)
+    monkeypatch.setattr(cli, "PasswordManager", lambda: pm)
+    result = runner.invoke(app, ["config", "toggle-offline"], input="\n")
+    assert result.exit_code == 0
+    assert called == {"enabled": True}
+    assert "Offline mode enabled." in result.stdout