refactor: вынес сервисы и ui-компоненты

- вынес token/chat/update логику в services

- вынес диалог и текст инструкции в ui

- добавил и обновил тесты для нового слоя

tests/test_token_store.py

@@ -0,0 +1,53 @@
+import tempfile
+import unittest
+import importlib.util
+from pathlib import Path
+from unittest.mock import patch
+
+_SPEC = importlib.util.spec_from_file_location(
+    "token_store",
+    Path("services/token_store.py"),
+)
+_MODULE = importlib.util.module_from_spec(_SPEC)
+_SPEC.loader.exec_module(_MODULE)
+load_token = _MODULE.load_token
+save_token = _MODULE.save_token
+
+
+class TokenStoreTests(unittest.TestCase):
+    def test_save_and_load_non_expiring_token(self):
+        with tempfile.TemporaryDirectory() as td:
+            token_file = Path(td) / "token.json"
+            with patch.object(_MODULE.os, "name", "posix"):
+                expiration = save_token(
+                    token="abc123",
+                    token_file=str(token_file),
+                    app_data_dir=td,
+                    expires_in=0,
+                )
+                token, loaded_expiration = load_token(str(token_file))
+
+        self.assertEqual(expiration, 0)
+        self.assertEqual(token, "abc123")
+        self.assertEqual(loaded_expiration, 0)
+
+    def test_expired_token_is_removed(self):
+        with tempfile.TemporaryDirectory() as td:
+            token_file = Path(td) / "token.json"
+            with patch.object(_MODULE.os, "name", "posix"):
+                with patch.object(_MODULE.time, "time", return_value=1000):
+                    save_token(
+                    token="abc123",
+                    token_file=str(token_file),
+                    app_data_dir=td,
+                    expires_in=1,
+                    )
+                with patch.object(_MODULE.time, "time", return_value=2000):
+                    token, expiration = load_token(str(token_file))
+
+        self.assertIsNone(token)
+        self.assertIsNone(expiration)
+
+
+if __name__ == "__main__":
+    unittest.main()