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_chat_actions.py

@@ -0,0 +1,65 @@
+import unittest
+import importlib.util
+from types import SimpleNamespace
+from pathlib import Path
+
+_SPEC = importlib.util.spec_from_file_location(
+    "chat_actions",
+    Path("services/chat_actions.py"),
+)
+_MODULE = importlib.util.module_from_spec(_SPEC)
+_SPEC.loader.exec_module(_MODULE)
+load_chat_conversations = _MODULE.load_chat_conversations
+resolve_user_ids = _MODULE.resolve_user_ids
+
+
+class ChatActionsTests(unittest.TestCase):
+    def test_resolve_user_ids_mixed_results(self):
+        mapping = {
+            "id1": {"type": "user", "object_id": 1},
+            "id2": {"type": "group", "object_id": 2},
+        }
+
+        def call_with_retry(func, **kwargs):
+            return func(**kwargs)
+
+        def resolve_screen_name(screen_name):
+            if screen_name == "boom":
+                raise RuntimeError("boom")
+            return mapping.get(screen_name)
+
+        vk_api = SimpleNamespace(utils=SimpleNamespace(resolveScreenName=resolve_screen_name))
+        links = [
+            "https://vk.com/id1",
+            "https://vk.com/id2",
+            "https://vk.com/boom",
+            "https://vk.com/",
+        ]
+        resolved, failed = resolve_user_ids(call_with_retry, vk_api, links)
+
+        self.assertEqual(resolved, [1])
+        self.assertEqual(len(failed), 3)
+        self.assertEqual(failed[0][0], "https://vk.com/id2")
+        self.assertIsNone(failed[0][1])
+
+    def test_load_chat_conversations_paginated(self):
+        pages = [
+            {"items": [{"id": 1}], "next_from": "page-2"},
+            {"items": [{"id": 2}]},
+        ]
+
+        def get_conversations(**kwargs):
+            if kwargs.get("start_from") == "page-2":
+                return pages[1]
+            return pages[0]
+
+        def call_with_retry(func, **kwargs):
+            return func(**kwargs)
+
+        vk_api = SimpleNamespace(messages=SimpleNamespace(getConversations=get_conversations))
+        items = load_chat_conversations(call_with_retry, vk_api)
+        self.assertEqual(items, [{"id": 1}, {"id": 2}])
+
+
+if __name__ == "__main__":
+    unittest.main()