feat: enhance duty information handling with contact details and current duty view

- Added `bot_username` to settings for dynamic retrieval of the bot's username.
- Implemented `_resolve_bot_username` function to fetch the bot's username if not set, improving user experience in group chats.
- Updated `DutyWithUser` schema to include optional `phone` and `username` fields for enhanced duty information.
- Enhanced API responses to include contact details for users, ensuring better communication.
- Introduced a new current duty view in the web app, displaying active duty information along with contact options.
- Updated CSS styles for better presentation of contact information in duty cards.
- Added unit tests to verify the inclusion of contact details in API responses and the functionality of the current duty view.

tests/test_api_dependencies.py

@@ -71,3 +71,31 @@ class TestValidateDutyDates:
         assert exc_info.value.status_code == 400
         assert exc_info.value.detail == "From after to message"
         mock_t.assert_called_with("ru", "dates.from_after_to")
+
+
+class TestFetchDutiesResponse:
+    """Tests for fetch_duties_response (DutyWithUser list with phone, username)."""
+
+    def test_fetch_duties_response_includes_phone_and_username(self):
+        """get_duties returns (Duty, full_name, phone, username); response has phone, username."""
+        from types import SimpleNamespace
+
+        from duty_teller.db.schemas import DutyWithUser
+
+        duty = SimpleNamespace(
+            id=1,
+            user_id=10,
+            start_at="2025-01-15T09:00:00Z",
+            end_at="2025-01-15T18:00:00Z",
+            event_type="duty",
+        )
+        rows = [(duty, "Alice", "+79001234567", "alice_dev")]
+        with patch.object(deps, "get_duties", return_value=rows):
+            result = deps.fetch_duties_response(
+                type("Session", (), {})(), "2025-01-01", "2025-01-31"
+            )
+        assert len(result) == 1
+        assert isinstance(result[0], DutyWithUser)
+        assert result[0].full_name == "Alice"
+        assert result[0].phone == "+79001234567"
+        assert result[0].username == "alice_dev"