Refactor imports across multiple files: remove unused imports to clean up code and improve readability.

tests/test_add_entry_modal.py

@@ -6,9 +6,8 @@ DNS name entries, validation, and mutual exclusion logic.
 """
 
 import pytest
-from unittest.mock import Mock, MagicMock
-from textual.widgets import Input, Checkbox, RadioSet, RadioButton, Static
-from textual.app import App
+from unittest.mock import Mock
+from textual.widgets import Input, Checkbox, RadioSet, Static
 
 from src.hosts.tui.add_entry_modal import AddEntryModal
 from src.hosts.core.models import HostEntry

tests/test_dns.py

@@ -7,7 +7,7 @@ and integration with hosts entries.
 
 import pytest
 import asyncio
-from unittest.mock import AsyncMock, MagicMock, patch
+from unittest.mock import AsyncMock, patch
 from datetime import datetime, timedelta
 import socket
 

tests/test_import_export.py

@@ -12,8 +12,7 @@ import tempfile
 from pathlib import Path
 from datetime import datetime
 from src.hosts.core.import_export import (
-    ImportExportService, ImportResult, ExportResult, 
-    ExportFormat, ImportFormat
+    ImportExportService, ImportResult, ExportFormat, ImportFormat
 )
 from src.hosts.core.models import HostEntry, HostsFile