feat: add cold display alarm flow and labeled snapshots

tests/test_config.py

@@ -16,7 +16,9 @@ class ConfigTests(unittest.TestCase):
 camera_id = "cam_a"
 
 [thresholds]
+pre_warning_seconds = 20
 max_dwell_seconds = 30
+alarm_removal_seconds = 2
 trash_confirmation_seconds = 4
 
 [layout]
@@ -29,7 +31,9 @@ cols = 2
             settings = load_settings(path)
 
         self.assertEqual(settings.camera_id, "cam_a")
+        self.assertEqual(settings.pre_warning_seconds, 20)
         self.assertEqual(settings.max_dwell_seconds, 30)
+        self.assertEqual(settings.alarm_removal_seconds, 2)
         self.assertEqual(settings.trash_confirmation_seconds, 4)
         self.assertEqual(settings.zone_ids, ("r1c1", "r1c2"))
 
@@ -118,6 +122,8 @@ zone_ids = ["1", "2", "3"]
             text = path.read_text(encoding="utf-8")
 
         self.assertIn("zone_count = 2", text)
+        self.assertIn("pre_warning_seconds = 0", text)
+        self.assertIn("alarm_removal_seconds = 0", text)
         self.assertIn('label = "区域 1"', text)
         self.assertIn("[trash]", text)
         self.assertNotIn('"trash"', text.split("[layout]", maxsplit=1)[1].split("[[zones]]", maxsplit=1)[0])