Fix runway chart collapse and ops cleanup

tests/test_online_tracker.py

@@ -0,0 +1,27 @@
+import importlib
+import sys
+import threading
+
+
+def test_online_tracker_cleanup_timer_is_daemon(monkeypatch):
+    timers = []
+
+    class FakeTimer:
+        def __init__(self, interval, callback):
+            self.interval = interval
+            self.callback = callback
+            self.daemon = False
+            self.started = False
+            timers.append(self)
+
+        def start(self):
+            self.started = True
+
+    monkeypatch.setattr(threading, "Timer", FakeTimer)
+    sys.modules.pop("src.utils.online_tracker", None)
+
+    importlib.import_module("src.utils.online_tracker")
+
+    assert timers
+    assert timers[0].daemon is True
+    assert timers[0].started is True