fix: move watchdog Observer import to module level (#1200)

src/copilot_usage/interactive.py

@@ -14,6 +14,7 @@
 from rich.console import Console
 from rich.table import Table
 from rich.text import Text
+from watchdog.observers import Observer
 
 from copilot_usage import __version__
 from copilot_usage.models import SessionSummary
@@ -132,8 +133,6 @@ def start_observer(
     treat a ``None`` return as "auto-refresh unavailable" and continue
     without it.
     """
-    from watchdog.observers import Observer
-
     handler: FileChangeEventHandler = FileChangeHandler(change_event)
     observer = Observer()
     observer.schedule(handler, str(session_path), recursive=True)  # pyright: ignore[reportArgumentType]

tests/copilot_usage/test_interactive.py

@@ -0,0 +1,12 @@
+"""Tests for copilot_usage.interactive module."""
+
+import copilot_usage.interactive as _interactive_mod
+from watchdog.observers import Observer
+
+
+def test_watchdog_observer_imported_at_module_level() -> None:
+    """Observer must be importable as a module-level attribute, not deferred."""
+    assert hasattr(_interactive_mod, "Observer"), (
+        "Observer should be imported at module level in interactive.py"
+    )
+    assert _interactive_mod.Observer is Observer