fix: tune detection patterns and add state transition logging

- Added "Resume" and "Continue" to approval keywords
- Added state transition logging to daemon for observability
- Guarded signal handler against duplicate SIGTERM delivery
- Verified end-to-end: daemon detects approval prompt, transitions
  to waiting_for_user, overlays 1 window, plays sound

Made-with: Cursor

src/cursor_flasher/daemon.py

@@ -67,14 +67,20 @@ class FlasherDaemon:
             ):
                 elapsed = time.monotonic() - self._waiting_since
                 if elapsed > self.config.auto_dismiss:
+                    logger.info("Auto-dismissing after timeout")
                     self.state_machine.dismiss()
                     self.overlay.hide()
                     self._waiting_since = None
             return
 
+        logger.info("State → %s", self.state_machine.state.value)
+
         match self.state_machine.state:
             case FlasherState.WAITING_FOR_USER:
                 if result.active_windows:
+                    logger.info(
+                        "Showing overlay on %d window(s)", len(result.active_windows)
+                    )
                     self.overlay.show(result.active_windows)
                     play_alert(self.config)
                     self._waiting_since = time.monotonic()
@@ -83,7 +89,9 @@ class FlasherDaemon:
                 self._waiting_since = None
 
     def _handle_signal(self, signum, frame):
-        logger.info(f"Received signal {signum}, shutting down")
+        if not self._running:
+            return
+        logger.info("Received signal %d, shutting down", signum)
         self.stop()