Revert "fix: UART window stability on Windows — lift/focus, remove stray grab_release"

This reverts commit 4ef1ce0c6b.

src/gui/widgets.py

@@ -973,8 +973,6 @@ class UartMonitorWindow(ctk.CTkToplevel):
         self.geometry("680x540")
         self.minsize(480, 360)
         self.protocol("WM_DELETE_WINDOW", self._on_close)
-        self.lift()   # ensure visible on Windows
-        self.focus()
 
         self._on_log = on_log
 
@@ -1223,4 +1221,5 @@ class UartMonitorWindow(ctk.CTkToplevel):
         if self._monitor:
             self._monitor.stop()
             self._monitor = None
+        self.grab_release()
         self.destroy()