feat(window_manager): use OpenInputDesktop in find_window_by_match and exclude Catser overlay

Ensures desktop window enumeration accesses the user's interactive desktop station
across multiple monitors and ignores Catser's own overlay window.

catser/window_manager.py

@@ -174,7 +174,9 @@ class WindowManager:
         process_predicate: Optional[Callable[[str], bool]] = None,
     ) -> Optional[WindowInfo]:
         """
-        Enumerates top-level desktop windows to find the first matching window.
+        Enumerates top-level desktop windows to find the first matching visible window.
+        Uses the user's interactive input desktop to ensure windows across all monitors
+        are discovered even if the calling thread has a different default desktop.
         """
         found_hwnd = None
 
@@ -189,6 +191,10 @@ class WindowManager:
             if not title:
                 return True
 
+            # Never target Catser's own overlay window
+            if "catser overlay" in title.lower():
+                return True
+
             if title_predicate and title_predicate(title):
                 found_hwnd = hwnd
                 return False  # Stop enumeration
@@ -201,6 +207,11 @@ class WindowManager:
 
             return True
 
+        h_input_desk = user32.OpenInputDesktop(0, False, 0x01FF)
+        if h_input_desk:
+            user32.EnumDesktopWindows(h_input_desk, WNDENUMPROC(enum_proc), 0)
+            user32.CloseDesktop(h_input_desk)
+        else:
             user32.EnumWindows(WNDENUMPROC(enum_proc), 0)
 
         if found_hwnd: