Fix Windows overlay scaling bounds (#34)

src/core/services/overlay-window-bounds.ts

@@ -0,0 +1,25 @@
+import type { WindowGeometry } from '../../types';
+
+type ScreenDipConverter = {
+  screenToDipRect: (
+    window: Electron.BrowserWindow | null,
+    rect: Electron.Rectangle,
+  ) => Electron.Rectangle;
+};
+
+export function normalizeOverlayWindowBoundsForPlatform(
+  geometry: WindowGeometry,
+  platform: NodeJS.Platform,
+  screen: ScreenDipConverter | null,
+): WindowGeometry {
+  if (platform !== 'win32' || !screen) {
+    return geometry;
+  }
+
+  return screen.screenToDipRect(null, {
+    x: geometry.x,
+    y: geometry.y,
+    width: geometry.width,
+    height: geometry.height,
+  });
+}