Address update release review feedback

.github/workflows/release.yml

@@ -615,6 +615,11 @@ jobs:
 
           mkdir -p release-assets/upload
 
+          if [ "$IS_PRERELEASE" = "true" ] && [ "$RELEASE_SCOPE" != "all" ]; then
+            echo "Prerelease beta updates must include all platforms so every opted-in client can resolve beta metadata."
+            exit 1
+          fi
+
           required_metadata=(
             release-assets/windows-x64/latest.yml
             release-assets/linux-x64/latest-linux.yml

electron/windows.ts

@@ -223,7 +223,7 @@ function getUpdateToastBounds() {
 	const { workArea } = primaryDisplay;
 	return {
 		x: Math.round(workArea.x + (workArea.width - UPDATE_TOAST_WIDTH) / 2),
-		y: workArea.y + HUD_EDGE_MARGIN_DIP,
+		y: Math.round(workArea.y + workArea.height - UPDATE_TOAST_HEIGHT - HUD_EDGE_MARGIN_DIP),
 		width: UPDATE_TOAST_WIDTH,
 		height: UPDATE_TOAST_HEIGHT,
 	};