fix: Prevent unstyled content during reload (#22)

Co-authored-by: me <me@kentcdodds.com>
Co-authored-by: Cursor Agent <cursoragent@cursor.com>

Author: kentcdodds

src/index.ts

@@ -83,7 +83,15 @@ function checkClientHints() {
 			cookieChanged = true;
 		}
 	}
-	if (cookieChanged) window.location.reload();
+	if (cookieChanged) {
+		// Hide the page content immediately to prevent visual flicker
+		const style = document.createElement('style');
+		style.textContent = 'html { visibility: hidden !important; }';
+		document.head.appendChild(style);
+
+		// Trigger the reload
+		window.location.reload();
+	}
 }
 
 checkClientHints();