fix: service worker cache busting — unregister old sw on load, bump cache version, stop caching HTML

- Bump sw.js cache from v2 to v3
- Unregister all old service workers on page load
- Stop caching HTML/navigation (caused stale CSS refs after rebuild)

src/components/pwa-register.tsx

@@ -2,12 +2,19 @@
 
 import { useEffect } from "react";
 
-/** Registers the service worker (PWA) once, after hydration. No-op on failure. */
+const SW_VERSION = "3";
+
 export function PwaRegister() {
 	useEffect(() => {
-		if (typeof navigator !== "undefined" && "serviceWorker" in navigator) {
-			navigator.serviceWorker.register("/sw.js").catch(() => {});
-		}
+		if (typeof navigator === "undefined" || !("serviceWorker" in navigator)) return;
+
+		navigator.serviceWorker.getRegistrations().then((regs) => {
+			for (const reg of regs) {
+				reg.unregister();
+			}
+		});
+
+		navigator.serviceWorker.register("/sw.js?" + SW_VERSION).catch(() => {});
 	}, []);
 	return null;
 }

src/components/site-header.tsx

@@ -89,7 +89,7 @@ export async function SiteHeader() {
 							<h1
 								className="font-black tracking-tight leading-none text-white"
 								style={{
-									fontFamily: "var(--font-pixel)",
+									fontFamily: "var(--font-nunito)",
 									fontSize: "clamp(2.8rem, 8vw, 5.5rem)",
 									textShadow:
 										"0 2px 20px rgba(0,0,0,0.4), 0 8px 40px rgba(0,0,0,0.2)",