refactor: make library rendering server-first and deterministic

Move library header/covers to deterministic server-side rendering, split preference controls into controlled/uncontrolled modes, and remove client cover wrapper to eliminate hydration mismatches and provider coupling on library pages.

src/contexts/ServiceWorkerContext.tsx

@@ -172,6 +172,18 @@ export function ServiceWorkerProvider({ children }: { children: ReactNode }) {
       return;
     }
 
+    if (process.env.NODE_ENV === "development") {
+      setIsSupported(false);
+      setIsReady(false);
+      setVersion(null);
+
+      unregisterServiceWorker().catch(() => {
+        // Ignore cleanup failures in development
+      });
+
+      return;
+    }
+
     setIsSupported(true);
 
     // Register service worker