fix: improve cache-control headers and add purge logging

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: aster-void

src/hooks.server.ts

@@ -81,10 +81,14 @@ const handleCache: Handle = async ({ event, resolve }) => {
     return response;
   }
 
-  // Public pages: aggressive Cloudflare caching
-  // s-maxage=3600: CDN caches for 1 hour
-  // stale-while-revalidate=86400: serve stale for up to 1 day while revalidating
-  response.headers.set("Cache-Control", "public, s-maxage=3600, stale-while-revalidate=86400");
+  // Public pages: layered caching
+  // max-age=120: browser caches for 2 minutes (snappy navigation)
+  // s-maxage=3600: CDN caches for 1 hour (purged on mutations)
+  // stale-while-revalidate=60: serve stale for up to 1 minute while revalidating
+  response.headers.set(
+    "Cache-Control",
+    "public, max-age=120, s-maxage=3600, stale-while-revalidate=60",
+  );
   return response;
 };
 

src/lib/server/services/cloudflare/cache.server.ts

@@ -3,7 +3,12 @@ import { env } from "$lib/env/env.server";
 const CLOUDFLARE_API_BASE = "https://api.cloudflare.com/client/v4";
 
 export async function purgeCache(): Promise<void> {
-  if (!env.CLOUDFLARE_ZONE_ID || !env.CLOUDFLARE_API_TOKEN) return;
+  if (!env.CLOUDFLARE_ZONE_ID || !env.CLOUDFLARE_API_TOKEN) {
+    console.warn(
+      "[cache] Cloudflare cache purge skipped: CLOUDFLARE_ZONE_ID or CLOUDFLARE_API_TOKEN not set",
+    );
+    return;
+  }
 
   const res = await fetch(`${CLOUDFLARE_API_BASE}/zones/${env.CLOUDFLARE_ZONE_ID}/purge_cache`, {
     method: "POST",