Version-stamped static URLs cached forever, thumbnail cache 25000 with throttled trimming

frontend/sw.js

@@ -46,7 +46,7 @@ const THUMB_HOSTS = new Set([
 ]);
 
 // Thumbnails accumulate with every card ever scrolled past — keep it bounded.
-const THUMB_CACHE_MAX = 2500;
+const THUMB_CACHE_MAX = 25000;
 function isVersionedShellCache(key) {
   return key.startsWith(SHELL_CACHE_PREFIX) && !UTILITY_CACHES.has(key);
 }
@@ -222,7 +222,10 @@ self.addEventListener('message', (e) => {
 // Cache-first: serve from cache; if missing, fetch, cache, return.
 async function cacheFirst(request) {
   const cache  = await caches.open(CACHE);
-  const cached = await cache.match(request);
+  // Shell files are precached under their plain URL; index.html asks for them as
+  // `file?v=<build>` (so the HTTP cache can keep them forever) — match ignoring it.
+  const versioned = /[?&]v=/.test(request.url);
+  const cached = await cache.match(request, versioned ? { ignoreSearch: true } : undefined);
   if (cached) return cached;
   try {
     const response = await fetch(request);
@@ -262,7 +265,7 @@ async function thumbnail(request) {
     const cors = await fetch(request.url, { mode: 'cors', credentials: 'omit' });
     if (cors && cors.ok) {
       await cache.put(request, cors.clone()).catch(() => {});
-      trimThumbCache();
+      if (++_thumbPuts % 100 === 0) trimThumbCache();
       return cors;
     }
   } catch { /* CORS refused or offline — fall through to the raw request */ }
@@ -271,7 +274,8 @@ async function thumbnail(request) {
     const raw = await fetch(request);
     if (raw && (raw.status === 200 || raw.status === 0)) {
       await cache.put(request, raw.clone()).catch(() => {});
-      trimThumbCache();
+      // keys() on a 25k-entry cache is not free — trim every 100th put, not each one.
+      if (++_thumbPuts % 100 === 0) trimThumbCache();
     }
     return raw;
   } catch {
@@ -282,6 +286,7 @@ async function thumbnail(request) {
 
 // Cache.keys() is insertion-ordered, so the front of the list is the oldest.
 let _trimmingThumbs = false;
+let _thumbPuts = 0;
 async function trimThumbCache() {
   if (_trimmingThumbs) return;
   _trimmingThumbs = true;