update cache

src/components/background/PatternBackgroundProvider.tsx

@@ -158,19 +158,19 @@ export function PatternBackgroundProvider({ children }: { children: ReactNode })
       cached.patternDataUrl;
 
     if (cacheHit) {
+      // Serve cached pattern immediately, then revalidate in background.
       setPatternImageUrl(cached.patternDataUrl!);
       setThemeCache(restaurantSlug, {
         ...themeBase,
         patternDataUrl: cached.patternDataUrl,
       });
       applyCachedThemeToDom(cached);
-      return;
     }
 
     let cancelled = false;
     const proxyUrl = `/${restaurantSlug}/api/proxy-svg?url=${encodeURIComponent(themeBase.bgUrl)}`;
 
-    fetch(proxyUrl)
+    fetch(proxyUrl, { cache: "no-store" })
       .then((response) => {
         if (!response.ok) {
           throw new Error("Failed to fetch background pattern");
@@ -181,7 +181,9 @@ export function PatternBackgroundProvider({ children }: { children: ReactNode })
         if (cancelled) return;
 
         const dataUrl = svgToDataUrl(colorizeSvg(svg, menuColor));
-        setPatternImageUrl(dataUrl);
+        if (dataUrl !== cached?.patternDataUrl) {
+          setPatternImageUrl(dataUrl);
+        }
 
         const nextCache = {
           ...themeBase,