fix: improve image source handling in FlyerDisplay and adjust worker concurrency fallback

src/features/flyer/FlyerDisplay.tsx

@@ -28,6 +28,11 @@ interface FlyerDisplayProps {
 export const FlyerDisplay: React.FC<FlyerDisplayProps> = ({ imageUrl, store, validFrom, validTo, storeAddress, onOpenCorrectionTool }) => {
   const dateRange = formatDateRange(validFrom, validTo);
   
+  // Determine the correct image source. If imageUrl is already a full URL (starts with http)
+  // or is an absolute path (starts with /), use it directly. Otherwise, assume it's a relative
+  // filename from the database and prepend the correct path.
+  const imageSrc = imageUrl && (imageUrl.startsWith('http') || imageUrl.startsWith('/')) ? imageUrl : `/flyer-images/${imageUrl}`;
+  
   return (
     <div className="w-full rounded-lg overflow-hidden border border-gray-200 dark:border-gray-700 shadow-sm bg-white dark:bg-gray-900 flex flex-col">
       {(store || dateRange) && (
@@ -56,7 +61,7 @@ export const FlyerDisplay: React.FC<FlyerDisplayProps> = ({ imageUrl, store, val
       )}
       <div className="bg-gray-100 dark:bg-gray-800">
         {imageUrl ? (
-          <img src={`/flyer-images/${imageUrl}`} alt="Grocery Flyer" className="w-full h-auto object-contain max-h-[60vh] dark:invert dark:hue-rotate-180" />
+          <img src={imageSrc} alt="Grocery Flyer" className="w-full h-auto object-contain max-h-[60vh] dark:invert dark:hue-rotate-180" />
         ) : (
           <div className="w-full h-64 bg-gray-200 dark:bg-gray-700 rounded-lg flex items-center justify-center">
              <p className="text-gray-500">Flyer image will be displayed here</p>

src/services/queueService.server.ts

@@ -224,7 +224,7 @@ export const flyerWorker = new Worker<FlyerJobData>(
     // Control the number of concurrent jobs. This directly limits parallel calls to the AI API.
     // It's sourced from an environment variable for easy configuration without code changes.
     // The Google AI free tier limit is 60 RPM, so a low concurrency is safe.
-    concurrency: parseInt(process.env.WORKER_CONCURRENCY!, 10),
+    concurrency: parseInt(process.env.WORKER_CONCURRENCY || '1', 10),
   }
 );