fix: improve image proxy compatibility with CORS headers and Content-Type fallbacks to resolve broken lightbox images

app/api/image/[id]/route.ts

@@ -67,10 +67,13 @@ export async function GET(request: NextRequest, { params }: { params: Promise<{
   console.log(`[Image API] ✅ Serving ${assetId} (${size}) - Type: ${result.contentType}`);
 
   const headers: Record<string, string> = {
-    'Content-Type': result.contentType,
+    'Content-Type': result.contentType.includes('application/octet-stream')
+      ? 'image/jpeg'
+      : result.contentType,
     // Images are immutable once uploaded to Immich — cache aggressively
     'Cache-Control': 'public, max-age=31536000, immutable',
     'X-RateLimit-Remaining': String(remaining),
+    'Access-Control-Allow-Origin': '*', // Allow cross-origin for lightbox
   };
 
   if (result.contentLength) {