fix(blog): ensure target environment vars are parsed for accurate strict filtering in prod, and integrate face detection gravity for blog thumbnails

lib/env.ts

@@ -20,6 +20,8 @@ const booleanSchema = z.preprocess((val) => {
 const envExtension = {
   // Project specific overrides or additions
   AUTH_COOKIE_NAME: z.string().default('klz_gatekeeper_session'),
+  TARGET: z.string().optional(),
+  NEXT_PUBLIC_TARGET: z.string().optional(),
 
   // Gatekeeper specifics not in base
   GATEKEEPER_URL: z.string().url().default('http://gatekeeper:3000'),

lib/imgproxy-loader.ts

@@ -23,11 +23,28 @@ export default function imgproxyLoader({
     return src;
   }
 
+  // Check if src contains custom gravity query parameter
+  let gravity = 'sm'; // Use smart gravity (content-aware) by default
+  let cleanSrc = src;
+
+  try {
+    // Dummy base needed for relative URLs
+    const url = new URL(src, 'http://localhost');
+    const customGravity = url.searchParams.get('gravity');
+    if (customGravity) {
+      gravity = customGravity;
+      url.searchParams.delete('gravity');
+      cleanSrc = src.startsWith('http') ? url.href : url.pathname + url.search;
+    }
+  } catch (e) {
+    // Fallback if parsing fails
+  }
+
   // We use the width provided by Next.js for responsive images
   // Height is set to 0 to maintain aspect ratio
-  return getImgproxyUrl(src, {
+  return getImgproxyUrl(cleanSrc, {
     width,
     resizing_type: 'fit',
-    gravity: 'sm', // Use smart gravity (content-aware) instead of face detection (requires ML)
+    gravity,
   });
 }