🔧 chore(lighthouse): add responsive images assertion

Add a warning assertion for the 'uses-responsive-images' audit in
Lighthouse configuration with a threshold of 100KB max wasted bytes.
This helps identify oversized images that could be optimized.

Author: w3bdesign

lighthouserc.json

@@ -28,6 +28,7 @@
         "categories:accessibility": ["warn", { "minScore": 0.9 }],
         "categories:best-practices": ["warn", { "minScore": 0.9 }],
         "categories:seo": ["warn", { "minScore": 0.9 }],
+        "uses-responsive-images": ["warn", { "maxWastedBytes": 102400 }],
         "uses-http2": "off"
       }
     }