feat: wire up BLBLogo and FBBanner as site icon and OG image

- favicon.ico, icon-192/512, apple-touch-icon → BLBLogo.png
- og:image + twitter:card image → FBBanner.png (OG image)
- Display BLBLogo in About section (replaces skull placeholder)
- Add Next/Image import and aboutLogo CSS class

styles/Home.module.css

@@ -253,6 +253,13 @@
   opacity: 0.15;
 }
 
+.aboutLogo {
+  width: 100%;
+  height: 100%;
+  object-fit: cover;
+  display: block;
+}
+
 .aboutVisual::before {
   content: '';
   position: absolute;