style(registry): format mk / yt / hw family HTML with oxfmt

The contributed HTML predates any oxfmt pass, so format:check failed for
42 files in both the Format and Preflight jobs. All 29 items re-rendered
after formatting and verified against frames — no visual change.

registry/blocks/mk-placeholder-grid/mk-placeholder-grid.html

@@ -89,7 +89,7 @@
         data-start="0"
         data-duration="8"
         data-track-index="0"
-        style="position:absolute;width:1px;height:1px;opacity:0;pointer-events:none"
+        style="position: absolute; width: 1px; height: 1px; opacity: 0; pointer-events: none"
       ></div>
     </div>
     <script>
@@ -215,7 +215,7 @@
               medias[i],
               { scale: base * 1.06 },
               { scale: base, duration: DUR - t0 - 0.6, ease: "sine.out" },
-              t0
+              t0,
             );
           }
         });