feat(website): replace hero screenshot with video

Add autoplaying video loop to the landing page for a more dynamic hero section.

src/pages/index.astro

@@ -45,7 +45,10 @@ const version = pkg.version ?? "";
       <!-- Screenshot Reveal -->
       <div class="container" style="margin-top: var(--space-2xl); position: relative; z-index: 2;">
         <div style="border: 1px solid var(--color-border); border-radius: var(--border-radius); overflow: hidden; box-shadow: 0 20px 50px rgba(0,0,0,0.5), 0 0 30px rgba(0,221,119,0.1); background: var(--color-bg-elevated); padding: 2px;">
-          <img src="/screenshot-01.png" alt="Zaguán Blade Editor Interface" style="width: 100%; height: auto; display: block; border: 1px solid var(--color-border);" />
+          <video autoplay loop muted playsinline style="width: 100%; height: auto; display: block;">
+            <source src="/zblade.mp4" type="video/mp4" />
+            Your browser does not support the video tag.
+          </video>
         </div>
       </div>
     </section>