fix(home): hide the demo bundles' unpack placeholder (#46)

Opening the site flashed a blue bolt on a dark card inside the frame —
the bundler's own "unpacking" placeholder — before the walkthrough
appeared. Measured on a cold frame it was on screen from ~15ms until the
bundle swapped the document out.

Both bundles now hide #__bundler_thumbnail and the "Unpacking..." pill
from their own head style. The wrapper already paints the box, so the
frame simply stays empty for those few frames. Nothing in the unpacking
script touches either element, and the style disappears with the rest of
the placeholder document when it is replaced.

This edits vendored artifacts, so the rule carries a comment saying to
re-apply it if the bundles are regenerated.

Author: cevheri

public/demo/libredb-studio-demo-mobile.html

@@ -10,6 +10,13 @@
     #__bundler_thumbnail { position: fixed; inset: 0; width: 100%; height: 100%; display: flex; align-items: center; justify-content: center; background: #030303; z-index: 9999; }
     #__bundler_thumbnail svg { width: 100%; height: 100%; object-fit: contain; }
     #__bundler_placeholder { color: #999; font-size: 14px; }
+    /* libredb-website patch: the unpack placeholder — a blue bolt on a dark card,
+       plus an "Unpacking..." pill — flashed in the frame before the walkthrough
+       appeared. Our wrapper already paints the box, so hide both and let the
+       frame stay empty until the real document replaces this one. Nothing in
+       the unpacking script touches these two elements. Re-apply if these
+       bundles are regenerated. */
+    #__bundler_thumbnail, #__bundler_loading { display: none !important; }
   </style>
   <noscript>
     <style>#__bundler_loading { display: none; }</style>

public/demo/libredb-studio-demo.html

@@ -10,6 +10,13 @@
     #__bundler_thumbnail { position: fixed; inset: 0; width: 100%; height: 100%; display: flex; align-items: center; justify-content: center; background: #030303; z-index: 9999; }
     #__bundler_thumbnail svg { width: 100%; height: 100%; object-fit: contain; }
     #__bundler_placeholder { color: #999; font-size: 14px; }
+    /* libredb-website patch: the unpack placeholder — a blue bolt on a dark card,
+       plus an "Unpacking..." pill — flashed in the frame before the walkthrough
+       appeared. Our wrapper already paints the box, so hide both and let the
+       frame stay empty until the real document replaces this one. Nothing in
+       the unpacking script touches these two elements. Re-apply if these
+       bundles are regenerated. */
+    #__bundler_thumbnail, #__bundler_loading { display: none !important; }
   </style>
   <noscript>
     <style>#__bundler_loading { display: none; }</style>