Remove finale page from book interior

The cover PDF serves this purpose. Removes the page--finale template
block, the finale data loading path in build.js, and all finale CSS.
Page count: 100 → 99 (imprint + title + TOC + 96 scene pages).

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

styles/layout.css

@@ -119,26 +119,3 @@
   padding: 0 0.8in;
 }
 
-/* ── Finale page ── */
-.page--finale {
-  background: var(--midnight, #0d0d2b);
-  position: relative;
-}
-
-.finale-image {
-  width: 100%;
-  height: 100%;
-  object-fit: cover;
-}
-
-.finale-overlay {
-  position: absolute;
-  inset: 0;
-  display: flex;
-  flex-direction: column;
-  align-items: center;
-  justify-content: flex-end;
-  padding-bottom: 1in;
-  text-align: center;
-  background: linear-gradient(to top, rgba(13, 13, 43, 0.75) 0%, transparent 55%);
-}