Fix: duplicate waveOffset declaration crashing strict mode JS

The variable was declared on both line 830 (pulse wave) and line 900
(terminal demo), causing a SyntaxError in strict mode that killed
the entire script — hiding all sections below the hero.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: Gregg Cochran

site/index.html

@@ -897,7 +897,7 @@ <h2 class="section-title glow-green">Up and Running in 30 Seconds</h2>
   const heartbeats=['💗','💖','💓','❤️','💓','💗'];
   const W=59;
 
-  let waveOffset=0,heartIdx=0;
+  let heartIdx=0;
   let uptimeStart=Date.now();
   let bannerTyped=false;
   let waveTimer=null,heartTimer=null,uptimeTimer=null;