style: increase sparkles particle count to 300

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: jmacot

password_template.html

@@ -542,7 +542,7 @@ <h1>/*[|template_title|]*/0</h1>
       if (window.matchMedia('(prefers-reduced-motion: reduce)').matches) return;
       var ctx = canvas.getContext('2d');
       var particles = [];
-      var count = 120;
+      var count = 300;
 
       function resize() {
         canvas.width = window.innerWidth;