Fix ascii-frame-outer blink caused by JS/CSS hover conflict

JS mouseenter/mouseleave handlers were setting row.style.backgroundColor
inline, fighting with the CSS tr:hover rule. On mouseleave both fired
simultaneously causing a double repaint / blink. Removed the redundant
JS handlers — the CSS tr:hover transition already handles this cleanly.

Also removed body flicker animation from base.css (was still present
after being removed from dashboard.css).

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

assets/js/dashboard.js

@@ -1005,14 +1005,6 @@ document.addEventListener('DOMContentLoaded', function() {
             }
         });
         
-        // Add hover effect
-        row.addEventListener('mouseenter', function() {
-            this.style.backgroundColor = 'rgba(0, 255, 65, 0.08)';
-        });
-        
-        row.addEventListener('mouseleave', function() {
-            this.style.backgroundColor = '';
-        });
     });
 });