Remove tbody tr::before pseudo-element causing column misalignment

The ::before element on tbody tr was creating a blank column space
that didn't affect the thead, causing visual misalignment.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

assets/css/dashboard.css

@@ -322,21 +322,6 @@ a:not(.btn):hover::after {
 /* Smooth table row selection animation */
 tbody tr {
     transition: all 0.2s ease;
-    position: relative;
-}
-
-tbody tr::before {
-    content: '>';
-    position: absolute;
-    left: -20px;
-    opacity: 0;
-    color: var(--terminal-green);
-    transition: all 0.2s ease;
-}
-
-tbody tr:hover::before {
-    opacity: 1;
-    left: -15px;
 }
 
 /* Button press effect */