Fix table row blink when cursor leaves the table

transition:all was firing on every row simultaneously when the cursor
left the table. Scoped it to background-color only. Also removed the
inset box-shadow from tr:hover which forced repaint layer thrashing.

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

assets/css/dashboard.css

@@ -321,7 +321,7 @@ a:not(.btn):hover::after {
 
 /* Smooth table row selection animation */
 tbody tr {
-    transition: all 0.2s ease;
+    transition: background-color 0.15s ease;
 }
 
 /* Button press effect */
@@ -1807,7 +1807,6 @@ th:has(input[type="checkbox"])::before {
 
 tr:hover {
     background-color: rgba(0, 255, 65, 0.08);
-    box-shadow: inset 0 0 20px rgba(0, 255, 65, 0.1);
 }
 
 /* Keyboard navigation selected row */