Update sales level styling and improve UI performance

- Standardize sales level color mapping across components
- Enhance delete button styling with flat variant and white text
- Improve stepper visualization with consistent color logic
- Optimize Safari scrolling performance with CSS transforms
- Add TypeScript casting for data operations

pages/dashboard/interest-list.vue

@@ -498,14 +498,31 @@ const getRelativeTime = (dateString: string) => {
   opacity: 1;
 }
 
-/* Safari-specific fixes */
+/* Safari-specific fixes and scrolling performance improvements */
 .modern-table :deep(.v-table__wrapper) {
   -webkit-transform: translateZ(0);
   transform: translateZ(0);
+  /* Improve scrolling performance */
+  will-change: scroll-position;
+  -webkit-backface-visibility: hidden;
+  backface-visibility: hidden;
 }
 
 .modern-table :deep(.v-data-table__td) {
   min-width: 0;
+  /* Optimize for better rendering */
+  contain: layout style paint;
+}
+
+/* Fix potential scrolling issues on desktop */
+.modern-table :deep(.v-table) {
+  table-layout: fixed;
+  width: 100%;
+}
+
+.modern-table :deep(tbody tr) {
+  /* Prevent sub-pixel rendering issues */
+  transform: translateZ(0);
 }
 
 /* Column width constraints */