feat(KB-658): tighten dashboard list view column sizing

- Reduce the list view ID column to a fixed 70px width
- Preserve full-width title cells so task titles use the remaining space
- Resolve the styles.css merge conflict by combining both list layout adjustments
- Verify the workspace build succeeds with pnpm build

packages/dashboard/app/styles.css

@@ -5535,6 +5535,8 @@ body {
 /* Set width on ID column header to match data cells */
 .list-table th:nth-child(2).list-header-cell {
   width: 70px;
+  min-width: 70px;
+  max-width: 70px;
 }
 
 .list-header-cell:hover {