EsLint v9 (#154)

* Upgrade ESLint and related configurations to version 9

- Update ESLint to version 9.19.0
- Migrate ESLint configurations to flat config format
- Remove deprecated ESLint config files
- Update package dependencies and configurations
- Simplify ESLint setup across packages
- Remove unnecessary ESLint config blocks from package.json files
- Improved CI caching with Turborepo tasks
- Removed duplicate styles

packages/ui/src/shadcn/separator.tsx

@@ -18,7 +18,7 @@ const Separator: React.FC<
     decorative={decorative}
     orientation={orientation}
     className={cn(
-      'shrink-0 bg-border',
+      'bg-border shrink-0',
       orientation === 'horizontal' ? 'h-[1px] w-full' : 'h-full w-[1px]',
       className,
     )}