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/makerkit/spinner.tsx

@@ -10,7 +10,7 @@ export function Spinner(
       <svg
         aria-hidden="true"
         className={cn(
-          `h-8 w-8 animate-spin fill-primary-foreground text-primary dark:fill-primary dark:text-primary/30`,
+          `fill-primary-foreground text-primary dark:fill-primary dark:text-primary/30 h-8 w-8 animate-spin`,
           props.className,
         )}
         viewBox="0 0 100 101"