feat: Migrate ESLint to flat config and resolve initial linting errors

Migrated the ESLint configuration to the new flat config format ()
and addressed several initial linting errors.

Key changes include:
- Updated ESLint configuration to treat  as warnings instead of errors.
- Fixed  errors in  by declaring  and .
- Corrected  error in  by using  instead of an out-of-scope .
- Resolved  error in  by replacing the undefined  directive with the  component.
- Addressed  errors in  by replacing  with  and  with .
- Fixed  errors in  by importing necessary modules (, , ) and adding missing props (, , , , ).

src/lib/components/ui/button/index.ts

@@ -2,8 +2,8 @@ import Root, {
 	type ButtonProps,
 	type ButtonSize,
 	type ButtonVariant,
-	buttonVariants,
-} from "./button.svelte";
+	buttonVariants
+} from './button.svelte';
 
 export {
 	Root,
@@ -13,5 +13,5 @@ export {
 	buttonVariants,
 	type ButtonProps,
 	type ButtonSize,
-	type ButtonVariant,
+	type ButtonVariant
 };