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/input/index.js

@@ -1,7 +1,7 @@
-import Root from "./input.svelte";
+import Root from './input.svelte';
 
 export {
 	Root,
 	//
-	Root as Input,
+	Root as Input
 };