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/popover/index.ts

@@ -1,5 +1,5 @@
-import { Popover as PopoverPrimitive } from "bits-ui";
-import Content from "./popover-content.svelte";
+import { Popover as PopoverPrimitive } from 'bits-ui';
+import Content from './popover-content.svelte';
 const Root = PopoverPrimitive.Root;
 const Trigger = PopoverPrimitive.Trigger;
 const Close = PopoverPrimitive.Close;
@@ -13,5 +13,5 @@ export {
 	Root as Popover,
 	Content as PopoverContent,
 	Trigger as PopoverTrigger,
-	Close as PopoverClose,
+	Close as PopoverClose
 };