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/dropdown-menu/dropdown-menu-sub-trigger.svelte

@@ -1,7 +1,7 @@
 <script lang="ts">
-	import { DropdownMenu as DropdownMenuPrimitive } from "bits-ui";
-	import ChevronRight from "lucide-svelte/icons/chevron-right";
-	import { cn } from "$lib/utils/utils.js";
+	import { DropdownMenu as DropdownMenuPrimitive } from 'bits-ui';
+	import ChevronRight from 'lucide-svelte/icons/chevron-right';
+	import { cn } from '$lib/utils/utils.js';
 
 	let {
 		ref = $bindable(null),
@@ -17,8 +17,8 @@
 <DropdownMenuPrimitive.SubTrigger
 	bind:ref
 	class={cn(
-		"data-[highlighted]:bg-accent data-[state=open]:bg-accent flex cursor-default select-none items-center gap-2 rounded-sm px-2 py-1.5 text-sm outline-hidden [&_svg]:pointer-events-none [&_svg]:size-4 [&_svg]:shrink-0",
-		inset && "pl-8",
+		'data-[highlighted]:bg-accent data-[state=open]:bg-accent flex cursor-default select-none items-center gap-2 rounded-sm px-2 py-1.5 text-sm outline-hidden [&_svg]:pointer-events-none [&_svg]:size-4 [&_svg]:shrink-0',
+		inset && 'pl-8',
 		className
 	)}
 	{...restProps}