refactor(control): implement ESLint -> remove unnecessary imports, improve general code quality

control/frontend/src/routes/+page.svelte

@@ -7,10 +7,8 @@
 		Trash2,
 		Menu,
 		ChevronDown,
-		icons,
 		SquareCheckBig,
 		Square,
-		X,
 		Info
 	} from 'lucide-svelte';
 	import Button from '$lib/components/Button.svelte';
@@ -73,13 +71,13 @@
 		const mac = text_inputs_valid.mac.value === '' ? null : text_inputs_valid.mac.value;
 		const name = text_inputs_valid.name.value;
 		let display: Display | null = null;
-		if (!!existing_display_id) {
+		if (existing_display_id) {
 			display = await edit_display_data(existing_display_id, ip, mac, name);
 		} else {
 			const status = await ping_ip(text_inputs_valid.ip.value);
 			display = await add_display(ip, mac, name, status);
 		}
-		if (!!display) {
+		if (display) {
 			await update_display_status(display);
 		}
 	}
@@ -179,6 +177,7 @@
 	};
 </script>
 
+<!-- eslint-disable-next-line @typescript-eslint/no-unused-vars -->
 {#snippet about_popup(_: string)}
 	<div class="px-2">
 		<p>
@@ -253,7 +252,7 @@
 		title="Anzeigename"
 		placeholder="z.B. Beamer vorne links"
 		is_valid_function={async (input: string) => {
-			if (!!existing_display_id) {
+			if (existing_display_id) {
 				if (input === (await get_display_by_id(existing_display_id))?.name)
 					return [true, 'Gültiger Name'];
 			}
@@ -317,7 +316,7 @@
 		{/if}
 		<Button
 			disabled={!all_text_inputs_valid()}
-			className="{!!existing_display_id ? 'px-4' : 'pl-3 pr-4 gap-2'} font-bold"
+			className="{existing_display_id ? 'px-4' : 'pl-3 pr-4 gap-2'} font-bold"
 			bg="bg-stone-650"
 			click_function={async () => {
 				await finalize_add_edit_display(existing_display_id);