feat: api key authentication (#291)

Co-authored-by: Elias Schneider <login@eliasschneider.com>

frontend/src/lib/components/ui/calendar/calendar-next-button.svelte

@@ -0,0 +1,27 @@
+<script lang="ts">
+	import { Calendar as CalendarPrimitive } from "bits-ui";
+	import ChevronRight from "lucide-svelte/icons/chevron-right";
+	import { buttonVariants } from "$lib/components/ui/button/index.js";
+	import { cn } from "$lib/utils/style.js";
+
+	type $$Props = CalendarPrimitive.NextButtonProps;
+	type $$Events = CalendarPrimitive.NextButtonEvents;
+
+	let className: $$Props["class"] = undefined;
+	export { className as class };
+</script>
+
+<CalendarPrimitive.NextButton
+	on:click
+	class={cn(
+		buttonVariants({ variant: "outline" }),
+		"h-7 w-7 bg-transparent p-0 opacity-50 hover:opacity-100",
+		className
+	)}
+	{...$$restProps}
+	let:builder
+>
+	<slot {builder}>
+		<ChevronRight class="h-4 w-4" />
+	</slot>
+</CalendarPrimitive.NextButton>