Added multiple components, added CodeMirror for body editor and added variable substitution for params and headers

src/lib/components/ui/select/select-scroll-down-button.svelte

@@ -0,0 +1,20 @@
+<script lang="ts">
+	import ChevronDownIcon from "@lucide/svelte/icons/chevron-down";
+	import { Select as SelectPrimitive } from "bits-ui";
+	import { cn, type WithoutChildrenOrChild } from "$lib/utils.js";
+
+	let {
+		ref = $bindable(null),
+		class: className,
+		...restProps
+	}: WithoutChildrenOrChild<SelectPrimitive.ScrollDownButtonProps> = $props();
+</script>
+
+<SelectPrimitive.ScrollDownButton
+	bind:ref
+	data-slot="select-scroll-down-button"
+	class={cn("flex cursor-default items-center justify-center py-1", className)}
+	{...restProps}
+>
+	<ChevronDownIcon class="size-4" />
+</SelectPrimitive.ScrollDownButton>