añadido componente para crear posts y modificado menu auth

src/lib/components/ui/input-group/input-group-button.svelte

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+<script lang="ts" module>
+	import { tv, type VariantProps } from "tailwind-variants";
+
+	const inputGroupButtonVariants = tv({
+		base: "flex items-center gap-2 text-sm shadow-none",
+		variants: {
+			size: {
+				xs: "h-6 gap-1 rounded-[calc(var(--radius)-5px)] px-2 has-[>svg]:px-2 [&>svg:not([class*='size-'])]:size-3.5",
+				sm: "h-8 gap-1.5 rounded-md px-2.5 has-[>svg]:px-2.5",
+				"icon-xs": "size-6 rounded-[calc(var(--radius)-5px)] p-0 has-[>svg]:p-0",
+				"icon-sm": "size-8 p-0 has-[>svg]:p-0",
+			},
+		},
+		defaultVariants: {
+			size: "xs",
+		},
+	});
+
+	export type InputGroupButtonSize = VariantProps<typeof inputGroupButtonVariants>["size"];
+</script>
+
+<script lang="ts">
+	import { cn } from "$lib/utils.js";
+	import type { ComponentProps } from "svelte";
+	import { Button } from "$lib/components/ui/button/index.js";
+
+	let {
+		ref = $bindable(null),
+		class: className,
+		children,
+		type = "button",
+		variant = "ghost",
+		size = "xs",
+		...restProps
+	}: Omit<ComponentProps<typeof Button>, "href" | "size"> & {
+		size?: InputGroupButtonSize;
+	} = $props();
+</script>
+
+<Button
+	bind:ref
+	{type}
+	data-size={size}
+	{variant}
+	class={cn(inputGroupButtonVariants({ size }), className)}
+	{...restProps}
+>
+	{@render children?.()}
+</Button>