🎨 Add Table of Contents component and type definitions

src/components/tableOfContents/tableOfContents.svelte

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+<script lang="ts">
+  import type { TableOfContentsProps } from "./toc.types";
+  import { cn } from "@/utils/cn";
+
+  let { toc, className }: TableOfContentsProps = $props();
+</script>
+
+<div
+  class={cn(
+    "flex flex-col text-sm text-neutral-600 dark:text-neutral-400",
+    className,
+  )}
+>
+  {#each toc as tocItem (tocItem.id)}
+    <a
+      href={"#" + tocItem.slug}
+      class={cn(
+        "pt-1 pb-1.5 transition-colors hover:text-neutral-900 dark:hover:text-neutral-50",
+        tocItem.level === 2 && "ml-0 font-medium",
+        tocItem.level === 3 &&
+          "border-l border-neutral-200 pl-4 dark:border-neutral-800",
+        tocItem.level === 4 && "ml-8",
+      )}
+    >
+      {tocItem.text}
+    </a>
+  {/each}
+</div>

src/components/tableOfContents/toc.types.ts

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+import type { ToCItem } from "@/markdown/generateToC";
+
+export interface TableOfContentsProps {
+  toc: ToCItem[];
+  className?: string;
+}