feat: one gateway port with path-mounted frontends, markdown chat, collapsible sidebars

ui/src/lib/panel/markdown.svelte

@@ -0,0 +1,14 @@
+<script lang="ts">
+  import { cn } from "$lib/utils";
+  import { renderMarkdown } from "./markdown";
+
+  let { text, class: className = "" }: { text: string; class?: string } =
+    $props();
+
+  const html = $derived(renderMarkdown(text));
+</script>
+
+<div class={cn("prose prose-sm max-w-none", className)}>
+  <!-- eslint-disable-next-line svelte/no-at-html-tags -- sanitized in renderMarkdown -->
+  {@html html}
+</div>