fix: make equations horizontally scrollable when they overflow

src/lib/components/chat/MarkdownRenderer.svelte

@@ -121,3 +121,9 @@
 		{/if}
 	{/each}
 </div>
+
+<style lang="postcss">
+	:global(.katex-display) {
+		overflow: auto hidden;
+	}
+</style>