fix: move katex styling to global stylesheet

src/lib/components/chat/MarkdownRenderer.svelte

@@ -192,9 +192,3 @@
 		{/await}
 	{/if}
 {/each}
-
-<style lang="postcss">
-	:global(.katex-display) {
-		overflow: auto hidden;
-	}
-</style>

src/styles/main.css

@@ -15,3 +15,7 @@
 		@apply scrollbar-thin scrollbar-track-transparent scrollbar-thumb-black/10 scrollbar-thumb-rounded-full scrollbar-w-1 hover:scrollbar-thumb-black/20 dark:scrollbar-thumb-white/10 dark:hover:scrollbar-thumb-white/20;
 	}
 }
+
+.katex-display {
+	overflow: auto hidden;
+}