Fix/katex rendering issue 1213 (#1223)

.gitignore

@@ -23,6 +23,7 @@ yarn-debug.log*
 yarn-error.log*
 .pnpm-debug.log*
 
+
 # local env files
 .env.local
 .env.development.local

app/globals.css

@@ -3,6 +3,9 @@
 /* include utility classes in streamdown */
 @source '../node_modules/streamdown/dist/index.js';
 
+/* Add KaTeX CSS for math rendering */
+@import 'katex/dist/katex.min.css';
+
 /* custom variant for setting dark mode programmatically */
 @custom-variant dark (&:is(.dark, .dark *));