[portal] fix Tailwind style ordering issue

apps/portal/tailwind.config.cjs

@@ -0,0 +1,9 @@
+const config = require('@tih/tailwind-config/tailwind.config.js');
+
+/** @type {import('tailwindcss').Config} */
+module.exports = {
+  ...config,
+  // Extract styles from ui package instead of importing the ui package's generated CSS
+  // file as the importing approach runs into style ordering issues.
+  content: [...config.content, './../../packages/ui/src/**/*.{ts,tsx}'],
+};