feat: add Tailwind CSS via its own CLI

tailwind.config.js

@@ -0,0 +1,36 @@
+/** @type {import('tailwindcss').Config} */
+module.exports = {
+    content: [
+        './templates/**/*.twig',
+        // Class strings built in PHP (badge/status helpers) are purged without this.
+        './src/**/*.php',
+    ],
+    theme: {
+        container: {
+            center: true,
+            padding: '2rem',
+        },
+        extend: {
+            fontFamily: {
+                sans: ['Lato', 'sans-serif'],
+            },
+            // EP house palette, ported from myep. Its per-brand palettes (sbw/snz/ser)
+            // are a multi-brand concern that does not apply to an internal tool.
+            colors: {
+                primary: '#3d8ccb',
+                secondary: '#f9c700',
+                'primary-bg': '#ebf3fa',
+                'primary-light': '#0070e0',
+                'primary-medium': '#165883',
+                'primary-dark': '#18527b',
+                pink: '#fa1a8c',
+            },
+            backgroundImage: {
+                'brand-gradient': 'linear-gradient(to top right, #009fff, #165883, #18527b)',
+            },
+        },
+    },
+    plugins: [
+        require('@tailwindcss/forms'),
+    ],
+}