refactor(css): remove colors/fonts from tailwind.config.js — layout.css is sole theme source

All color and font definitions live in layout.css via Tailwind 4 @theme.
Keeping only the content glob in the config file.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

frontend/tailwind.config.js

@@ -1,25 +1,4 @@
 /** @type {import('tailwindcss').Config} */
 export default {
-	content: ['./src/**/*.{html,js,svelte,ts}'],
-	theme: {
-		extend: {
-			colors: {
-				brand: {
-					navy: '#002850', // Header & Hero background
-					mint: '#A6DAD8', // The Comma accent color
-					sand: '#E4E2D7', // Content background
-					white: '#ffffff'
-				}
-			},
-			fontFamily: {
-				// Montserrat for UI/Headers, Merriweather for Body text (as established previously)
-				sans: ['Montserrat', 'sans-serif'],
-				serif: ['Merriweather', 'serif']
-			},
-			fontSize: {
-				huge: '4rem' // For the large stats numbers (e.g., "29", "5000+")
-			}
-		}
-	},
-	plugins: []
+	content: ['./src/**/*.{html,js,svelte,ts}']
 };