style: Increase contrast for better readability

Override Tailwind zinc scale with brighter values for improved text contrast on dark backgrounds. Targets older users who may have difficulty reading gray-on-black text.

- zinc-500: #71717a → #8a8a95 (+20% brightness)
- zinc-600: #52525b → #6b6b75 (+25% brightness)
- zinc-400/700 also adjusted proportionally

tailwind.config.ts

@@ -8,6 +8,23 @@ const config: Config = {
     ],
     theme: {
         extend: {
+            // High-contrast zinc scale for better readability
+            // Original zinc-500 (#71717a) is now brighter for better contrast on dark backgrounds
+            colors: {
+                zinc: {
+                    50: '#fafafa',
+                    100: '#f4f4f5',
+                    200: '#e4e4e7',
+                    300: '#d4d4d8',
+                    400: '#a8a8b3',  // Brighter (was #a1a1aa)
+                    500: '#8a8a95',  // Brighter (was #71717a) - main secondary text
+                    600: '#6b6b75',  // Brighter (was #52525b) - subtle text
+                    700: '#4a4a52',  // Brighter (was #3f3f46)
+                    800: '#2a2a2e',  // Slightly adjusted
+                    900: '#1a1a1e',  // Dark background
+                    950: '#0d0d0f',  // Darkest
+                },
+            },
             backgroundImage: {
                 "gradient-radial": "radial-gradient(var(--tw-gradient-stops))",
                 "gradient-conic":