refactor: rename pastel app to color and update all references

components/ToolsGrid.tsx

@@ -2,17 +2,17 @@
 
 import { motion } from 'framer-motion';
 import ToolCard from './ToolCard';
-import { PastelIcon, UnitsIcon, FigletIcon, MediaIcon } from '@/components/AppIcons';
+import { ColorIcon, UnitsIcon, FigletIcon, MediaIcon } from '@/components/AppIcons';
 
 const tools = [
   {
-    title: 'Pastel',
+    title: 'Color',
     description: 'Modern color manipulation toolkit with palette generation, accessibility testing, and format conversion. Supports hex, RGB, HSL, Lab, and more.',
-    url: '/pastel',
+    url: '/color',
     gradient: 'gradient-indigo-purple',
     accentColor: '#a855f7',
     badges: ['Open Source', 'WCAG', 'Free'],
-    icon: <PastelIcon className="w-12 h-12 text-white" />,
+    icon: <ColorIcon className="w-12 h-12 text-white" />,
   },
   {
     title: 'Units',