refactor: standardize background color to #121212

- Replaced inconsistent gray-900 and #171717 background colors with unified #121212 across all pages
- Removed unused imports from multiple component files
- Cleaned up trailing spaces in className attributes

src/pages/home/CallToAction.tsx

@@ -3,9 +3,9 @@ import { Button } from '@/components/Button'
 
 export function CallToAction() {
   return (
-    <section className='relative overflow-hidden bg-gray-900'>
+    <section className='relative overflow-hidden bg-[#121212]'>
     {/* ✅ Top horizontal line with spacing */}
-    <div className="max-w-7xl  bg-[#111111] mx-auto py-6 border border-t-0 border-b-0 border-gray-800"></div>
+    <div className="max-w-7xl  bg-[#121212] mx-auto py-6 border border-t-0 border-b-0 border-gray-800"></div>
     {/* === Content === */}
     <div className="w-full border-t border-l border-r border-gray-800 " />
       <div