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/network/Hero.tsx

@@ -2,7 +2,7 @@ import { useId } from 'react'
 import { Container } from '@/components/Container'
 import { Button } from '@/components/Button'
 import phoneFrame from '../../images/phoneframe.png'
-import { H3, Eyebrow, P, CT, CP } from "@/components/Texts";
+import { H3, P, CT } from "@/components/Texts";
 
 function BackgroundIllustration(props: React.ComponentPropsWithoutRef<'div'>) {
   let id = useId()