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/compute/ComputeCodeTabs.tsx

@@ -72,7 +72,7 @@ export function ComputeCodeTabs() {
         />
 
         <div className="mx-auto max-w-2xl sm:mx-0 sm:max-w-none">
-          <div className="w-screen overflow-hidden rounded-tl-xl bg-gray-900 ring-1 ring-white/10">
+          <div className="w-screen overflow-hidden rounded-tl-xl bg-[#121212]  ring-1 ring-white/10">
 
             {/* FILE TABS */}
             <div className="flex bg-gray-800/40 ring-1 ring-white/5">