Revert: Remove loading spinner - was slowing down page

Suspense boundary added complexity and extra queries, making pages slower.
Removed the LoadingSpinner component and Suspense wrapping.

Reverted to simpler, faster approach.

Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>

src/components/LoadingSpinner.tsx

@@ -1,10 +0,0 @@
-export default function LoadingSpinner() {
-  return (
-    <div className="flex items-center justify-center py-24">
-      <div className="relative h-12 w-12">
-        <div className="absolute inset-0 rounded-full border-4 border-line"></div>
-        <div className="absolute inset-0 animate-spin rounded-full border-4 border-transparent border-t-ink"></div>
-      </div>
-    </div>
-  );
-}