Standardize page wrappers, add showSocialShare prop, and add Cmd+K search

- Standardize all page wrappers to use consistent min-h-screen bg-background pattern
- Remove Layout wrapper usage from pages that had it
- Remove page-level SocialShare and headers, move into components
- Add showSocialShare prop to all interactive components for consistent control
- Add Cmd+K / Ctrl+K command palette search across all interactives
- Export allInteractives from InteractiveIndex for reuse

Co-Authored-By: Neeldhara Misra <mail@neeldhara.com>

src/pages/PebblePlacementGamePage.tsx

@@ -1,29 +1,13 @@
 import PebblePlacementGame from "@/components/PebblePlacementGame";
-import { useSearchParams } from "react-router-dom";
 
 const PebblePlacementGamePage = () => {
-  const [searchParams] = useSearchParams();
-  const from = searchParams.get('from');
-
-  if (from === 'puzzles') {
-    return (
-      <div className="min-h-screen bg-background">
-        <div className="container mx-auto px-4 py-8 space-y-6">
-          <div className="flex items-center gap-4">
-            <button 
-              onClick={() => window.location.href = '/themes/puzzles'}
-              className="text-primary hover:text-primary/80 font-medium"
-            >
-              ← Back to Puzzles
-            </button>
-          </div>
-          <PebblePlacementGame showSocialShare={true} />
-        </div>
+  return (
+    <div className="min-h-screen bg-background">
+      <div className="container mx-auto px-4 py-8">
+        <PebblePlacementGame showSocialShare={true} />
       </div>
-    );
-  }
-
-  return <PebblePlacementGame showSocialShare={true} />;
+    </div>
+  );
 };
 
-export default PebblePlacementGamePage;
+export default PebblePlacementGamePage;