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/App.tsx

@@ -3,6 +3,7 @@ import { Toaster as Sonner } from "@/components/ui/sonner";
 import { TooltipProvider } from "@/components/ui/tooltip";
 import { QueryClient, QueryClientProvider } from "@tanstack/react-query";
 import ErrorBoundary from "@/components/ErrorBoundary";
+import CommandSearch from "@/components/CommandSearch";
 import { BrowserRouter, Routes, Route } from "react-router-dom";
 import Index from "./pages/Index";
 import InteractiveIndex from "./components/InteractiveIndex";
@@ -78,6 +79,7 @@ const App = () => (
         <Toaster />
         <Sonner />
         <BrowserRouter>
+        <CommandSearch />
         <Routes>
           <Route path="/" element={<Index />} />
           <Route path="/index" element={<InteractiveIndex />} />