Fix crypto.randomUUID crash on non-HTTPS origins

Replace all crypto.randomUUID() calls with a uuid() utility that
falls back to Math.random-based generation when the Web Crypto API
is unavailable (plain HTTP contexts).

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

apps/web/src/pages/DataPage.tsx

@@ -1,7 +1,7 @@
 import { useState } from 'react';
 import { Database, ShoppingCart, Zap } from 'lucide-react';
 import { useGameStore } from '@/store';
-import { formatNumber, formatMoney } from '@ai-tycoon/shared';
+import { formatNumber, formatMoney, uuid } from '@ai-tycoon/shared';
 import type { OwnedDataset, DataDomain } from '@ai-tycoon/shared';
 
 interface MarketplaceDataset {
@@ -49,7 +49,7 @@ export function DataPage() {
 
   const handlePurchase = (item: MarketplaceDataset) => {
     const dataset: OwnedDataset = {
-      id: crypto.randomUUID(),
+      id: uuid(),
       name: item.name,
       domain: item.domain,
       sizeTokens: item.sizeTokens,