feat: add cross-environment crypto adapter

- Create getCryptoRandomValues() utility
- Support both window.crypto (browser/Electron) and crypto.webcrypto (Node.js)
- Add comprehensive test coverage for adapter functionality

src/utils/crypto-adapter.ts

@@ -0,0 +1,36 @@
+/**
+ * Cross-environment crypto adapter
+ * Provides unified access to cryptographically secure random number generation
+ * Works in both browser/Electron (window.crypto) and Node.js (crypto.webcrypto)
+ */
+
+/**
+ * Gets the appropriate Crypto interface for the current environment
+ * @returns Crypto interface with getRandomValues method
+ * @throws Error if no crypto API is available
+ */
+function getCrypto(): Crypto {
+	// Browser/Electron environment
+	if (typeof window !== 'undefined' && window.crypto) {
+		return window.crypto;
+	}
+
+	// Node.js environment (15+) - uses Web Crypto API standard
+	if (typeof global !== 'undefined') {
+		const nodeCrypto = require('crypto');
+		if (nodeCrypto.webcrypto) {
+			return nodeCrypto.webcrypto;
+		}
+	}
+
+	throw new Error('No Web Crypto API available in this environment');
+}
+
+/**
+ * Fills a typed array with cryptographically secure random values
+ * @param array TypedArray to fill with random values
+ * @returns The same array filled with random values
+ */
+export function getCryptoRandomValues<T extends ArrayBufferView>(array: T): T {
+	return getCrypto().getRandomValues(array);
+}