Function modernChaCha20Decrypt

modernChaCha20Decrypt(
options: ModernChaCha20DecryptOptions,
): Promise<ModernChaCha20DecryptResult>
Decrypt ChaCha20-Poly1305 ciphertext, preferring WebCrypto when available.

Expects format: base64(nonce (12B) || ciphertext || tag (16B)).
Parameters
- options: ModernChaCha20DecryptOptions
Returns Promise<ModernChaCha20DecryptResult>
Example
```
const result = await modernChaCha20Decrypt({
  key: "a".repeat(64),
  ciphertext: encrypted.ciphertext,
});
console.log(Buffer.from(result.plaintext).toString("utf8"));
```
- Defined in accel/webcrypto-modern.ts:330