feat(web3): convert signature Uint8Array to base64 string in generateWeb3Signature

Signed-off-by: Kenton Duprey <kenton@clerk.dev>

Author: kduprey

packages/clerk-js/src/utils/web3.ts

@@ -62,7 +62,8 @@ export const generateWeb3Signature: GenerateSignature = async (params): Promise<
         account: walletAccount,
         message: new TextEncoder().encode(nonce),
       });
-      return signedMessages?.[0]?.signature ? Array.from(signedMessages[0].signature).toString() : '';
+      // Convert signature Uint8Array to base64 string
+      return signedMessages?.[0]?.signature ? btoa(String.fromCharCode(...signedMessages[0].signature)) : '';
     } catch (err) {
       if (err instanceof Error && err.message.includes('User rejected the request.')) {
         throw new ClerkRuntimeError('Web3 signature request was rejected by the user.', {