SDK: Fix Safe wallet connection issues with WalletConnect (#8327)

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## PR-Codex overview

This PR addresses issues with the Safe wallet connection when using `WalletConnect`, ensuring better handling of account retrieval.

### Detailed summary

- Updated the comment for `account` retrieval to clarify that it grabs the address from mainnet if available.
- Modified the `firstAccountOn` function to return the first account from the session if no matching account is found.

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<!-- This is an auto-generated comment: release notes by coderabbit.ai -->

## Summary by CodeRabbit

* **Bug Fixes**
  * Fixed Safe wallet connection issues with WalletConnect

<!-- end of auto-generated comment: release notes by coderabbit.ai -->

Author: MananTank

.changeset/early-spoons-say.md

@@ -0,0 +1,5 @@
+---
+"thirdweb": patch
+---
+
+Fix Safe wallet connection issues with WalletConnect

packages/thirdweb/src/wallets/wallet-connect/controller.ts

@@ -157,7 +157,7 @@ export async function connectWC(
   );
   const currentChainId = chainsToRequest[0]?.split(":")[1] || 1;
   const providerChainId = normalizeChainId(currentChainId);
-  const account = firstAccountOn(provider.session, `eip155:1`); // grab the address from mainnet
+  const account = firstAccountOn(provider.session, `eip155:1`); // grab the address from mainnet if available
   const address = account;
   if (!address) {
     throw new Error("No accounts found on provider.");
@@ -291,7 +291,8 @@ function hasChainEnabled(session: WCSession, caip: string) {
 }
 function firstAccountOn(session: WCSession, caip: string): string | null {
   const ns = getNS(session);
-  const hit = ns?.accounts?.find((a) => a.startsWith(`${caip}:`));
+  const hit =
+    ns?.accounts?.find((a) => a.startsWith(`${caip}:`)) || ns?.accounts[0];
   return hit ? (hit.split(":")[2] ?? null) : null;
 }
 function anyRoutableChain(session: WCSession): string | null {