[Portal] update docs on pre-generation and account abstraction (#5912)

https://linear.app/thirdweb/issue/TOOL-2988/update-docs-to-call-out-pregeneration-caveats

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## PR-Codex overview
This PR focuses on enhancing documentation and functionality related to wallet connections and smart accounts in the `thirdweb` library, particularly emphasizing account abstraction and the use of smart wallets.

### Detailed summary
- Added `backend` to the `AuthList` component in `AuthList.tsx`.
- Updated documentation in `ConnectEmbed.tsx` and `ConnectButton.tsx` regarding ecosystem wallets and account abstraction.
- Introduced a warning callout in `page.mdx` for generating smart wallet addresses using `predictSmartAccountAddress`.

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apps/portal/src/app/connect/wallet/pregenerate-wallets/page.mdx

@@ -115,6 +115,11 @@ A successful API call returns a JSON object in the following format:
 }
 ```
 
+<Callout variant='warning' title='Smart Wallet Address'>
+Use [`predictSmartAccountAddress`](/references/typescript/v5/predictSmartAccountAddress) to generate the corresponding smart wallet address.
+The `address` field always corresponds to the EOA address that has been pregenerated.
+</Callout>
+
 
 ## What's Next
 

apps/portal/src/components/Document/AuthList.tsx

@@ -21,6 +21,7 @@ const authOptions: InAppWalletAuth[] = [
   "line",
   "coinbase",
   "steam",
+  "backend",
 ];
 
 export function AuthList() {

packages/thirdweb/src/react/web/ui/ConnectWallet/ConnectButton.tsx

@@ -111,6 +111,8 @@ const TW_CONNECT_WALLET = "tw-connect-wallet";
  * />;
  * ```
  *
+ * Note that this prop doesn't affect ecosystem wallets. Ecosystem wallets will only be converted to smart accounts if the ecosystem owner has enabled account abstraction.
+ *
  * ### Enabling sign in with ethereum (Auth)
  *
  * ```tsx

packages/thirdweb/src/react/web/ui/ConnectWallet/Modal/ConnectEmbed.tsx

@@ -110,6 +110,7 @@ import { useSetupScreen } from "./screen.js";
  * }}
  * />;
  * ```
+ * Note that this prop doesn't affect ecosystem wallets. Ecosystem wallets will only be converted to smart accounts if the ecosystem owner has enabled account abstraction.
  *
  * ### Enabling sign in with ethereum (Auth)
  *