Playground: Fix ConnectEmbed width (#8132)

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## PR-Codex overview
This PR focuses on refining the styling of components in the `playground-web` application by removing unnecessary CSS classes that limit width.

### Detailed summary
- In `styled-connect-embed.tsx`, removed the class `!max-w-full`.
- In `RightSection.tsx`, changed the class from `!max-w-full` to `shadow-xl`, removing the width constraint.

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

## Summary by CodeRabbit

* **Style**
  * Updated Connect modal styling for sign-in: removed restrictive max-width constraint to improve responsiveness and layout in the RightSection.
  * Simplified styling by removing custom class overrides from the styled Connect component, relying on default styles for more consistent appearance.
  * Result: more reliable modal sizing, better visual consistency, and cleaner presentation across themes and wallet variants.

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

Author: MananTank

apps/playground-web/src/app/wallets/sign-in/button/RightSection.tsx

@@ -197,7 +197,7 @@ export function RightSection(props: {
                 }
                 auth={connectOptions.enableAuth ? playgroundAuth : undefined}
                 autoConnect={false}
-                className="shadow-xl !max-w-full"
+                className="shadow-xl"
                 client={THIRDWEB_CLIENT}
                 header={{
                   title: connectOptions.modalTitle,

apps/playground-web/src/components/styled-connect-embed.tsx

@@ -49,7 +49,6 @@ export function StyledConnectEmbed(
         abstract,
       ]}
       client={THIRDWEB_CLIENT}
-      className="!max-w-full"
       theme={theme === "light" ? "light" : "dark"}
       wallets={WALLETS}
       {...props}