fix: show chain selector for single-chain apps

[ayaanoncrypto]

Summary

Closes #1418.

Render the current chain selector whenever a connected account has chain data. Single-chain applications now show the active chain in the Connect Button, matching multi-chain and unsupported-chain behavior.

Testing

• git diff --check passed.
• • Reviewed the existing ConnectButton rendering path.
• • The focused test command was attempted, but local Prettier and Vitest binaries were unavailable. The repository’s CI should run the full suite.

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[changeset-bot]

🦋 Changeset detected

Latest commit: e2fbddf

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 18 packages

Name	Type
@rainbow-me/rainbowkit	Patch
example	Patch
@rainbow-me/rainbow-button	Patch
rainbowkit-next-app	Patch
site	Patch
with-create-react-app	Patch
with-next-app-i18n	Patch
with-next-app	Patch
with-next-custom-button	Patch
with-next-mint-nft	Patch
with-next-siwe-iron-session	Patch
with-next-siwe-next-auth	Patch
with-next-wallet-button	Patch
with-next	Patch
with-react-router	Patch
with-remix	Patch
with-vite	Patch
with-next-rainbow-button	Patch

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[chatgpt-codex-connector]

Add a changeset for the ConnectButton behavior change

This alters user-facing behavior in the published @rainbow-me/rainbowkit package, but the commit includes no .changeset entry. Without a patch changeset, the release workflow will not record or version this fix for consumers; add one covering the core package.

AGENTS.md reference: AGENTS.md:L99-L104

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