feat: remove supported-platforms feature gate

[broody]

Summary

This PR removes the supported-platforms feature flag, enabling all network platforms by default in the wallet selection drawer.

Changes

packages/keychain/src/components/purchasenew/checkout/onchain/wallet-drawer.tsx

• Removed the isSupportedPlatformsEnabled feature flag hook call
• Updated selectedNetworks useMemo to always include all platforms: starknet, ethereum, base, arbitrum, and optimism
• Removed isSupportedPlatformsEnabled from the dependency array
• Minor formatting improvements

packages/keychain/src/hooks/features.tsx

• Removed supported-platforms from the Feature type union

Result

All network platforms are now always available in the wallet selection drawer without requiring feature flag enablement.

[vercel]

The latest updates on your projects. Learn more about Vercel for GitHub.

Project	Deployment	Review	Updated (UTC)
controller-example-next	Ready	Preview	Jan 21, 2026 8:56pm
keychain	Ready	Preview	Jan 21, 2026 8:56pm
keychain-storybook	Ready	Preview	Jan 21, 2026 8:56pm

[claude]

Code review

No issues found. Checked for bugs and CLAUDE.md compliance.

[claude]

Claude finished @broody's task —— View job

---

Analyzing controller changes and updating documentation

I'll analyze the PR changes that removed the supported-platforms feature gate and determine if any documentation updates are needed in the docs repository.

Todo List:

• Check the docs-repo directory structure and existing documentation
• Review the changed files to understand the technical changes
• Assess if the feature flag removal affects user-facing documentation
• Update documentation if needed or confirm no updates required

Analysis of Changes:
The PR removed the supported-platforms feature flag, which was used to conditionally enable network platforms in the wallet selection drawer. Key changes:

1. wallet-drawer.tsx: Removed isSupportedPlatformsEnabled feature flag check and now always includes all platforms (starknet, ethereum, base, arbitrum, optimism) in mainnet
2. features.tsx: Removed supported-platforms from the Feature type union

Documentation Assessment:
After reviewing the documentation files in the docs-repo, I found:

1. No direct references to the supported-platforms feature flag in any documentation files
2. No impact on user-facing features - This was an internal feature flag that controlled platform availability behind the scenes
3. No API or configuration changes - Users don't directly interact with or configure this feature flag

Conclusion:
No documentation updates are required. The removal of the supported-platforms feature flag is an internal implementation detail that:

• Does not change any user-facing APIs or configuration options
• Does not affect the documented behavior of the Controller SDK
• Simply makes all network platforms (ethereum, base, arbitrum, optimism) always available instead of being conditionally enabled
• Has no impact on the existing documentation for starterpacks, coinbase onramp, signer management, or other features

The change improves user experience by ensuring all supported networks are always available without requiring feature flag configuration, but this doesn't necessitate any documentation updates.