Feature: Support Freighter wallet directly in SDK

[Jaydbrown]

Context

Currently, the user must implement a custom signer interface to connect Freighter to the SDK. Since Freighter is the most popular wallet on Stellar, we should provide a first-party connector.

Requirements

• Add a FreighterConnector class implementing IWalletConnector.
• It should handle signTransaction and signAuthEntry.
• Automatically detect if window.freighter is available and throw a specific WalletNotInstalledError if not.

[Viky207]

@Viky207 has applied to work on this issue as part of the Stellar Wave Program's 7th wave.

hello can i work on this issue

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[drips-wave]

Congratulations, @Viky207! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on July 30, 2026.

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