Feat: upgrade to stellar-wallet-kits

[AlAfiz]

Context
Currently, we only support Freighter. We should support Albedo and xBull for broader access.

Technical Tasks

1. Replace direct Freighter API calls with @creit.tech/stellar-wallets-kit.
2. Update the ConnectWallet modal to allow the user to choose their preferred wallet.
3. Ensure the signing logic works consistently across all supported wallets.

Acceptance Criteria

• User can connect with Albedo or xBull.
• Transaction signing works for all 3 wallets.

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[onahiOMOTI]

@onahiOMOTI has applied to work on this issue as part of the Stellar Wave Program's 2nd wave.

i'm a fullstack blockchain dev, i can handle this.

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Congratulations, @onahiOMOTI! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on February 26, 2026.

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[bamiebot-maker]

@bamiebot-maker has applied to work on this issue as part of the Stellar Wave Program's 2nd wave.

Hi,can i take on on this?

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[deborahamoni0-prog]

@deborahamoni0-prog has applied to work on this issue as part of the Stellar Wave Program's 2nd wave.

hi please i would love to work on this issue , i'm a full-stack webdeveloper , and a smart contract developer , i can work on this issue well

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