Add helper for detecting whether a Stellar address belongs to the connected wallet

[Chucks1093]

Summary

Several UI interactions — showing edit controls, hiding sell buttons for non-holders — depend on whether the viewing wallet is the owner of a resource. A shared helper that compares a target address against the connected wallet address should be used consistently across these checks.

Scope

• Add isOwnWallet(address: string, connectedAddress: string | null): boolean utility
• Returns false when connectedAddress is null (wallet not connected)
• Comparison is case-insensitive to handle address casing differences
• Add unit tests for: matching addresses, non-matching, null connected address, different casing

Acceptance Criteria

• Returns true for matching addresses
• Returns false for non-matching addresses
• Returns false when connected address is null
• Case-insensitive comparison

ETA: 12 hours

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Coordinate on Telegram

[Martins-594]

Hi, I'd like to work on this issue. I've gone through the description and acceptance criteria and I'm confident I can deliver it. I'll make sure every acceptance criterion is met and submit a clean, tested PR. Please assign it to me.

[Naajih09]

Hi, maintainer I'd like to work on this issue. I've gone through the description and acceptance criteria and I'm confident I can deliver it. I'll make sure every acceptance criterion is met and submit a clean, tested PR. Please assign it to me.

[Empire050]

​Hi boss,
​I'd love to work on this issue. It seems like a great fit, and I'm ready to dive into the codebase to get it resolved. Could you please assign it to me?
​Thanks.

[Benedict315]

Hello please assign

[grantfox-oss]

🦊 GrantFox — @Benedict315 has been assigned to this issue as part of the Official Campaign | FWC26 campaign!

Next steps:

1. Open a Pull Request referencing this issue (e.g., Closes #530)
2. Your PR will be reviewed by the accesslayerorg maintainers

Good luck! Track your progress on GrantFox.

[grantfox-oss]

🎉 This issue has been marked as completed on GrantFox as part of the Official Campaign | FWC26 campaign!

@Benedict315's PR #543 was approved and merged by @Chucks1093.

🏆 @Benedict315: You earned 35 FoxPoints for this contribution! Your current tier: Explorer (726 total points). Track your full progress on GrantFox.

👏 Great work, @Benedict315! Keep contributing to accesslayerorg.