Add a launch penalty warning on the sell confirmation modal for keys within the 7-day launch window

[Chucks1093]

Summary

Holders who try to sell within 7 days of a key's creation will incur a launch penalty fee. The sell confirmation modal should detect this and show a prominent warning with the penalty amount before the user signs the transaction.

Scope

• Fetch the key's createdAtLedger and launchPenaltyBps from the key detail API
• In the sell modal, check if the current ledger is within 7 days of createdAtLedger
• If within the launch window show a yellow warning box: 'Early sell penalty applies — [X]% will be deducted from your proceeds'
• Show the penalty amount deducted and the net proceeds after penalty in the fee breakdown
• Proceed normally if the key is past the 7-day launch window

Acceptance Criteria

• Warning shown when selling within the 7-day launch window
• Penalty amount and net proceeds displayed correctly
• Warning hidden when the key is past the launch window
• Fee breakdown updated to include the launch penalty line item
• User can still proceed with the sale after acknowledging the warning

ETA: 12 hours

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Coordinate on Telegram

[KunmiWrites-bit]

@KunmiWrites-bit has applied to work on this issue as part of the Stellar Wave Program's 8th wave.

Hi, I would love to fix this issue. Please assign to me.

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[Ajibose]

@Ajibose has applied to work on this issue as part of the Stellar Wave Program's 8th wave.

can i work on this

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[Bogunrot]

@Bogunrot has applied to work on this issue as part of the Stellar Wave Program's 8th wave.

I can work on this

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[Damilorlar]

@Damilorlar has applied to work on this issue as part of the Stellar Wave Program's 8th wave.

I would love to work on this project

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[drips-wave]

Congratulations, @Ajibose! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on August 31, 2026.

🧑‍💻 @Ajibose: Please resolve the issue such that the repo's maintainers have enough time to review your contribution before the due date. You'll earn Points for completing the issue on-time, which will make you eligible for a share of the Stellar Wave Program's reward pool.

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[drips-wave]

This issue has been marked as completed by a Drips Wave moderator for @Ajibose as part of the Stellar Wave Program's 8th Wave 🥳

Moderator's reason: [Auto-assessed] The PR successfully implements the launch penalty warning and fee breakdown updates required by issue #825, complete with thorough unit and integration test coverage. All CI checks are passing successfully with clean status, no maintainer objections exist, and the PR diff has 100% test coverage across reviewable changes.

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[grantfox-oss]

🎉 This issue has been marked as completed on GrantFox!

@Ajibose's PR #853 was approved and merged by @Chucks1093.

🏆 @Ajibose: You earned 40 FoxPoints for this contribution! Your current tier: Builder (1,942 total points). Track your full progress on GrantFox.

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