fix(dashpay): keep marketplace sheets alive during PIN auth

[PastaPastaPasta]

Issue being fixed or feature implemented

Secondary username registration could not complete with wallet PIN authentication. The registration sheet dismissed as soon as the asynchronous action started, which removed the SwiftUI/UIKit presentation host while the PIN controller was still being presented. The authentication controller then failed before the user could enter the PIN. Face ID usually completed quickly enough to avoid the race.

What was done?

• Keep marketplace action sheets attached through authentication and Platform execution.
• Dismiss sheets only after the operation succeeds.
• Disable interactive sheet dismissal while an action is running.
• Keep progress visible in the active sheet during authentication and execution.
• Apply the lifecycle-safe behavior consistently to registration, contested-name requests, purchases, listings, delisting, and transfers.

How Has This Been Tested?

• Built the dashpay Debug scheme from the rebased PR revision for an iOS 26.5 iPhone 17 Pro simulator.
• Installed and launched org.dashfoundation.dash; verified the process remained alive after stabilization.
• Manually completed the secondary username registration flow using PIN authentication on a simulator without Face ID; registration succeeded without Authentication failed.
• Performed a self-review covering success, cancellation, and error paths.

Breaking Changes

None.

Checklist:

• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have added or updated relevant unit/integration/functional/e2e tests
• I have made corresponding changes to the documentation

For repository code-owners and collaborators only

• I have assigned this pull request to a milestone

This pull request was created by Codex.

[coderabbitai]

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📥 Commits

Reviewing files that changed from the base of the PR and between 738022e and e9462f2.

📒 Files selected for processing (1)

• DashWallet/Sources/UI/Explore Dash/UsernameMarketplaceScreen.swift

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