fix: public payments polish

[ben-kaufman]

Fixes #931

Description

Polishes the public contact payment flows from PR #924:

• Routes Pubky keys entered manually through the same contact/profile resolution used by paste and scan.
• Pops the Add Contact screen before opening the payment flow, avoiding the background Add Contact screen glitch.
• Preserves contact metadata on RBF replacement transactions and filters replaced sent transactions from contact activity.
• Shares the replaced-sent-transaction predicate through the existing activity extension layer.

Preview

N/A

QA Notes

Validated with:

• ./gradlew testDevDebugUnitTest --tests "to.bitkit.repositories.ActivityRepoTest" --tests "to.bitkit.viewmodels.AppViewModelSendFlowTest"
• ./gradlew compileDevDebugKotlin
• ./gradlew testDevDebugUnitTest
• ./gradlew detekt

Suggested manual checks:

• Send -> Enter manually with a Pubky key routes to the expected contact/profile flow.
• Paying a contact from Add Contact opens the send flow without leaving Add Contact visible behind it.
• RBF a sent contact transaction and confirm contact activity shows the replacement transaction rather than the removed mempool transaction.

[piotr-iohk]

Tested. Seeing two out of three original issues:

• Send -> Enter manually with a Pubky key routes to the expected contact/profile flow. ❌
• Paying a contact from Add Contact opens the send flow without leaving Add Contact visible behind it. ❌

Screen.Recording.2026-05-06.at.09.04.59.mov

---

• RBF a sent contact transaction and confirm contact activity shows the replacement transaction rather than the removed mempool transaction. ✅

[piotr-iohk]

Still seeing two issues.

[chatgpt-codex-connector]

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