Add XpubAnnounce and on_xpub_announced to UDL bindings

[kwsantiago]

Summary by CodeRabbit

• New Features
  • Added support for announcing multiple extended public keys with metadata, including fingerprints and optional labels, to the wallet.

[coderabbitai]

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📥 Commits

Reviewing files that changed from the base of the PR and between ba3f359 and 16c1165.

📒 Files selected for processing (2)

• keep-desktop/src/frost.rs
• keep-desktop/src/message.rs

Walkthrough

Extended public key (xpub) announcement support added to the mobile wallet interface. Introduces AnnouncedXpubInfo dictionary and corresponding wallet_announce_xpubs method alongside a descriptor callback hook for handling announced keys.

Changes

Cohort / File(s)	Summary
Mobile Interface Extensions keep-mobile/src/keep_mobile.udl	Added AnnouncedXpubInfo dictionary (xpub, fingerprint, optional label) and wallet_announce_xpubs method to KeepMobile interface. Introduced on_xpub_announced callback to DescriptorCallbacks for handling share index-based xpub announcements.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~10 minutes

Possibly related PRs

• Add XpubAnnounce message for recovery key pre-exchange (#269) #275: Implements XpubAnnounce/AnnouncedXpub functionality and corresponding UniFFI bindings that directly integrate with these interface declarations.
• Add descriptor coordination to keep-mobile UniFFI bindings (#187) #242: Extends DescriptorCallbacks and KeepMobile interfaces for descriptor coordination, providing context for xpub announcement callback and method integration.

Poem

🐰 Xpubs announced with grace,
Keys dancing through wallet space,
Callbacks whisper share by share,
Extended publics, free to share! ✨

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately and specifically describes the main changes: adding XpubAnnounce-related functionality (AnnouncedXpubInfo dictionary) and on_xpub_announced callback to UDL bindings.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch xpub-announce-udl

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