feat(ui): main-identity selection and a pushed identity detail page

[QuantumExplorer]

Summary

Two changes to the Identities screen (More → Identities):

Pushed detail page

Tapping an identity now pushes a full page (same pattern as Wallets → accounts) instead of the compact modal sheet. Same content — copyable id card, info card, owned usernames — plus the new main-identity control, with room to grow.

Set your main identity

The SDK deliberately leaves primary-identity selection to the app layer (InMemoryWalletSummary.primaryIdentityId is always nil Rust-side, "source the user's pick from app state"). So:

• The pick is stored app-side, per wallet (UserDefaults, DWMainIdentityId.<walletIdHex>).
• DWCurrentUserIdentityInfo resolves the current identity as stored pick → identity index 0 → lowest registered index. The new last fallback also fixes a latent gap: a wallet whose only identity was discovered at a higher slot used to read as unregistered.
• Setting main runs the registration-completion cascade so everything re-keys live: identity snapshot, the DWGlobalOptions username mirror (re-pointed at the new main's name, or cleared — the Join banner then honestly returns), the registration-status notification chain, and the contacts snapshots.
• Scoped to the active wallet (DashPay surfaces follow it); identities of other wallets get an explanatory line instead of the button. Confirmation alert states the consequence ("Your username, profile, and contacts will follow this identity").
• The resolved main is badged with a seal on the list row and the page header — read from the same resolution every DashPay surface uses, so the badge can't disagree with behavior.

Test plan

• Clean dashpay simulator build (arm64); installed on QA-iPhone16
• Tap identity → detail page pushes (no sheet); back chevron pops
• Single-identity wallet: row and page show the Main seal (index-0 fallback)
• With a second identity (e.g. via Find on a multi-slot seed): Set as Main → confirm → home avatar/username and Contacts owner follow the pick; survives relaunch

🤖 Generated with Claude Code

[coderabbitai]

Caution

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feat/main-identity-detail-page

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