Feat: add profile fetching from pubky

[ben-kaufman]

Summary

Integrates Pubky decentralized identity into Bitkit, allowing users to connect their Pubky profile via Pubky Ring authentication. Once connected, the user's profile name and avatar are displayed on the home screen header, and a full profile page shows their bio, links, and a shareable QR code.

What's included

• Authentication flow via Pubky Ring deep links (pubkyauth://) with relay-based session exchange, session persistence in Keychain, and automatic restoration on app launch
• Profile page displaying name, bio, links, and a QR code with the profile picture overlaid
• Home screen integration showing the authenticated user's name and avatar in the header
• PubkyService — service layer wrapping paykit-ffi (profile/contacts/payments) and bitkit-core (auth relay, PKDNS file fetching)
• PubkyProfileManager — manages auth state, session lifecycle, and profile data with all FFI/Keychain/disk operations offloaded to background threads
• PubkyImage component for loading pubky:// URIs with two-tier (memory + disk) caching
• Suggestion card auto-dismiss when user is already authenticated
• QR component — moved QR code generation off the main thread

New dependencies

• paykit-rs (SPM, branch: master) — Pubky SDK for profile, contacts, and payment operations
• CoreBluetooth framework (linker flag, required by paykit-rs)

New files

File	Purpose
Services/PubkyService.swift	FFI bridge to paykit-ffi and bitkit-core
Managers/PubkyProfileManager.swift	Auth state, session persistence, profile loading
Models/PubkyProfile.swift	Profile data model
Components/PubkyImage.swift	pubky:// image loader with disk+memory cache
Views/Profile/ProfileView.swift	Full profile page (name, bio, links, QR)
Views/Profile/PubkyRingAuthView.swift	Pubky Ring auth flow UI

Modified files

File	Change
AppScene.swift	Inject PubkyProfileManager, initialize Paykit early
MainNavView.swift	Wire up profile/auth navigation routes
Header.swift	Show profile name + avatar, navigate to profile
Suggestions.swift	Auto-dismiss profile card when authenticated
QR.swift	Async QR generation via .task(id:)
Info.plist	LSApplicationQueriesSchemes for pubkyauth, ATS config
Keychain.swift	Add paykitSession entry type
NavigationViewModel.swift	Add .pubkyRingAuth route
ProfileIntro.swift	Updated layout and styling
Colors.swift	Add pubkyBrand color
Localizable.strings	Profile-related translation keys

Test plan

• Fresh install: tap profile in header → shows intro → continue → auth screen
• Auth screen: shows "Download Pubky Ring" if Ring not installed, "Authorize" if installed
• Authorize → opens Pubky Ring → approve → returns to Bitkit → navigates to profile page
• Profile page shows name, bio, links, QR code with profile picture overlay
• Home header shows profile name and avatar after authentication
• Kill and relaunch app → session restored, profile shown without re-auth
• Sign out from profile page → returns to unauthenticated state
• Profile suggestion card auto-dismisses when authenticated

ScreenRecording_03-04-2026.23-49-21_1.MP4