feat: homeserver mgmt

[pwltr]

Summary

Adds homeserver management to the Edit Pubky sheet.

The Edit Pubky flow now supports selecting an existing homeserver, adding a new homeserver, and editing saved homeservers inside the same sheet flow. The default Synonym homeserver is always available, cannot be deleted, and can only have its invite code edited.

Changes

• Refactored EditPubkySheet into routed sheet screens:
  • EditPubkyMain
  • EditPubkySelectServer
  • EditPubkyAddServer
  • EditPubkyEditServer
• Added reusable EditPubky flow state for selected homeserver and per-homeserver draft invite codes.
• Added reusable server form UI with invite code formatting, validation, success border, and checkmark.
• Added ServerCard and ServerCardSmall components for server selection and selected-server display.
• Added Redux homeserver state:
  • default Synonym homeserver
  • add/update/remove custom homeservers
  • selector that always includes the default homeserver
• Added migration to backfill older signed-up pubkys that used an empty homeserver to mean the default homeserver.
• Updated EditPubky submit logic:
  • skips signup when already signed up to the selected homeserver
  • only saves name changes when no homeserver auth is needed
  • keeps invite codes as transient EditPubky flow state instead of persisting them from this flow
  • handles invite-token signup errors without incorrectly falling back to signin
• Added translations for the new server screens and actions.
• Added tests for EditPubky submit behavior.

Simulator.Screen.Recording.-.iPhone.17.-.2026-08-03.at.18.05.30.mov

Testing

• yarn typecheck
• yarn test __tests__/editPubkyAction.test.ts
• yarn lint