Render a dedicated page for deactivated Bluesky accounts
Catch the AppView's AccountDeactivated XRPC error in AtprotoClient.getProfile
and surface it as a typed AccountDeactivatedError, so the profile controller
can render a styled 410 page instead of bubbling the raw error message up
through the default exception handler.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>