Sentry SDK is loaded via dynamic import() only when a DSN is configured
and error reporting is enabled, keeping it out of the initial bundle.
Users can control error reporting via a toggle and DSN field in
Advanced Settings, with the DSN synced across devices via encrypted
NIP-78 settings. The ErrorBoundary now reports fatal crashes to Sentry
with component stack context, and a beforeSend hook censors nsec
private keys before any data leaves the browser.
Alex Gleason