Account switcher dropdown improvements:
- Two-row display: Display Name on top, npub (middle-truncated) below
e.g. 'Alice' / 'npub1abc...wxyz · Bunker'
- Middle-truncation for npub: shows first 10 + last 6 chars
- Resolves display names from DesktopLocalCache user metadata
- Confirmation dialog also shows display name
- npub-only (view-only) accounts now persist to encrypted storage
(ensureCurrentAccountInStorage called in onLoginSuccess)
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
nrobi144