Phase 3: wire multi-account lifecycle into desktop AccountManager.
- Add DesktopAccountStorage field and allAccounts StateFlow
- switchAccount(): loads new account BEFORE cancelling old state
(prevents unrecoverable partial failure per coroutines review)
- addAccountToStorage / removeAccountFromStorage for CRUD
- loadViewOnlyAccount() for npub-only accounts
- migrateAndLoadAccounts() for legacy file migration on startup
- saveCurrentAccount / saveBunkerAccount now save to encrypted storage
- Updated test mock setup to support SecureKeyStorage key store
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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