Three fixes:
1. Display names now stored in AccountInfo/AccountInfoDto and persisted
in encrypted storage. Populated when metadata arrives from relays via
metadataVersion LaunchedEffect. Available immediately on next open.
2. loadInternalAccount falls back to loadReadOnlyAccount when no private
key found in SecureKeyStorage — fixes npub-only accounts that were
saved as SignerType.Internal from earlier sessions.
3. Dropdown uses persisted displayName first, cache lookup as fallback.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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