Phase 1 of multi-account support. Move account types to commons/commonMain
so both Android and Desktop share the same data model:
- SignerType sealed class (Internal, Remote, ViewOnly)
- AccountInfo data class (npub, signerType, isTransient)
- AccountStorage interface (loadAccounts, saveAccount, etc.)
Desktop AccountManager now imports SignerType from commons instead of
defining its own. All existing tests updated with new import path.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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