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- AddAccountDialog: DialogWindow (480×600) wrapping existing LoginCard with back button, "Import Account" title. Supports nsec, npub, bunker, nostrconnect. New account becomes active immediately after login. - Per-account logout: ✕ button on each account row in dropdown, with AlertDialog confirmation before removal. - Wired both into DeckSidebar and Main.kt. Matches Android's AddAccountDialog pattern (full-screen dialog with LoginOrSignupScreen) adapted for desktop (DialogWindow). Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>