Adds client-initiated NIP-46 (nostrconnect://) flow so users can pair
with a remote signer (e.g. Amber) by scanning a QR code instead of
manually copying a bunker:// URI.
Changes:
- Fix RemoteSignerManager to decrypt NIP-44 content before parsing
- Add CoroutineScope to NostrSignerRemote for async event callbacks
- Add loginWithNostrConnect() to AccountManager with 120s timeout
- Add QrCodeCanvas composable using ZXing for QR generation
- Add "Connect" tab to LoginCard showing QR + copyable URI + waiting state
- Wire nostrconnect flow through LoginScreen
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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