Smart Reconnect Policy for Nostr

[AkarshSahlot]

the current Nostr connection logic may be fragile when network connectivity is intermittent or lost. A robust application needs a smart reconnection policy to maintain availability.

Proposed Changes:

Implement an exponential backoff strategy for reconnections in NostrService.
Detect network status changes and trigger reconnection attempts.
Ensure pending messages are queued or handled gracefully during disconnection.