fix: relay reconnection, stale subscriptions, and UAT testnet switch

[dangershony]

Problem

Three related issues causing UAT test failures:

1. Relay messages lost on refresh

When a Nostr relay disconnects, the app never reconnects (ReconnectTimeout was null). Subsequent refresh calls send REQ messages to dead WebSocket connections that silently fail. Additionally, repeated refresh calls hit stale subscription state:

• MonitoringEoseReceivedOnSubscription used TryAdd which returned false on repeat calls, keeping stale relay tracking sets
• TryAddEoseAction used TryAdd which lost the new callback, so EOSE responses triggered the old (already-returned) callback
• Event stream handlers captured closures from previous calls, routing events to stale message lists

This caused investor processes to never see founder approval signatures until restart.

2. Automation server thread safety

• ConfirmNetworkSwitchAsync accessed UI-bound properties from a background thread (crash)
• ConfirmWipeData is async void, the wipe endpoint returned before wallets were actually cleared
• SeedGroups read before pending RebuildSeedGroups UI jobs had flushed

3. UAT tests assume Angornet

Default network changed to Mainnet. After WipeDataAsync, the persisted network resets to Mainnet. Tests that create wallets without switching to Angornet first hit the mainnet indexer and fail silently.

Fixes

Relay layer (Angor.Shared)

• NostrCommunicationFactory: Set ReconnectTimeout to 30s so dead relays auto-reconnect
• NostrCommunicationFactory: MonitoringEoseReceivedOnSubscription now replaces stale relay tracking sets
• RelaySubscriptionsHandling: TryAddEoseAction now replaces the callback on repeat calls
• RelaySubscriptionsHandling: Added DisposeLocalSubscription, tears down local event handler without sending Nostr CLOSE
• SignService: LookupAllInvestmentMessagesAsync disposes and recreates event handlers on each call

Automation layer (App)

• AutomationServer: Dispatch ConfirmNetworkSwitchAsync to UI thread
• AutomationServer: Poll-wait for WalletContext.Wallets to clear after wipe
• AutomationFlows: Flush UI jobs before reading SeedGroups after wallet creation

UAT tests

• Added SwitchNetworkAsync Angornet after every wipe call across all 7 test files

Test Results

Test	Before	After
CreateProjectTest	Pass	Pass
MultiFundClaimAndRecoverTest	Hung	Pass (7 min)
SendFundsTest	Failed	Pass (6 min)
WalletRecoveryTest	Hung	Pass (49s)
WipeDataRecoveryTest	Failed	Pass (63s)
MultiInvestClaimAndRecoverTest	Hung	Progresses fully, transient indexer lag at claim step