fix: republish NIP-78 AppSpecificDataEvent when sendKind0EventsToLocalRelay changes

Add Account.updateSendKind0EventsToLocalRelay() suspend fun that calls
sendNewAppSpecificData() after updating the setting, matching the pattern
used by updateFilterSpam/updateWarnReports. Update AccountViewModel to
call this via launchSigner instead of directly mutating settings.

https://claude.ai/code/session_01Er9VV7nHyDb5pihrunb81F

amethyst/src/main/java/com/vitorpamplona/amethyst/model/Account.kt

@@ -436,6 +436,14 @@ class Account(
         return false
     }
 
+    suspend fun updateSendKind0EventsToLocalRelay(send: Boolean): Boolean {
+        if (settings.changeSendKind0EventsToLocalRelay(send)) {
+            sendNewAppSpecificData()
+            return true
+        }
+        return false
+    }
+
     suspend fun updateFilterSpam(filterSpam: Boolean): Boolean {
         if (settings.updateFilterSpam(filterSpam)) {
             if (!settings.syncedSettings.security.filterSpamFromStrangers.value) {

amethyst/src/main/java/com/vitorpamplona/amethyst/ui/screen/loggedIn/AccountViewModel.kt

@@ -1144,9 +1144,7 @@ class AccountViewModel(
 
     fun filterSpamFromStrangers() = account.settings.syncedSettings.security.filterSpamFromStrangers
 
-    fun toggleSendKind0ToLocalRelay(enabled: Boolean) {
-        account.settings.changeSendKind0EventsToLocalRelay(enabled)
-    }
+    fun toggleSendKind0ToLocalRelay(enabled: Boolean) = launchSigner { account.updateSendKind0EventsToLocalRelay(enabled) }
 
     fun updateWarnReports(warnReports: Boolean) = launchSigner { account.updateWarnReports(warnReports) }