Start built-in Tor when BUILTIN mode is selected at login/signup

When the first account is created with TorMode.BUILTIN selected,
call TorManager.start() immediately after saving settings so Tor
begins connecting before the app navigates to the main screen.
This mirrors the same call made in the Settings screen handler.

https://claude.ai/code/session_01CBvmaELoVYbgJi4Wi8fgrG

app/src/main/java/com/greenart7c3/nostrsigner/ui/AccountStateViewModel.kt

@@ -7,6 +7,7 @@ import com.greenart7c3.nostrsigner.Amber
 import com.greenart7c3.nostrsigner.LocalPreferences
 import com.greenart7c3.nostrsigner.models.Account
 import com.greenart7c3.nostrsigner.models.TorMode
+import com.greenart7c3.nostrsigner.service.TorManager
 import com.vitorpamplona.quartz.nip01Core.core.toHexKey
 import com.vitorpamplona.quartz.nip01Core.crypto.KeyPair
 import com.vitorpamplona.quartz.nip01Core.signers.NostrSignerInternal
@@ -118,6 +119,9 @@ class AccountStateViewModel(npub: String?) : ViewModel() {
             LocalPreferences.saveSettingsToEncryptedStorage(
                 Amber.instance.settings,
             )
+            if (torMode == TorMode.BUILTIN) {
+                TorManager.start(Amber.instance, Amber.instance.applicationIOScope)
+            }
         }
         LocalPreferences.updatePrefsForLogin(Amber.instance, account, keyPair.pubKey.toHexKey(), keyPair.privKey!!.toHexKey(), null)
         startUI(account, route)
@@ -152,6 +156,9 @@ class AccountStateViewModel(npub: String?) : ViewModel() {
             LocalPreferences.saveSettingsToEncryptedStorage(
                 Amber.instance.settings,
             )
+            if (torMode == TorMode.BUILTIN) {
+                TorManager.start(Amber.instance, Amber.instance.applicationIOScope)
+            }
             Amber.instance.applicationIOScope.launch {
                 Amber.instance.reconnect()
             }