feat: migrate secret management to datastore proto and tink

app/src/main/java/com/bitcointxoko/gudariwallet/MainActivity.kt

@@ -3,7 +3,6 @@ package com.bitcointxoko.gudariwallet
 import android.Manifest
 import android.content.ActivityNotFoundException
 import android.content.Intent
-import android.net.Uri
 import android.os.Build
 import android.os.Bundle
 import android.os.PowerManager
@@ -17,6 +16,9 @@ import androidx.appcompat.app.AppCompatActivity
 import androidx.compose.runtime.*
 import androidx.core.content.edit
 import androidx.core.net.toUri
+import androidx.lifecycle.lifecycleScope
+import kotlinx.coroutines.flow.SharingStarted
+import kotlinx.coroutines.flow.stateIn
 import com.bitcointxoko.gudariwallet.security.EncryptedSecretStore
 import com.bitcointxoko.gudariwallet.service.WalletNotificationService
 import com.bitcointxoko.gudariwallet.ui.OnboardingScreen
@@ -27,6 +29,8 @@ import com.bitcointxoko.gudariwallet.ui.theme.GudariWalletTheme
 import com.bitcointxoko.gudariwallet.util.NotificationHelper
 import com.bitcointxoko.gudariwallet.util.IntentUtils
 import kotlinx.coroutines.flow.MutableSharedFlow
+import androidx.compose.runtime.collectAsState
+import androidx.compose.runtime.getValue
 
 class MainActivity : AppCompatActivity() {
 
@@ -57,8 +61,13 @@ class MainActivity : AppCompatActivity() {
 
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
-
         secretStore = EncryptedSecretStore(applicationContext)
+        val credentialsState = secretStore.credentials
+            .stateIn(
+                scope = lifecycleScope,
+                started = SharingStarted.WhileSubscribed(5_000),
+                initialValue = null
+            )
 
         // Must be first — before any notification is posted
         NotificationHelper.createChannels(applicationContext)
@@ -72,7 +81,10 @@ class MainActivity : AppCompatActivity() {
 
         setContent {
             GudariWalletTheme {
-                var isOnboarded by remember { mutableStateOf(secretStore.isOnboarded) }
+                val credentials by credentialsState.collectAsState()
+
+                // Treat null (loading) the same as not-onboarded to avoid a flash
+                val isOnboarded = credentials?.isOnboarded == true
 
                 if (isOnboarded) {
                     LaunchedEffect(Unit) {
@@ -80,20 +92,20 @@ class MainActivity : AppCompatActivity() {
                         requestNotificationPermissionIfNeeded()
                         promptBatteryOptimizationIfNeeded()
                     }
-                    // Pass pendingPaymentHash so WalletScreen can consume it
                     WalletScreen(
-                        vm                  = vm,
-                        pendingPaymentHash  = pendingPaymentHash,
+                        vm                 = vm,
+                        pendingPaymentHash = pendingPaymentHash,
                         pendingPaymentUri  = pendingPaymentUri
                     )
                 } else {
                     OnboardingScreen(
                         secretStore = secretStore,
-                        onComplete  = { isOnboarded = true }
+                        onComplete  = { /* no-op: Flow update triggers recomposition automatically */ }
                     )
                 }
             }
         }
+
     }
 
     // Called when the activity is already running and a notification is tapped