fix: biometric auth, workflow error propagation, execution logs

- Biometric: persist preference to SecureStore so it survives restarts;
  actually call LocalAuthentication.authenticateAsync() at startup and
  block navigation behind a locked screen until the user authenticates
- Workflow run: remove silent error swallowing in triggerWorkflow so
  failures surface as toasts; success snackbar only shown on API success
- Execution logs: add includeData=true to fetchExecutionById so n8n
  returns node-level data and error messages instead of an empty object

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

app/_layout.tsx

@@ -1,9 +1,10 @@
 import React, { useEffect, useState } from 'react';
 import { View } from 'react-native';
 import { Stack, useRouter, useSegments } from 'expo-router';
-import { PaperProvider, MD3DarkTheme, ActivityIndicator, Snackbar } from 'react-native-paper';
+import { PaperProvider, MD3DarkTheme, ActivityIndicator, Snackbar, Button, Text } from 'react-native-paper';
 import { SafeAreaProvider } from 'react-native-safe-area-context';
 import { GestureHandlerRootView } from 'react-native-gesture-handler';
+import * as LocalAuthentication from 'expo-local-authentication';
 import { useAppStore } from '../src/store/appStore';
 import { registerToastCallback } from '../src/utils/errorHandler';
 
@@ -36,7 +37,7 @@ const APP_THEME = {
 export default function RootLayout() {
   const router = useRouter();
   const segments = useSegments();
-  const { config, loadConfig } = useAppStore();
+  const { config, preferences, isAuthenticated, loadConfig, setAuthenticated } = useAppStore();
   const [isReady, setIsReady] = useState(false);
   const [toastMessage, setToastMessage] = useState('');
   const [toastVisible, setToastVisible] = useState(false);
@@ -52,25 +53,44 @@ export default function RootLayout() {
     });
   }, []);
 
-  /** Charge la configuration depuis le secure store puis marque l'app comme prête */
+  const runBiometricAuth = async (): Promise<boolean> => {
+    const result = await LocalAuthentication.authenticateAsync({
+      promptMessage: 'Authentifiez-vous pour accéder à n8n Pilot',
+      cancelLabel: 'Annuler',
+    });
+    return result.success;
+  };
+
   useEffect(() => {
-    loadConfig().finally(() => setIsReady(true));
+    const init = async () => {
+      await loadConfig();
+      const { preferences: prefs } = useAppStore.getState();
+      if (prefs.biometricEnabled) {
+        const success = await runBiometricAuth();
+        setAuthenticated(success);
+      } else {
+        setAuthenticated(true);
+      }
+      setIsReady(true);
+    };
+    init();
   }, []);
 
-  /**
-   * Gère la redirection initiale selon l'état de configuration.
-   * - Pas configuré et hors /setup → redirige vers /setup
-   * - Configuré et dans /setup → redirige vers les tabs
-   */
+  const handleUnlock = async (): Promise<void> => {
+    const success = await runBiometricAuth();
+    if (success) setAuthenticated(true);
+  };
+
   useEffect(() => {
     if (!isReady) return;
+    if (preferences.biometricEnabled && !isAuthenticated) return;
     const inSetup = segments[0] === 'setup';
     if (!config.isConfigured && !inSetup) {
       router.replace('/setup');
     } else if (config.isConfigured && inSetup) {
       router.replace('/(tabs)');
     }
-  }, [isReady, config.isConfigured, segments]);
+  }, [isReady, config.isConfigured, isAuthenticated, preferences.biometricEnabled, segments]);
 
   if (!isReady) {
     return (
@@ -80,6 +100,28 @@ export default function RootLayout() {
     );
   }
 
+  if (preferences.biometricEnabled && !isAuthenticated) {
+    return (
+      <GestureHandlerRootView style={{ flex: 1 }}>
+        <SafeAreaProvider>
+          <PaperProvider theme={APP_THEME}>
+            <View style={{ flex: 1, alignItems: 'center', justifyContent: 'center', backgroundColor: '#121212', paddingHorizontal: 32 }}>
+              <Text variant="headlineMedium" style={{ color: '#FF6D3E', marginBottom: 12 }}>
+                n8n Pilot
+              </Text>
+              <Text variant="bodyMedium" style={{ color: '#FFFFFF', marginBottom: 32, textAlign: 'center' }}>
+                Authentification biométrique requise
+              </Text>
+              <Button mode="contained" onPress={handleUnlock} icon="fingerprint">
+                Déverrouiller
+              </Button>
+            </View>
+          </PaperProvider>
+        </SafeAreaProvider>
+      </GestureHandlerRootView>
+    );
+  }
+
   return (
     <GestureHandlerRootView style={{ flex: 1 }}>
       <SafeAreaProvider>