feat: Supprimer le fallback et forcer WebAuthn

- Supprimer toutes les vérifications de contexte et fallback
- Forcer l'appel direct à navigator.credentials.create()
- Simplifier le code pour identifier le problème WebAuthn
- Tester si WebAuthn fonctionne sans conditions

src/services/secure-credentials.service.ts

@@ -104,55 +104,39 @@ export class SecureCredentialsService {
       const encryptedSpendKey = await this.encryptKey(credentialData.spendKey, masterKey);
       const encryptedScanKey = await this.encryptKey(credentialData.scanKey, masterKey);
 
-      // Vérifier si WebAuthn est disponible et si on est en HTTPS
-      const isSecureContext = window.isSecureContext;
-      const hasWebAuthn = navigator.credentials && navigator.credentials.create;
+      // Forcer l'utilisation de WebAuthn (pas de fallback)
+      console.log('🔍 DEBUG: Forcing WebAuthn credential creation');
+      secureLogger.info('Forcing WebAuthn credential creation', {
+        component: 'SecureCredentialsService',
+        operation: 'webauthn_force'
+      });
       
-      let credential = null;
-      
-      if (isSecureContext && hasWebAuthn) {
-        // Stocker dans les credentials du navigateur (HTTPS requis)
-        try {
-          credential = await navigator.credentials.create({
-            publicKey: {
-              challenge: new Uint8Array(32),
-              rp: { name: '4NK Secure Storage' },
-              user: {
-                id: new TextEncoder().encode('4nk-user'),
-                name: '4NK User',
-                displayName: '4NK User'
-              },
-              pubKeyCredParams: [
-                { type: 'public-key', alg: -7 }, // ES256
-                { type: 'public-key', alg: -257 } // RS256
-              ],
-              authenticatorSelection: {
-                authenticatorAttachment: 'platform',
-                userVerification: 'required'
-              },
-              timeout: 60000,
-              attestation: 'direct'
-            }
-          });
-          
-          secureLogger.info('WebAuthn credential created successfully', {
-            component: 'SecureCredentialsService',
-            operation: 'webauthn_create'
-          });
-        } catch (error) {
-          secureLogger.warn('WebAuthn credential creation failed, using fallback', error as Error, {
-            component: 'SecureCredentialsService',
-            operation: 'webauthn_create'
-          });
+      const credential = await navigator.credentials.create({
+        publicKey: {
+          challenge: new Uint8Array(32),
+          rp: { name: '4NK Secure Storage' },
+          user: {
+            id: new TextEncoder().encode('4nk-user'),
+            name: '4NK User',
+            displayName: '4NK User'
+          },
+          pubKeyCredParams: [
+            { type: 'public-key', alg: -7 }, // ES256
+            { type: 'public-key', alg: -257 } // RS256
+          ],
+          authenticatorSelection: {
+            authenticatorAttachment: 'platform',
+            userVerification: 'required'
+          },
+          timeout: 60000,
+          attestation: 'direct'
         }
-      } else {
-        secureLogger.info('WebAuthn not available (HTTP context), using fallback storage', {
-          component: 'SecureCredentialsService',
-          operation: 'webauthn_fallback',
-          isSecureContext,
-          hasWebAuthn
-        });
-      }
+      });
+      
+      secureLogger.info('WebAuthn credential created successfully', {
+        component: 'SecureCredentialsService',
+        operation: 'webauthn_create'
+      });
 
       if (credential) {
         // Stocker les données chiffrées dans IndexedDB

src/utils/sp-address.utils.ts

@@ -2533,6 +2533,26 @@ async function onCreateButtonClick() {
       console.log(`🔍 Creator flow detected`);
       updateCreatorStatus('Creating pairing process...');
 
+      // Initialize WebAuthn credentials immediately on user click
+      try {
+        console.log('🔍 DEBUG: Testing WebAuthn availability...');
+        console.log('🔍 DEBUG: isSecureContext:', window.isSecureContext);
+        console.log('🔍 DEBUG: hasCredentials:', !!navigator.credentials);
+        console.log('🔍 DEBUG: hasCreate:', !!navigator.credentials?.create);
+        console.log('🔍 DEBUG: protocol:', window.location.protocol);
+        
+        const { secureCredentialsService } = await import('../services/secure-credentials.service');
+        updateCreatorStatus('🔐 Requesting browser authentication...');
+        
+        // This should trigger the browser popup immediately
+        const credentials = await secureCredentialsService.generateSecureCredentials('4nk-pairing-password');
+        console.log('✅ WebAuthn credentials obtained');
+        updateCreatorStatus('✅ Browser authentication successful');
+      } catch (error) {
+        console.warn('⚠️ WebAuthn failed, continuing with fallback:', error);
+        updateCreatorStatus('⚠️ Using fallback authentication');
+      }
+
       await prepareAndSendPairingTx();
       updateCreatorStatus('Pairing process created! Generating 4 words...');
 
@@ -2700,30 +2720,7 @@ export async function prepareAndSendPairingTx(): Promise<void> {
     // Update UI with creator address
     updateCreatorStatus(`Creator address: ${creatorAddress}`);
 
-    // Initialize secure credentials with PBKDF2 and browser credentials
-    try {
-      const { secureCredentialsService } = await import('../services/secure-credentials.service');
-      
-      // Check if we're in a secure context (HTTPS)
-      if (window.isSecureContext) {
-        updateCreatorStatus('🔐 Initializing secure credentials with browser...');
-      } else {
-        updateCreatorStatus('🔐 Initializing secure credentials (HTTP mode - WebAuthn not available)...');
-      }
-      
-      // This will trigger the browser popup for WebAuthn (only in HTTPS)
-      const credentials = await secureCredentialsService.generateSecureCredentials('4nk-pairing-password');
-      console.log('✅ Secure credentials initialized with PBKDF2 and WebAuthn');
-      
-      if (window.isSecureContext) {
-        updateCreatorStatus('✅ Secure credentials ready (WebAuthn enabled)');
-      } else {
-        updateCreatorStatus('✅ Secure credentials ready (fallback mode - use HTTPS for WebAuthn)');
-      }
-    } catch (error) {
-      console.warn('⚠️ Secure credentials initialization failed:', error);
-      updateCreatorStatus('⚠️ Using fallback credentials');
-    }
+    // Secure credentials already initialized in the click handler
 
     // Create pairing process with creator's address
     const createPairingProcessReturn = await service.createPairingProcess(