fix: Always trigger WebAuthn authentication

**Motivations :**
- Restore previous WebAuthn behavior that was lost in interface simplification
- Ensure WebAuthn is always triggered regardless of existing credentials
- Maintain consistent authentication flow

**Modifications :**
- Removed conditional logic that prevented WebAuthn from triggering
- Always call prepareAndSendPairingTx() which triggers WebAuthn
- Simplified authentication flow to always require user interaction

**Pages affectées :**
- src/pages/home/home.ts - Fixed WebAuthn triggering logic

src/pages/home/home.ts

@@ -549,36 +549,17 @@ async function handleMainPairing(): Promise<void> {
       mainPairingButton.textContent = 'Authenticating...';
     }
 
-    // Check if we have existing credentials
-    const service = await Services.getInstance();
-    const { secureCredentialsService } = await import('../../services/secure-credentials.service');
-    const hasCredentials = await secureCredentialsService.hasCredentials();
-
-    if (hasCredentials) {
-      // Existing pairing - decrypt credentials
-      console.log('🔓 Existing credentials found, decrypting...');
-      if (mainStatus) {
-        mainStatus.innerHTML = '<div class="spinner"></div><span>Decrypting existing credentials...</span>';
-      }
-
-      await secureCredentialsService.retrieveCredentials(''); // Empty password for WebAuthn
-
-      if (mainStatus) {
-        mainStatus.innerHTML = '<span style="color: var(--success-color)">✅ Credentials decrypted successfully</span>';
-      }
-    } else {
-      // No existing pairing - create new one
-      console.log('🔐 No existing credentials, creating new pairing...');
-      if (mainStatus) {
-        mainStatus.innerHTML = '<div class="spinner"></div><span>Creating new secure pairing...</span>';
-      }
-
-      // This will trigger the WebAuthn flow and create new credentials
-      await prepareAndSendPairingTx();
-
-      if (mainStatus) {
-        mainStatus.innerHTML = '<span style="color: var(--success-color)">✅ New pairing created successfully</span>';
-      }
+    // Always trigger WebAuthn flow for authentication
+    console.log('🔐 Triggering WebAuthn authentication...');
+    if (mainStatus) {
+      mainStatus.innerHTML = '<div class="spinner"></div><span>Authenticating with browser...</span>';
+    }
+    
+    // This will trigger the WebAuthn flow and create/decrypt credentials
+    await prepareAndSendPairingTx();
+    
+    if (mainStatus) {
+      mainStatus.innerHTML = '<span style="color: var(--success-color)">✅ Authentication completed successfully</span>';
     }
 
     // Re-enable button

src/services/service.ts

@@ -890,12 +890,12 @@ export default class Services {
     // console.log('relayAddress:', relayAddress, 'feeRate:', feeRate);
 
     await this.getTokensFromFaucet();
-    
+
     const members = this.getAllMembers();
     console.log('🔍 DEBUG: Members for create_new_process:', members);
     console.log('🔍 DEBUG: Members type:', typeof members);
     console.log('🔍 DEBUG: Members keys:', Object.keys(members));
-    
+
     const result = this.sdkClient.create_new_process(
       encodedPrivateData,
       roles,