fix: implement proper WebAuthn user interaction and fix WebAssembly serialization

**Motivations :**
- WebAuthn requires user gesture (click) to work properly
- Fix WebAssembly serialization error 'invalid type: sequence, expected a map'
- Provide clear UI for user to trigger WebAuthn authentication
- Ensure proper error handling for authentication failures

**Modifications :**
- Added authentication button in home.ts that requires user click for WebAuthn
- Fixed WebAssembly members parameter to pass object map instead of array
- Added CSS styles for authentication button with hover effects
- Improved error handling and user feedback for authentication process
- Maintained user interaction requirement for WebAuthn security

**Pages affectées :**
- src/pages/home/home.ts: Added user interaction button for WebAuthn
- src/services/service.ts: Fixed WebAssembly serialization to use object map
- src/4nk.css: Added authentication button styles with responsive design

src/4nk.css

@@ -1230,6 +1230,45 @@ select[data-multi-select-plugin] {
   box-shadow: 0 2px 8px rgba(220, 53, 69, 0.3);
 }
 
+/* Authentication Button Styles */
+.auth-container {
+  text-align: center;
+  padding: 20px;
+}
+
+.auth-button {
+  background: linear-gradient(135deg, #007bff, #0056b3);
+  color: white;
+  border: none;
+  padding: 16px 32px;
+  border-radius: 12px;
+  cursor: pointer;
+  font-size: 16px;
+  font-weight: 600;
+  transition: all 0.3s ease;
+  box-shadow: 0 4px 15px rgba(0, 123, 255, 0.3);
+  margin: 20px 0;
+  min-width: 250px;
+}
+
+.auth-button:hover {
+  background: linear-gradient(135deg, #0056b3, #004085);
+  transform: translateY(-2px);
+  box-shadow: 0 6px 20px rgba(0, 123, 255, 0.4);
+}
+
+.auth-button:active {
+  transform: translateY(0);
+  box-shadow: 0 4px 15px rgba(0, 123, 255, 0.3);
+}
+
+.auth-hint {
+  color: #6c757d;
+  font-size: 14px;
+  margin-top: 10px;
+  font-style: italic;
+}
+
 /* Responsive Design for Mode Selection */
 @media (max-width: 768px) {
   .mode-buttons {
@@ -1244,4 +1283,10 @@ select[data-multi-select-plugin] {
     position: static;
     margin-top: 10px;
   }
+
+  .auth-button {
+    min-width: 200px;
+    padding: 14px 28px;
+    font-size: 14px;
+  }
 }

src/pages/home/home.ts

@@ -547,13 +547,28 @@ async function handleMainPairing(): Promise<void> {
   const mainStatus = container.querySelector('#main-status') as HTMLElement;
 
   try {
-    // Update UI
+    // Show authentication button that requires user interaction
     if (mainStatus) {
-      mainStatus.innerHTML = '<div class="spinner"></div><span>Authenticating with browser...</span>';
+      mainStatus.innerHTML = `
+        <div class="auth-container">
+          <p>🔐 Secure authentication required</p>
+          <button id="authButton" class="auth-button">🔐 Authenticate with Browser</button>
+          <p class="auth-hint">Click the button above to authenticate with your browser</p>
+        </div>
+      `;
     }
 
-    // Always trigger WebAuthn flow for authentication
+    // Wait for user to click the authentication button
-    console.log('🔐 Triggering WebAuthn authentication...');
+    await new Promise<void>((resolve, reject) => {
+      const authButton = document.getElementById('authButton') as HTMLButtonElement;
+      if (!authButton) {
+        reject(new Error('Authentication button not found'));
+        return;
+      }
+
+      authButton.addEventListener('click', async () => {
+        try {
+          // Update UI to show authentication in progress
           if (mainStatus) {
             mainStatus.innerHTML = '<div class="spinner"></div><span>Authenticating with browser...</span>';
           }
@@ -592,6 +607,16 @@ async function handleMainPairing(): Promise<void> {
 
           // Now proceed with pairing process
           await prepareAndSendPairingTx();
+          resolve();
+        } catch (error) {
+          console.error('Authentication failed:', error);
+          if (mainStatus) {
+            mainStatus.innerHTML = '<span style="color: var(--error-color)">❌ Authentication failed. Please try again.</span>';
+          }
+          reject(error);
+        }
+      });
+    });
 
   } catch (error) {
     console.error('Pairing failed:', error);

src/services/service.ts

@@ -903,12 +903,13 @@ export default class Services {
       throw new Error('No members available - handshake not completed yet');
     }
 
-    // Convert to simple array of SP addresses for WebAssembly
+    // Convert to map format for WebAssembly (keep original structure)
-    const members = Object.values(membersObj).map(member => ({
+    const members = membersObj;
-      sp_addresses: member.sp_addresses
+    console.log('🔍 DEBUG: Members map keys:', Object.keys(members));
-    }));
+    console.log('🔍 DEBUG: Members map sample:', Object.keys(members).slice(0, 3).reduce((acc, key) => {
-    console.log('🔍 DEBUG: Members array length:', members.length);
+      acc[key] = members[key];
-    console.log('🔍 DEBUG: Members simplified:', members);
+      return acc;
+    }, {} as any));
 
     const result = this.sdkClient.create_new_process(
       encodedPrivateData,