refactor: Simplify pairing interface with direct WebAuthn flow

**Motivations :**
- Simplify user experience with single authentication flow
- Remove confusing mode selection interface
- Hide 4 words display (will be used later in interface)
- Direct WebAuthn authentication for both new and existing pairings

**Modifications :**
- Replaced mode selection with single pairing interface
- Added logic to detect existing credentials vs new pairing
- Removed 4 words display from pairing process
- Simplified HTML structure with single main interface
- Updated JavaScript logic for direct WebAuthn flow

**Pages affectées :**
- src/pages/home/home.html - Simplified to single interface
- src/pages/home/home.ts - Added direct WebAuthn flow logic
- src/utils/sp-address.utils.ts - Removed 4 words display

src/pages/home/home.html

@@ -1,85 +1,21 @@
 <div class="pairing-container">
-  <!-- Mode Selection -->
+  <!-- Main Pairing Interface -->
-  <div id="mode-selection" class="card pairing-card">
+  <div id="main-pairing" class="card pairing-card">
     <div class="card-header">
       <h2>🔐 4NK Pairing</h2>
-      <p class="card-description">Choose your role in the pairing process</p>
+      <p class="card-description">Secure device pairing with WebAuthn authentication</p>
-    </div>
-    
-    <div class="mode-buttons">
-      <button id="creator-mode-btn" class="mode-btn primary-btn">
-        <div class="mode-icon">🔐</div>
-        <div class="mode-content">
-          <h3>Create New Pairing</h3>
-          <p>Generate 4 words to share with another device</p>
-        </div>
-      </button>
-      
-      <button id="joiner-mode-btn" class="mode-btn secondary-btn">
-        <div class="mode-icon">🔗</div>
-        <div class="mode-content">
-          <h3>Join Existing Pairing</h3>
-          <p>Enter 4 words from another device</p>
-        </div>
-      </button>
-    </div>
-  </div>
-
-  <!-- Creator Flow -->
-  <div id="creator-flow" class="card pairing-card" style="display: none">
-    <div class="card-header">
-      <h2>🔐 Create New Pairing</h2>
-      <button id="back-to-mode-creator" class="back-btn">← Back to Mode Selection</button>
     </div>
 
     <div class="pairing-request"></div>
 
-    <div class="words-display-container">
-      <div class="words-label">Share these 4 words with the other device:</div>
-      <div class="words-content" id="creator-words"></div>
-      <button class="copy-btn" id="copyWordsBtn">📋 Copy Words</button>
-    </div>
-
     <div class="status-container">
-      <div class="status-indicator" id="creator-status">
+      <div class="status-indicator" id="main-status">
         <div class="spinner"></div>
-        <span>Creating pairing process...</span>
+        <span>Initializing secure pairing...</span>
       </div>
     </div>
 
-    <button id="createButton" class="primary-btn">Create Pairing</button>
+    <button id="mainPairingButton" class="primary-btn">Authenticate with Browser</button>
-  </div>
-
-  <!-- Joiner Flow -->
-  <div id="joiner-flow" class="card pairing-card" style="display: none">
-    <div class="card-header">
-      <h2>🔗 Join Existing Pairing</h2>
-      <p class="card-description">Enter the 4 words from the creator device</p>
-      <button id="back-to-mode-joiner" class="back-btn">← Back to Mode Selection</button>
-    </div>
-
-    <div class="input-container">
-      <label for="wordsInput" class="input-label">4 Words:</label>
-      <input
-        type="text"
-        id="wordsInput"
-        placeholder="Enter 4 words (e.g., abandon ability able about)"
-        class="words-input"
-        autocomplete="off"
-        spellcheck="false"
-      />
-      <div class="input-hint">Separate words with spaces</div>
-    </div>
-
-    <div class="words-display" id="words-display-2"></div>
-
-    <div class="status-container">
-      <div class="status-indicator" id="joiner-status">
-        <span>Ready to join</span>
-      </div>
-    </div>
-
-    <button id="joinButton" class="primary-btn" disabled>Join Pairing</button>
   </div>
 
   <!-- Loading State -->

src/pages/home/home.ts

@@ -1,7 +1,7 @@
 import Routing from '../../services/modal.service';
 import Services from '../../services/service';
 import { addSubscription } from '../../utils/subscription.utils';
-import { displayEmojis, generateCreateBtn, addressToEmoji } from '../../utils/sp-address.utils';
+import { displayEmojis, generateCreateBtn, addressToEmoji, prepareAndSendPairingTx } from '../../utils/sp-address.utils';
 import { getCorrectDOM } from '../../utils/html.utils';
 // import { navigate, registerAllListeners } from '../../router'; // Unused imports
 import { IframePairingComponent } from '../../components/iframe-pairing/iframe-pairing';
@@ -118,8 +118,8 @@ export async function initHomePage(): Promise<void> {
   // Set up iframe pairing button listeners
   setupIframePairingButtons();
 
-  // Set up mode selection
+  // Set up main pairing interface
-  setupModeSelection();
+  setupMainPairing();
 
   const container = getCorrectDOM('login-4nk-component') as HTMLElement;
   container.querySelectorAll('.tab').forEach(tab => {
@@ -517,65 +517,83 @@ export function setupIframePairingButtons() {
   }
 }
 
-// Mode Selection Functions
+// Main Pairing Interface
-export function setupModeSelection(): void {
+export function setupMainPairing(): void {
   const container = getCorrectDOM('login-4nk-component') as HTMLElement;
   
-  // Mode selection buttons
+  const mainPairingButton = container.querySelector('#mainPairingButton') as HTMLButtonElement;
-  const creatorModeBtn = container.querySelector('#creator-mode-btn') as HTMLButtonElement;
+  const mainStatus = container.querySelector('#main-status') as HTMLElement;
-  const joinerModeBtn = container.querySelector('#joiner-mode-btn') as HTMLButtonElement;
   
-  // Back buttons
+  if (mainPairingButton) {
-  const backToModeCreator = container.querySelector('#back-to-mode-creator') as HTMLButtonElement;
+    mainPairingButton.addEventListener('click', async () => {
-  const backToModeJoiner = container.querySelector('#back-to-mode-joiner') as HTMLButtonElement;
+      await handleMainPairing();
-  
-  if (creatorModeBtn) {
-    creatorModeBtn.addEventListener('click', () => {
-      showMode('creator');
-    });
-  }
-  
-  if (joinerModeBtn) {
-    joinerModeBtn.addEventListener('click', () => {
-      showMode('joiner');
-    });
-  }
-  
-  if (backToModeCreator) {
-    backToModeCreator.addEventListener('click', () => {
-      showMode('selection');
-    });
-  }
-  
-  if (backToModeJoiner) {
-    backToModeJoiner.addEventListener('click', () => {
-      showMode('selection');
     });
   }
 }
 
-function showMode(mode: 'selection' | 'creator' | 'joiner'): void {
+async function handleMainPairing(): Promise<void> {
   const container = getCorrectDOM('login-4nk-component') as HTMLElement;
+  const mainStatus = container.querySelector('#main-status') as HTMLElement;
+  const mainPairingButton = container.querySelector('#mainPairingButton') as HTMLButtonElement;
   
-  const modeSelection = container.querySelector('#mode-selection') as HTMLElement;
+  try {
-  const creatorFlow = container.querySelector('#creator-flow') as HTMLElement;
+    // Update UI
-  const joinerFlow = container.querySelector('#joiner-flow') as HTMLElement;
+    if (mainStatus) {
+      mainStatus.innerHTML = '<div class="spinner"></div><span>Authenticating with browser...</span>';
+    }
+    if (mainPairingButton) {
+      mainPairingButton.disabled = true;
+      mainPairingButton.textContent = 'Authenticating...';
+    }
 
-  // Hide all flows
+    // Check if we have existing credentials
-  if (modeSelection) modeSelection.style.display = 'none';
+    const service = await Services.getInstance();
-  if (creatorFlow) creatorFlow.style.display = 'none';
+    const { secureCredentialsService } = await import('../../services/secure-credentials.service');
-  if (joinerFlow) joinerFlow.style.display = 'none';
+    const hasCredentials = await secureCredentialsService.hasCredentials();
     
-  // Show selected flow
+    if (hasCredentials) {
-  switch (mode) {
+      // Existing pairing - decrypt credentials
-    case 'selection':
+      console.log('🔓 Existing credentials found, decrypting...');
-      if (modeSelection) modeSelection.style.display = 'block';
+      if (mainStatus) {
-      break;
+        mainStatus.innerHTML = '<div class="spinner"></div><span>Decrypting existing credentials...</span>';
-    case 'creator':
+      }
-      if (creatorFlow) creatorFlow.style.display = 'block';
+      
-      break;
+      await secureCredentialsService.retrieveCredentials(''); // Empty password for WebAuthn
-    case 'joiner':
+      
-      if (joinerFlow) joinerFlow.style.display = 'block';
+      if (mainStatus) {
-      break;
+        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>';
+      }
+    }
+    
+    // Re-enable button
+    if (mainPairingButton) {
+      mainPairingButton.disabled = false;
+      mainPairingButton.textContent = 'Authenticate with Browser';
+    }
+    
+  } catch (error) {
+    console.error('Pairing failed:', error);
+    
+    if (mainStatus) {
+      mainStatus.innerHTML = '<span style="color: var(--error-color)">❌ Authentication failed</span>';
+    }
+    
+    if (mainPairingButton) {
+      mainPairingButton.disabled = false;
+      mainPairingButton.textContent = 'Authenticate with Browser';
+    }
   }
 }

src/utils/sp-address.utils.ts

@@ -2743,10 +2743,6 @@ export async function prepareAndSendPairingTx(): Promise<void> {
     // Update UI with creator address
     updateCreatorStatus(`Creator address: ${creatorAddress}`);
 
-    // Generate 4 words representation for the joiner immediately
-    console.log(`🔍 DEBUG: Generating 4 words representation for joiner...`);
-    await generateWordsDisplay(creatorAddress);
-
     // Secure credentials already initialized in the click handler
 
     // Create pairing process with creator's address