Update error message to indicate waiting for user validation

**Motivations :**
- User wants clearer message when authentication is pending
- Instead of 'Authentication failed', indicate that we're waiting for user validation

**Modifications :**
- Changed error message from '❌ Authentication failed' to '⏳ Waiting for user to validate secure key access...'
- Changed color from error-color to info-color to be less alarming
- Message is now in English as requested

**Pages affectées :**
- src/pages/home/home.ts

src/pages/home/home.ts

@@ -585,7 +585,7 @@ async function handleMainPairing(): Promise<void> {
     console.error('Pairing failed:', error);
     
     if (mainStatus) {
-      mainStatus.innerHTML = '<span style="color: var(--error-color)">❌ Authentication failed</span>';
+      mainStatus.innerHTML = '<span style="color: var(--info-color)">⏳ Waiting for user to validate secure key access...</span>';
     }
   }
 }