feat: website analysis pipeline, voice agent, configurator improvements

- Site analysis: cheerio HTML parsing, inline tech stack detection (~20 CMS/framework/analytics signatures), Google PageSpeed API integration
- Gemini Live voice agent: WebSocket-based real-time voice mode with live transcript, selection chips, and mid-conversation website analysis
- Type/Talk mode toggle with silent capability detection
- Stepped progress animation during brief generation (4 animated steps)
- URL + thoughts fields in Step 2, phone + contact preference in Step 3
- AI prompt improvements: dedicated website analysis section, 30-min call, concrete benefits, industry depth
- Email redesign: branded templates with logo, proper markdown rendering for both client and admin
- French locale support for AI-generated briefs
- Smaller checkmark, compact booking CTA, expanded brief area

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

src/i18n/messages/en.json

@@ -70,8 +70,8 @@
     "complete": {
       "title": "Your project brief is ready",
       "subtitle": "Check your inbox - we've sent a detailed brief to {email}",
-      "bookTitle": "Book a Consultation",
-      "bookSubtitle": "30 minutes to discuss your brief with our team",
+      "nextStep": "Next step: let's talk through your brief",
+      "bookSubtitle": "Book a free 30-minute call to discuss your project and next steps.",
       "bookCall": "Book a Call",
       "briefPreview": "Your project brief",
       "reachDirectly": "Or reach us directly at"
@@ -136,13 +136,43 @@
       "timeline": "Timeline",
       "name": "Your name",
       "company": "Company",
-      "email": "Email address"
+      "email": "Email address",
+      "phone": "Phone",
+      "phoneOptional": "(optional)",
+      "contactPreference": "Preferred contact method",
+      "contactEmail": "Email",
+      "contactPhone": "Phone",
+      "contactWhatsapp": "WhatsApp",
+      "currentSiteUrl": "Current website",
+      "currentSiteUrlOptional": "(optional)",
+      "currentSiteUrlPlaceholder": "https://yourwebsite.com",
+      "currentSiteThoughts": "Thoughts on your current site",
+      "currentSiteThoughtsPlaceholder": "What's working, what isn't, what you'd like to change..."
     },
     "summary": {
       "heading": "Your selections",
       "aiEnhancement": "AI Enhancement"
     },
     "generating": "Generating",
+    "generatingSteps": {
+      "preparingBrief": "Preparing your brief",
+      "analyzingSite": "Analyzing your current website",
+      "runningAudit": "Running performance audit",
+      "generatingBrief": "Generating your personalized brief"
+    },
+    "mode": {
+      "type": "Type",
+      "talk": "Talk"
+    },
+    "voice": {
+      "agentName": "LetsBe project assistant",
+      "capturedSoFar": "Captured so far",
+      "endConversation": "End Conversation",
+      "analyzingSite": "Analyzing your site...",
+      "connecting": "Connecting...",
+      "mute": "Mute",
+      "unmute": "Unmute"
+    },
     "privacy": "Your information is private and will never be shared.",
     "generateBrief": "Generate My Brief",
     "nextStep": "Next Step",

src/i18n/messages/fr.json

@@ -70,8 +70,8 @@
     "complete": {
       "title": "Votre brief projet est prêt",
       "subtitle": "Vérifiez votre boîte mail - nous avons envoyé un brief détaillé à {email}",
-      "bookTitle": "Réservez une Consultation",
-      "bookSubtitle": "30 minutes pour discuter de votre brief avec notre équipe",
+      "nextStep": "Prochaine étape : discutons de votre brief",
+      "bookSubtitle": "Réservez un appel gratuit de 30 minutes pour discuter de votre projet.",
       "bookCall": "Réserver un Appel",
       "briefPreview": "Votre brief projet",
       "reachDirectly": "Ou contactez-nous directement à"
@@ -136,13 +136,43 @@
       "timeline": "Calendrier",
       "name": "Votre nom",
       "company": "Entreprise",
-      "email": "Adresse email"
+      "email": "Adresse email",
+      "phone": "Téléphone",
+      "phoneOptional": "(facultatif)",
+      "contactPreference": "Mode de contact préféré",
+      "contactEmail": "Email",
+      "contactPhone": "Téléphone",
+      "contactWhatsapp": "WhatsApp",
+      "currentSiteUrl": "Site web actuel",
+      "currentSiteUrlOptional": "(facultatif)",
+      "currentSiteUrlPlaceholder": "https://votresite.com",
+      "currentSiteThoughts": "Vos impressions sur votre site actuel",
+      "currentSiteThoughtsPlaceholder": "Ce qui fonctionne, ce qui ne fonctionne pas, ce que vous aimeriez changer..."
     },
     "summary": {
       "heading": "Vos sélections",
       "aiEnhancement": "Enrichissement IA"
     },
     "generating": "Génération",
+    "generatingSteps": {
+      "preparingBrief": "Préparation de votre brief",
+      "analyzingSite": "Analyse de votre site actuel",
+      "runningAudit": "Audit de performance en cours",
+      "generatingBrief": "Génération de votre brief personnalisé"
+    },
+    "mode": {
+      "type": "Écrire",
+      "talk": "Parler"
+    },
+    "voice": {
+      "agentName": "Assistant projet LetsBe",
+      "capturedSoFar": "Informations recueillies",
+      "endConversation": "Terminer la conversation",
+      "analyzingSite": "Analyse de votre site...",
+      "connecting": "Connexion en cours...",
+      "mute": "Couper le micro",
+      "unmute": "Activer le micro"
+    },
     "privacy": "Vos informations sont privées et ne seront jamais partagées.",
     "generateBrief": "Générer Mon Brief",
     "nextStep": "Étape Suivante",