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>

package.json

@@ -11,6 +11,7 @@
   },
   "dependencies": {
     "@calcom/embed-react": "^1.5.3",
+    "@google/genai": "^1.46.0",
     "@payloadcms/db-postgres": "^3.80.0",
     "@payloadcms/next": "^3.80.0",
     "@payloadcms/richtext-lexical": "^3.80.0",
@@ -18,6 +19,7 @@
     "@types/node": "^25.5.0",
     "@types/nodemailer": "^7.0.11",
     "@types/react": "^19.2.14",
+    "cheerio": "^1.2.0",
     "clsx": "^2.1.1",
     "framer-motion": "^12.38.0",
     "graphql": "^16.13.2",
@@ -28,6 +30,7 @@
     "payload": "^3.80.0",
     "react": "^19.2.4",
     "react-dom": "^19.2.4",
+    "react-international-phone": "^4.8.0",
     "sharp": "^0.34.5",
     "typescript": "^5.9.3"
   },