feat: add Twemoji for cross-platform emoji rendering

Wrap the app in react-twemoji to replace native Unicode emoji with
Twemoji SVGs from CDN. Fixes ugly/broken emoji on Windows.

package.json

@@ -48,6 +48,7 @@
     "react-dom": "^19.2.4",
     "react-i18next": "^16.5.4",
     "react-router": "^7.13.0",
+    "react-twemoji": "^0.7.2",
     "tailwind-merge": "^3.4.0",
     "zustand": "^5.0.11"
   },
@@ -57,6 +58,7 @@
     "@types/node": "^25.2.1",
     "@types/react": "^19.2.13",
     "@types/react-dom": "^19.2.3",
+    "@types/react-twemoji": "^0.4.3",
     "@vitejs/plugin-react": "^5.1.2",
     "eslint": "^9.39.2",
     "eslint-config-prettier": "^10.1.8",