Add emoji rendering to improve post preview accuracy

Install `twemoji` and implement `emojiUtils.ts` to parse and render emojis correctly in the post preview, ensuring consistency with actual published content.

Replit-Commit-Author: Agent
Replit-Commit-Session-Id: ae4037a0-2a6f-4530-9bac-79b543286bda
Replit-Commit-Checkpoint-Type: intermediate_checkpoint
Replit-Commit-Event-Id: 605c7efc-6cfc-498b-bf39-42e925354f36
Replit-Commit-Screenshot-Url: https://storage.googleapis.com/screenshot-production-us-central1/397bca8c-984f-43ff-841a-10897aeb8140/ae4037a0-2a6f-4530-9bac-79b543286bda/JcM96XE

package.json

@@ -88,6 +88,7 @@
     "tailwind-merge": "^2.6.0",
     "tailwindcss-animate": "^1.0.7",
     "tw-animate-css": "^1.2.5",
+    "twemoji": "^14.0.2",
     "twemoji-parser": "^14.0.0",
     "vaul": "^1.1.2",
     "wouter": "^3.3.5",