feat: add emoji picker to chat room message input

- Integrated emoji-picker-element library for emoji selection
- Added emoji toggle button in message input container
- Implemented emoji picker show/hide functionality
- Created CSS styles for emoji picker positioning
- Added event handling for emoji selection and outside click
- Updated package.json to include emoji-picker-element dependency
- Modified Prisma schema to use TEXT type for message content
- Updated Prisma migration scripts to use dotenv for environment configuration

apps/api/prisma/migrations/20250307053052_update_content_type/migration.sql

@@ -0,0 +1,2 @@
+-- AlterTable
+ALTER TABLE `Message` MODIFY `content` TEXT NOT NULL;