Fix Tailwind CSS styling configuration

- Add tailwind.config.ts with proper content paths and theme config
- Add postcss.config.js for Tailwind and autoprefixer processing
- Downgrade tailwindcss to v3.4.17 and add missing PostCSS dependencies
- Update Dockerfile to clarify build process
- Fix UI styling issues in Docker environment

package.json

@@ -42,12 +42,13 @@
   },
   "devDependencies": {
     "@eslint/eslintrc": "^3",
-    "@tailwindcss/postcss": "^4",
     "@types/node": "^20",
     "@types/react": "^19",
+    "autoprefixer": "^10.4.20",
     "eslint": "^9",
     "eslint-config-next": "15.3.5",
-    "tailwindcss": "^4",
+    "postcss": "^8.4.49",
+    "tailwindcss": "^3.4.17",
     "typescript": "^5.8.3"
   }
 }