Remove duplicate autoprefixer, postcss, tailwindcss from dependencies

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

package.json

@@ -15,7 +15,6 @@
     "lint": "eslint . --ext .vue,.js,.jsx,.cjs,.mjs --fix --ignore-path .gitignore"
   },
   "dependencies": {
-    "autoprefixer": "^10.4.13",
     "axios": "^1.7.2",
     "chart.js": "^4.3.0",
     "chartjs-adapter-date-fns": "^3.0.0",
@@ -37,10 +36,8 @@
     "npx": "^10.2.2",
     "pinia": "^2.0.28",
     "pinia-plugin-persistedstate": "^3.2.3",
-    "postcss": "^8.4.20",
     "primeicons": "^6.0.1",
     "primevue": "^3.53.0",
-    "tailwindcss": "^3.2.4",
     "tippy.js": "^6.3.7",
     "vue": "^3.2.45",
     "vue-axios": "^3.5.2",