chore: remove postcss (#18831)

web/package-lock.json

@@ -47,7 +47,6 @@
         "@sveltejs/enhanced-img": "^0.6.0",
         "@sveltejs/kit": "^2.15.2",
         "@sveltejs/vite-plugin-svelte": "^5.0.3",
-        "@tailwindcss/postcss": "^4.1.7",
         "@tailwindcss/vite": "^4.1.7",
         "@testing-library/jest-dom": "^6.4.2",
         "@testing-library/svelte": "^5.2.8",
@@ -68,7 +67,6 @@
         "eslint-plugin-unicorn": "^57.0.0",
         "factory.ts": "^1.4.1",
         "globals": "^16.0.0",
-        "postcss": "^8.5.0",
         "prettier": "^3.4.2",
         "prettier-plugin-organize-imports": "^4.0.0",
         "prettier-plugin-sort-json": "^4.1.1",
@@ -103,19 +101,6 @@
       "dev": true,
       "license": "MIT"
     },
-    "node_modules/@alloc/quick-lru": {
-      "version": "5.2.0",
-      "resolved": "https://registry.npmjs.org/@alloc/quick-lru/-/quick-lru-5.2.0.tgz",
-      "integrity": "sha512-UrcABB+4bUrFABwbluTIBErXwvbsU/V7TZWfmbgJfbkwiBuziS9gxdODUyuiecfdGQ85jglMW6juS3+z5TsKLw==",
-      "dev": true,
-      "license": "MIT",
-      "engines": {
-        "node": ">=10"
-      },
-      "funding": {
-        "url": "https://github.com/sponsors/sindresorhus"
-      }
-    },
     "node_modules/@ampproject/remapping": {
       "version": "2.3.0",
       "resolved": "https://registry.npmjs.org/@ampproject/remapping/-/remapping-2.3.0.tgz",
@@ -2642,20 +2627,6 @@
         "node": ">=18"
       }
     },
-    "node_modules/@tailwindcss/postcss": {
-      "version": "4.1.7",
-      "resolved": "https://registry.npmjs.org/@tailwindcss/postcss/-/postcss-4.1.7.tgz",
-      "integrity": "sha512-88g3qmNZn7jDgrrcp3ZXEQfp9CVox7xjP1HN2TFKI03CltPVd/c61ydn5qJJL8FYunn0OqBaW5HNUga0kmPVvw==",
-      "dev": true,
-      "license": "MIT",
-      "dependencies": {
-        "@alloc/quick-lru": "^5.2.0",
-        "@tailwindcss/node": "4.1.7",
-        "@tailwindcss/oxide": "4.1.7",
-        "postcss": "^8.4.41",
-        "tailwindcss": "4.1.7"
-      }
-    },
     "node_modules/@tailwindcss/vite": {
       "version": "4.1.7",
       "resolved": "https://registry.npmjs.org/@tailwindcss/vite/-/vite-4.1.7.tgz",