Inspector: replace sass with postcss

package.json

@@ -1,27 +1,25 @@
 {
 	"type": "module",
 	"scripts": {
-        "dev": "vite --config tools/vite.config.ts",
-        "build": "vite build --config tools/vite.config.ts",
-        "preview": "vite preview",
-        "check": "svelte-check --workspace ui --tsconfig ./../tools/tsconfig.json",
-        "lint": "prettier --check --plugin-search-dir=. ./ui --config ./tools/.prettierrc --ignore-path ./tools/.prettierignore",
-        "format": "prettier --write --plugin-search-dir=. ./ui --config ./tools/.prettierrc --ignore-path ./tools/.prettierignore"
-    },
-    "dependencies": {
-        "svelte-portal": "^2.2.0"
-    },
-    "devDependencies": {
-        "@sveltejs/vite-plugin-svelte": "^1.0.1",
-        "@tsconfig/svelte": "^3.0.0",
-        "prettier": "^2.7.1",
-        "prettier-plugin-svelte": "^2.7.0",
-        "sass": "^1.54.4",
-        "svelte": "^3.49.0",
-        "svelte-check": "^2.8.0",
-        "svelte-preprocess": "^4.10.7",
-        "tslib": "^2.4.0",
-        "typescript": "^4.6.4",
-        "vite": "^3.0.7"
-    }
+		"dev": "vite --config tools/vite.config.ts",
+		"build": "vite build --config tools/vite.config.ts",
+		"preview": "vite preview",
+		"check": "svelte-check --workspace ui --tsconfig ./../tools/tsconfig.json",
+		"lint": "prettier --check --plugin-search-dir=. ./ui --config ./tools/.prettierrc --ignore-path ./tools/.prettierignore",
+		"format": "prettier --write --plugin-search-dir=. ./ui --config ./tools/.prettierrc --ignore-path ./tools/.prettierignore"
+	},
+	"devDependencies": {
+		"@sveltejs/vite-plugin-svelte": "^1.0.1",
+		"@tsconfig/svelte": "^3.0.0",
+		"postcss-nested": "^6.0.1",
+		"prettier": "^2.7.1",
+		"prettier-plugin-svelte": "^2.7.0",
+		"svelte": "^3.49.0",
+		"svelte-check": "^2.8.0",
+		"svelte-portal": "^2.2.0",
+		"svelte-preprocess": "^4.10.7",
+		"tslib": "^2.4.0",
+		"typescript": "^4.6.4",
+		"vite": "^3.0.7"
+	}
 }

tools/postcss.config.cjs

@@ -0,0 +1,5 @@
+module.exports = {
+	plugins: [
+		require('postcss-nested'),
+	],
+}

tools/vite.config.ts

@@ -1,14 +1,16 @@
 import {defineConfig} from "vite"
 import {svelte} from "@sveltejs/vite-plugin-svelte"
 
-// https://vitejs.dev/config/
 export default defineConfig({
 	plugins: [
 		svelte({
 			configFile: '../tools/svelte.config.js',
 		})
 	],
 	root: "ui",
+	css: {
+		postcss: __dirname + '/postcss.config.cjs',
+	},
 	build: {
 		rollupOptions: {
 			input: "ui/src/main.ts",