set up prettier

installer-gui/package-lock.json

@@ -18,6 +18,8 @@
         "@sveltejs/kit": "^2.9.0",
         "@sveltejs/vite-plugin-svelte": "^5.0.0",
         "@tauri-apps/cli": "^2",
+        "prettier": "^3.6.2",
+        "prettier-plugin-svelte": "^3.4.0",
         "svelte": "^5.0.0",
         "svelte-check": "^4.0.0",
         "typescript": "~5.6.2",
@@ -1524,6 +1526,33 @@
         "node": "^10 || ^12 || >=14"
       }
     },
+    "node_modules/prettier": {
+      "version": "3.6.2",
+      "resolved": "https://registry.npmjs.org/prettier/-/prettier-3.6.2.tgz",
+      "integrity": "sha512-I7AIg5boAr5R0FFtJ6rCfD+LFsWHp81dolrFD8S79U9tb8Az2nGrJncnMSnys+bpQJfRUzqs9hnA81OAA3hCuQ==",
+      "dev": true,
+      "license": "MIT",
+      "bin": {
+        "prettier": "bin/prettier.cjs"
+      },
+      "engines": {
+        "node": ">=14"
+      },
+      "funding": {
+        "url": "https://github.com/prettier/prettier?sponsor=1"
+      }
+    },
+    "node_modules/prettier-plugin-svelte": {
+      "version": "3.4.0",
+      "resolved": "https://registry.npmjs.org/prettier-plugin-svelte/-/prettier-plugin-svelte-3.4.0.tgz",
+      "integrity": "sha512-pn1ra/0mPObzqoIQn/vUTR3ZZI6UuZ0sHqMK5x2jMLGrs53h0sXhkVuDcrlssHwIMk7FYrMjHBPoUSyyEEDlBQ==",
+      "dev": true,
+      "license": "MIT",
+      "peerDependencies": {
+        "prettier": "^3.0.0",
+        "svelte": "^3.2.0 || ^4.0.0-next.0 || ^5.0.0-next.0"
+      }
+    },
     "node_modules/readdirp": {
       "version": "4.1.2",
       "resolved": "https://registry.npmjs.org/readdirp/-/readdirp-4.1.2.tgz",