Make platforms-lib-test a devDependency

This way, it can be ignored when installing with `NODE_ENV=production`.

Context TextsHQ/texts-app-desktop#565

package.json

@@ -37,6 +37,7 @@
   },
   "devDependencies": {
     "@textshq/eslint-config": "https://github.com/TextsHQ/eslint-config#main",
+    "@textshq/platform-test-lib": "https://github.com/TextsHQ/platform-test-lib#main",
     "@types/better-sqlite3": "^7.6.5",
     "@types/bun": "^1.0.0",
     "@types/eslint": "^8.21.3",
@@ -50,8 +51,5 @@
     "rimraf": "^5.0.5",
     "typescript": "^5.0.2"
   },
-  "optionalDependencies": {
-    "@textshq/platform-test-lib": "https://github.com/TextsHQ/platform-test-lib#main"
-  },
   "packageManager": "[email protected]"
 }

yarn.lock

@@ -2400,9 +2400,6 @@ __metadata:
     tough-cookie: "npm:^4.1.2"
     typescript: "npm:^5.0.2"
     utf-8-validate: "npm:^6.0.3"
-  dependenciesMeta:
-    "@textshq/platform-test-lib":
-      optional: true
   languageName: unknown
   linkType: soft