Switch to dart-sass and make deploy script fail-safe

node-sass 4.x cannot build on arm64/Node 16. Use sass with ::v-deep
instead of /deep/, and only replace the server dist after the upload
is unpacked and verified.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

package.json

@@ -47,6 +47,7 @@
     "eslint-plugin-vue": "^5.0.0",
     "node-sass": "^4.9.0",
     "qs": "^6.9.0",
+    "sass": "^1.32.13",
     "sass-loader": "^7.1.0",
     "vue-cropper": "^0.4.9",
     "vue-template-compiler": "^2.6.10"