feat: optionally gzip large save uploads with fallback (#5259)

* feat: optionally gzip large save uploads with fallback

* fix: replace Safari-prone save compression with fflate fallback

* refactor: align save upload compression with review feedback

* refactor: use compressRequest wrapper for save uploads

* Refactor request compression settings

* Fix default value

* Avoid null in bytes parsing result

* fix: switch request compression to fflate gzip

* fix: add request compression maxBytes cap and clarify timeout semantics

* Refresh package-lock.json

* Unify payload limit setting names

* Expose compression termination function

* Add compression to group chat saves

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Co-authored-by: Roland4396 <Roland4396@users.noreply.github.com>
Co-authored-by: Cohee <18619528+Cohee1207@users.noreply.github.com>

package.json

@@ -48,6 +48,7 @@
         "droll": "^0.2.1",
         "env-paths": "^3.0.0",
         "express": "^4.21.0",
+        "fflate": "^0.8.2",
         "form-data": "^4.0.4",
         "fuse.js": "^7.1.0",
         "google-translate-api-x": "^10.7.2",