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

---------

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

package-lock.json

@@ -58,6 +58,7 @@
                 "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",
@@ -5095,6 +5096,12 @@
                 "node": "^12.20 || >= 14.13"
             }
         },
+        "node_modules/fflate": {
+            "version": "0.8.2",
+            "resolved": "https://registry.npmjs.org/fflate/-/fflate-0.8.2.tgz",
+            "integrity": "sha512-cPJU47OaAoCbg0pBvzsgpTPhmhqI5eJjh/JIu8tPj5q+T7iLvW/JAYUqmE7KOB4R1ZyEhzBaIQpQpardBF5z8A==",
+            "license": "MIT"
+        },
         "node_modules/file-entry-cache": {
             "version": "6.0.1",
             "resolved": "https://registry.npmjs.org/file-entry-cache/-/file-entry-cache-6.0.1.tgz",