improve error reporting, ajax form upload

package.json

@@ -4,7 +4,8 @@
   "description": "Send ebooks to Kobo/Kindle ereaders easily",
   "main": "index.js",
   "scripts": {
-    "start": "node index"
+    "start": "node index",
+    "postinstall": "patch-package"
   },
   "author": "djazz",
   "license": "MIT",
@@ -12,13 +13,13 @@
     "@koa/multer": "^3.0.2",
     "@koa/router": "^12.0.1",
     "file-type": "^16.5.4",
-    "koa": "^2.14.2",
+    "koa": "^2.15.3",
     "koa-logger": "^3.2.1",
-    "koa-mount": "^4.0.0",
     "koa-sendfile": "^3.0.0",
     "koa-static": "^5.0.0",
     "mkdirp": "^3.0.1",
     "multer": "^1.4.5-lts.1",
+    "patch-package": "^8.0.0",
     "transliteration": "^2.3.5"
   }
 }