Add expand/compress image button on image view box (#15068)

* add zoom image button

* enhance zoom algorithm & add translation

* code structure

* code structure

* code structure

* enhance grab performance

* rm useless state

* fix behavior on Firefox & scroll lock & horizontal scroll with mousewheel

* remove scroll lock on MouseWheelEvent

* code structure

* enhance algorithm and code structure

* rm Gemfile.lock from tree

* codeclimate

* fix a stupid mistake

app/javascript/styles/mastodon/components.scss

@@ -1720,6 +1720,20 @@ a.account__display-name {
   align-items: center;
   justify-content: center;
   flex-direction: column;
+  scrollbar-width: none; /* Firefox */
+  -ms-overflow-style: none;  /* IE 10+ */
+
+  * {
+    scrollbar-width: none; /* Firefox */
+    -ms-overflow-style: none;  /* IE 10+ */
+  }
+
+  &::-webkit-scrollbar,
+  *::-webkit-scrollbar {
+    width: 0;
+    height: 0;
+    background: transparent; /* Chrome/Safari/Webkit */
+  }
 
   .image-loader__preview-canvas {
     max-width: $media-modal-media-max-width;
@@ -4606,6 +4620,21 @@ a.status-card.compact:hover {
   z-index: 100;
 }
 
+.media-modal__zoom-button {
+  position: absolute;
+  right: 64px;
+  top: 8px;
+  z-index: 100;
+  pointer-events: auto;
+  transition: opacity 0.3s linear;
+  will-change: opacity;
+}
+
+.media-modal__zoom-button--hidden {
+  pointer-events: none;
+  opacity: 0;
+}
+
 .onboarding-modal,
 .error-modal,
 .embed-modal {