Misc app mode fixes (#9368)

A working branch of smaller app mode fixes. Can be merged at any time
and I'll make a new branch.
- Selected inputs and outputs can now be re-ordered when clicking on
label text
- 3d outputs once again display correctly
- Some padding has been added to the side so that control buttons don't
overlap with the floating app sidebar controls
- A "Share" button placeholder has been added to the menu, but is
disabled
- Adds a workaround for canvas read_only state being disabled when
'space' is pressed.
  - This one is particularly hacky, and can be pulled out if problematic
- Fix download all only downloading the first output

┆Issue is synchronized with this [Notion
page](https://www.notion.so/PR-9368-Misc-app-mode-fixes-3196d73d365081eab02ad1e693784707)
by [Unito](https://www.unito.io)

src/composables/useWorkflowActionsMenu.ts

@@ -187,6 +187,15 @@ export function useWorkflowActionsMenu(
       visible: isRoot
     })
 
+    addItem({
+      id: 'share',
+      label: t('menuLabels.Share'),
+      icon: 'icon-[comfy--send]',
+      command: async () => {},
+      disabled: true,
+      visible: isRoot
+    })
+
     addItem({
       id: 'enter-app-mode',
       label: t('breadcrumbsMenu.enterAppMode'),