fix: lazy load files sidebar tab

The global sidebar tab entrypoint was eagerly importing the Files tab
component, which pulled LibreSign router code into unrelated apps and
rewrote app navigation paths such as Deck.

Fixes #7321

Signed-off-by: Vitor Mattos <1079143+vitormattos@users.noreply.github.com>

Author: vitormattos

src/tab.ts

@@ -4,16 +4,14 @@
  */
 
 import { createPinia } from 'pinia'
-import { createApp } from 'vue'
+import { createApp, type App as VueApp } from 'vue'
 
 import { loadState } from '@nextcloud/initial-state'
 import { t, n } from '@nextcloud/l10n'
 import { FileType } from '@nextcloud/files'
 
 import LibreSignLogoDarkSvg from '../img/app-dark.svg?raw'
 
-import AppFilesTab from './components/RightSidebar/AppFilesTab.vue'
-
 import './style/icons.scss'
 
 if (!window.OCA.Libresign) {