Refactoring: merge video-watch scope into common.

In order to be able to use lit in videowatch related code, we have to
merge these scopes.

client/common/videowatch/register.ts

@@ -0,0 +1,34 @@
+// SPDX-FileCopyrightText: 2024 John Livingston <https://www.john-livingston.fr/>
+//
+// SPDX-License-Identifier: AGPL-3.0-only
+
+import type { Video } from '@peertube/peertube-types'
+import { getPtContext } from '../lib/contexts/peertube'
+import { initChat } from './chat'
+
+interface VideoWatchLoadedHookOptions {
+  videojs: any
+  video: Video
+  playlist?: any
+}
+
+export async function registerVideoWatch (): Promise<void> {
+  const ptContext = getPtContext()
+  ptContext.ptOptions.registerHook({
+    target: 'action:video-watch.video.loaded',
+    handler: ({
+      video,
+      playlist
+    }: VideoWatchLoadedHookOptions) => {
+      if (!video) {
+        ptContext.logger.error('No video argument in hook action:video-watch.video.loaded')
+        return
+      }
+      if (playlist) {
+        ptContext.logger.info('We are in a playlist, we will not use the webchat')
+        return
+      }
+      initChat(video).then(() => {}, () => {})
+    }
+  })
+}