feat(web): add support for casting (#18231)

* recreate #13966

* gcast button works

* rewrote gcast-player to be GCastDestination and CastManager manages the interface between UI and casting destinations

* remove unneeded imports

* add "Connected to" translation

* Remove css for cast launcher

* fix tests

* fix doc tests

* fix the receiver application ID

* remove casting app ID

* remove cast button from nav bar

It is now present at the following locations:

- shared link album and single asset views
- asset viewer (normal user)
- album view (normal user)

* part 1 of fixes from @danieldietzler code review

* part 2 of code review changes from @danieldietzler and @jsram91

* cleanup documentation

* onVideoStarted missing callback

* add token expiry validation

* cleanup logic and logging

* small cleanup

* rename to ICastDestination

* cast button changes

web/src/routes/(user)/albums/[albumId=id]/[[photos=photos]]/[[assetId=id]]/+page.svelte

@@ -1,6 +1,7 @@
 <script lang="ts">
   import { afterNavigate, goto, onNavigate } from '$app/navigation';
   import { scrollMemoryClearer } from '$lib/actions/scroll-memory';
+  import CastButton from '$lib/cast/cast-button.svelte';
   import AlbumDescription from '$lib/components/album-page/album-description.svelte';
   import AlbumMap from '$lib/components/album-page/album-map.svelte';
   import AlbumOptions from '$lib/components/album-page/album-options.svelte';
@@ -620,6 +621,8 @@
       {#if viewMode === AlbumPageViewMode.VIEW}
         <ControlAppBar showBackButton backIcon={mdiArrowLeft} onClose={() => goto(backUrl)}>
           {#snippet trailing()}
+            <CastButton whiteHover />
+
             {#if isEditor}
               <CircleIconButton
                 title={$t('add_photos')}