chore(web): merge "Add to album" and "Add to shared album" actions into a single action (#24669)

* refactor: simplify album selection actions by removing shared option

* Removed the shared option from AddToAlbumAction and related components.
* Updated AlbumPickerModal and other components to reflect this change.
* Cleaned up related tests and documentation for consistency.

* fix lint

web/src/lib/components/memory-page/memory-viewer.svelte

@@ -48,7 +48,6 @@
     mdiImageSearch,
     mdiPause,
     mdiPlay,
-    mdiPlus,
     mdiSelectAll,
     mdiVolumeHigh,
     mdiVolumeOff,
@@ -339,10 +338,7 @@
         onclick={handleSelectAll}
       />
 
-      <ButtonContextMenu icon={mdiPlus} title={$t('add_to')}>
-        <AddToAlbum />
-        <AddToAlbum shared />
-      </ButtonContextMenu>
+      <AddToAlbum />
 
       <FavoriteAction removeFavorite={assetInteraction.isAllFavorite} />