feat(ui) add Save Queue to Playlist (#4110)

* ui: add save queue to playlist

* fix(ui): improve toolbar layout

Signed-off-by: Deluan <deluan@navidrome.org>

* fix(ui): add loading state to save queue dialog

Signed-off-by: Deluan <deluan@navidrome.org>

* fix(ui): refresh playlist after saving queue

Signed-off-by: Deluan <deluan@navidrome.org>

* fix lint

Signed-off-by: Deluan <deluan@navidrome.org>

* remove duplication in PlayerToolbar and add tests

Signed-off-by: Deluan <deluan@navidrome.org>

* fix(i18n): update save queue text for clarity in English and Portuguese

Signed-off-by: Deluan <deluan@navidrome.org>

---------

Signed-off-by: Deluan <deluan@navidrome.org>

ui/src/i18n/en.json

@@ -192,6 +192,7 @@
         "selectPlaylist": "Select a playlist:",
         "addNewPlaylist": "Create \"%{name}\"",
         "export": "Export",
+        "saveQueue": "Save Queue to Playlist",
         "makePublic": "Make Public",
         "makePrivate": "Make Private"
       },