Resolve "Ensure all buttons in the application are operable using only the keyboard"

front/src/components/Queue.vue

front/src/components/audio/PlayButton.vue

front/src/components/audio/Player.vue

front/src/components/audio/VolumeControl.vue

front/src/components/common/AttachmentInput.vue

front/src/components/common/DangerousButton.vue

front/src/components/federation/FetchButton.vue

front/src/components/forms/PasswordInput.vue

front/src/components/library/AlbumDropdown.vue

front/src/components/library/ArtistBase.vue

front/src/components/library/ImportStatusModal.vue

front/src/components/library/TrackBase.vue

front/src/components/library/radios/Filter.vue

.../src/components/manage/moderation/InstancePolicyModal.vue

front/src/components/notifications/NotificationRow.vue

front/src/components/playlists/Editor.vue

front/src/components/playlists/PlaylistModal.vue

front/src/main.js

front/src/style/components/_play_button.scss

front/src/style/components/_player.scss