fix(a11y): let a clipped value be read, and name a row's own buttons

a11y.24: `text-overflow: ellipsis` in 40+ places, and the four
highest-density lists were the ones with no `title` — the queue panel
(whose width is user-resizable down to MIN_WIDTH), track-info, every
track-list cell, and the playlist sidebar.

In track-list the attribute is on the *cell*, not on what is inside it:
the value may be a link, a highlighted search match or plain text, and
a tooltip is inherited by descendants either way. One binding rather
than three, and the same value the accessor already computed.

a11y.32: every queue row's remove button was named "Remove from queue",
so a list whose entire purpose is which track is where had four
identically named controls.

frontend/src/components/playlist-view/playlist-view.ts

@@ -1786,6 +1786,7 @@ export class PlaylistView extends ViewLifecycleMixin(LitElement) {
                         : html`
                               <span
                                   class="playlist-name"
+                                  title=${entry.summary.Name}
                               >
                                   ${entry.summary
                                       .Name}