feat(app): turn on AccessKit, and name the controls drawn as icons

eframe now builds with its accesskit feature, so the widget tree reaches
the platform screen reader. Buttons drawn as an icon glyph were read as
the icon font's private code point, and the hand-painted ones (play,
poster tiles, the watched mark, download rings, the seek bar) as
nothing. A Named trait gives them a name, and hint() makes the existing
hover text that name.

crates/pstr-app/src/ui/title.rs

@@ -8,6 +8,7 @@ use crate::app::{Action, Page};
 use crate::engine::{DownloadItem, DownloadKey, DownloadState};
 use crate::playback::PlaybackTarget;
 use crate::theme;
+use crate::ui::widgets::Named;
 use crate::ui::{self, Art, Card};
 
 pub struct OfflineView<'a> {
@@ -878,6 +879,7 @@ pub(crate) fn still(
     actions: &mut Vec<Action>,
 ) {
     let (rect, response) = ui.allocate_exact_size(size, egui::Sense::click());
+    let response = response.named(format!("Play {}", episode.label()));
     if !ui.is_rect_visible(rect) {
         return;
     }