Easier to dismiss popups: close button and swipe down

Sheets (including Now Playing) get a close button, an animated close and swipe-down on phones; lyrics and the visualizer close on swipe-down too.

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

public/sw.js

@@ -1,5 +1,5 @@
 // App-shell cache only; Seafile/API traffic always goes to the network.
-const CACHE = 'hub-v90';
+const CACHE = 'hub-v94';
 const SHARE = 'hub-share'; // files shared into the app from other apps, held until the person picks a folder
 const SHELL = ['/icon.svg', '/manifest.webmanifest', '/icons/icon-192.png', '/icons/apple-touch-icon.png'];