fix(photoswipe): target currSlide.container not currSlide.el

pswp.currSlide is a Slide instance whose DOM element is stored as
.container (.pswp__zoom-wrap). The .el property belongs to the
itemHolder wrapper, not the Slide — so currSlide.el was always
undefined, the null-guard exited early, and no animation played.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Vgmzx8VTTTmCskSpQtsLTr

themes/intotheeast/templates/home.html.twig

@@ -159,7 +159,7 @@ lightbox.on('afterOpen', function () {
         if (!keyDir) return;
         var dir = keyDir;
         keyDir = 0;
-        var el = pswp.currSlide && pswp.currSlide.el;
+        var el = pswp.currSlide && pswp.currSlide.container;
         if (!el) return;
         el.classList.remove('pswp-key-from-left', 'pswp-key-from-right');
         el.offsetWidth;