fix: use Background.change() (native full-page path) instead of immediately()

plugin.js

@@ -341,7 +341,7 @@
         this.destroy = function () {
             // Let Lampa clear the background natively.
             try {
-                if (Lampa.Background && Lampa.Background.immediately) Lampa.Background.immediately('');
+                if (Lampa.Background && Lampa.Background.change) Lampa.Background.change('');
             } catch (e) {}
         };
 
@@ -370,7 +370,7 @@
                         back: function () {
                             // Let Lampa clear the background natively (matches built-in pages).
                             try {
-                                if (Lampa.Background && Lampa.Background.immediately) Lampa.Background.immediately('');
+                                if (Lampa.Background && Lampa.Background.change) Lampa.Background.change('');
                             } catch (e) {}
                             Lampa.Activity.backward();
                         },
@@ -407,13 +407,14 @@
             // controller or steal focus once it's already set.
             apply();
             // Use Lampa's native background (canvas blur + fade), exactly like a
-            // built-in movie page. Do NOT touch .background via CSS — Lampa owns it.
+            // built-in movie page. Native full pages call Background.change(),
+            // not immediately() (which is throttled and can no-op on open).
             try {
                 var dm = resolveMovie((comp.activity && comp.activity.object) || selected);
                 var bg = resolve(dm.img || dm.poster || dm.cover);
                 console.log('[mymovies] bg=', bg);
-                if (bg && Lampa.Background && Lampa.Background.immediately) {
-                    Lampa.Background.immediately(bg);
+                if (bg && Lampa.Background && Lampa.Background.change) {
+                    Lampa.Background.change(bg);
                 }
             } catch (e) { console.log('[mymovies] bg err', e); }
             if (!$('.mymovies-detail .full-start-new__buttons .full-start__button.selector').length) {