Remove the Academy films

The generated videos weren't good enough — pull the films card, its
styles, and the video assets. The service-worker hardening stays: media
paths bypass the cache (Range/206 responses) and only full 200 responses
are cached.

Co-Authored-By: Claude Fable 5 <[email protected]>

public/js/academy.js

@@ -97,9 +97,6 @@ function renderMenu() {
 function openLesson(track, lesson, index) {
 	current = { track, lesson, index };
 	$("academy-menu").classList.add("hidden");
-	$("academy-films")?.classList.add("hidden");
-	// Pause any playing film so it doesn't run (and download) behind the lesson.
-	for (const video of document.querySelectorAll("#academy-films video")) video.pause();
 	$("academy-player").classList.remove("hidden");
 	renderSlide();
 }
@@ -109,7 +106,6 @@ function closeLesson() {
 	current = null;
 	$("academy-player").classList.add("hidden");
 	$("academy-menu").classList.remove("hidden");
-	$("academy-films")?.classList.remove("hidden");
 	renderMenu(); // reflect fresh progress
 }