fix: blocked autoplay left 'Loading…' parked over unreachable controls

The overlay only clears on 'playing', which never fires when the browser
blocks autoplay — and the overlay covers the native controls, so the
'swap to the native play button' assumption from the click-to-play
removal never held. A rejected v.play() is the signal: swap the dead
Loading… overlay for a tappable one (Play), and a second rejection
escalates to the Playback failed overlay.

Browser test fakes the policy (reject first gesture-less play()) since
headless Chromium allows autoplay. Logs showed the shape of it: six
loads of the same ep, 38-40 segments each, all 200, player never started.

static/app.js

@@ -369,14 +369,14 @@ function stopHls() { if (hls) { hls.destroy(); hls = null; } }
 
 let currentEp = null, lastSavedPos = 0, playerBroken = false;
 
-function playerOverlay(text, onRetry) {
+function playerOverlay(text, onAction, actionLabel = "Retry") {
   const p = document.getElementById("player");
   let o = p.querySelector(".pl-overlay");
   if (!o) { o = el("div", "pl-overlay"); p.append(o); }
   o.replaceChildren(el("span", null, text));
-  if (onRetry) {
-    const b = el("button", "btn", "Retry");
-    b.onclick = onRetry;
+  if (onAction) {
+    const b = el("button", "btn", actionLabel);
+    b.onclick = onAction;
     o.append(b);
   }
 }
@@ -465,7 +465,12 @@ async function play(ep_id, ep_no) {
       if (currentEp && !playerBroken && !v.ended) playerOverlay("Buffering\u2026");
     });
     v.addEventListener("ended", onEnded);
-    v.play().catch(() => {});  // autoplay blocked -> user uses the native play button
+    // The overlay only clears on 'playing', so a blocked autoplay would leave
+    // "Loading…" parked over the (unreachable) native controls forever — the
+    // rejected play() is the signal to swap it for a tappable one.
+    v.play().catch(() => playerOverlay("Tap to play", () => {
+      v.play().catch(() => playerFail("playback blocked by the browser"));
+    }, "Play"));
     watchPos(v);
     postHistory({...meta(v), title: detail.name, slug_id: detail.slug_id, season_id: seasonId,
                  ep_id, lang, ep: ep_no, pos: saved?.pos || 0});