Autoplay: playsinline + non-fatal tap-to-play fallback

videoEl() lacked playsinline: on iOS Safari (and some Android browsers)
v.play() then rejects with NotAllowedError even on the first,
gesture-backed attempt.

A tap on the 'Tap to play' overlay that is STILL rejected (e.g. the user
has autoplay disallowed for the site) no longer goes to the fatal
'Playback failed: playback blocked by the browser' screen whose Retry
just re-ran play() into the same wall. It stays on the tappable overlay
with a hint to allow autoplay in the site settings.

static/app.js

@@ -609,7 +609,7 @@ function stepEp(d) {
 
 function videoEl() {
   const v = document.createElement("video");
-  v.controls = true; v.autoplay = true;
+  v.controls = true; v.autoplay = true; v.playsinline = true;
   return v;
 }
 
@@ -727,9 +727,15 @@ async function play(ep_id, ep_no) {
     // hls.js fatal-error path — leave its overlay alone.
     v.play().catch(err => {
       if (!err || err.name !== "NotAllowedError") return;
-      playerOverlay("Tap to play", () => {
-        v.play().catch(() => playerFail("playback blocked by the browser"));
-      }, "Play");
+      // Not fatal: a tap (a real gesture) usually starts playback. If the
+      // browser rejects even that (autoplay disallowed for the site, …),
+      // stay on the tappable overlay and say what to change — retrying
+      // play() would just hit the same wall
+      const tap = () => v.play().catch(() => blocked());
+      const blocked = () => playerOverlay(
+        "Browser blocked playback. Tap Play, or allow autoplay for this " +
+        "site in the browser's site settings", tap, "Play");
+      blocked();
     });
     watchPos(v);
     postHistory({...meta(v), title: detail.name, slug_id: detail.slug_id, season_id: seasonId,