refactor(video-player): LTR timeline, unified buffer/progress layers, controls layout, remove ambient

- timeline: unified dir="ltr" container; buffer and progress as stacked absolute fills in correct z-order
- playhead: physical left property instead of insetInlineStart (fixes RTL mirroring)
- control bar: dir="ltr" explicit groups — left: play/rewind/volume/speed, right: theater/fullscreen
- rewind: replace flipped SkipBack with Rewind icon; seek indicator at physical right-8
- ambient effect: removed entirely (canvas, rAF loop, state, constants, toggle)
- settings menu: removed (speed accessible via pill; ambient gone)
- restart button: removed

frontend/src/components/video-player.tsx

@@ -10,13 +10,10 @@ import {
   Minimize,
   Pause,
   Play,
-  RotateCcw,
-  Settings,
-  SkipBack,
+  Rewind,
   Volume1,
   Volume2,
   VolumeX,
-  Zap,
 } from "lucide-react";
 import { motion, AnimatePresence } from "framer-motion";
 import type Hls from "hls.js";
@@ -35,8 +32,6 @@ const CONTINUOUS_PLAY_MAX_DT = 3;
 const ALLOWED_SPEEDS = [0.5, 0.75, 1, 1.25, 1.5, 2] as const;
 type Speed = (typeof ALLOWED_SPEEDS)[number];
 const MAX_RETRY_DELAY_MS = 30_000;
-const AMBIENT_FPS = 8;
-const AMBIENT_INTERVAL = 1000 / AMBIENT_FPS;
 const DOUBLE_TAP_MS = 300;
 const DOUBLE_TAP_SLOP = 60;
 
@@ -54,7 +49,6 @@ function writeStorage(key: string, value: unknown) {
 }
 
 const isNumber = (v: unknown): v is number => typeof v === "number" && Number.isFinite(v);
-const isBoolean = (v: unknown): v is boolean => typeof v === "boolean";
 
 // ─── Main Component ───────────────────────────────────────────────────────────
 export function VideoPlayer({
@@ -73,9 +67,6 @@ export function VideoPlayer({
   // ── Refs ────────────────────────────────────────────────────────────────────
   const videoRef = useRef<HTMLVideoElement>(null);
   const containerRef = useRef<HTMLDivElement>(null);
-  const ambientCanvasRef = useRef<HTMLCanvasElement>(null);
-  const ambientRafRef = useRef(0);
-  const ambientLastTickRef = useRef(0);
   const hlsRef = useRef<Hls | null>(null);
 
   const lockedSrcRef = useRef(videoUrl);
@@ -98,7 +89,6 @@ export function VideoPlayer({
 
   // ── Persisted prefs ─────────────────────────────────────────────────────────
   const [volume, setVolume] = useState(() => readStorage("pargar:volume", 1, isNumber));
-  const [ambientMode, setAmbientMode] = useState(() => readStorage("pargar:ambient", true, isBoolean));
   const [speed, setSpeed] = useState<Speed>(() => {
     const s = readStorage("pargar:speed", 1, isNumber);
     return (ALLOWED_SPEEDS as readonly number[]).includes(s) ? s as Speed : 1;
@@ -121,12 +111,9 @@ export function VideoPlayer({
   const [mediaDuration, setMediaDuration] = useState(duration);
   const [fullscreen, setFullscreen] = useState(false);
   const [theaterMode, setTheaterMode] = useState(false);
-  const [settingsOpen, setSettingsOpen] = useState(false);
   const [seekIndicator, setSeekIndicator] = useState<"back" | null>(null);
 
   const hideTimer = useRef<number | null>(null);
-  const settingsPanelRef = useRef<HTMLDivElement>(null);
-  const settingsBtnRef = useRef<HTMLButtonElement>(null);
 
   // ── Utilities ───────────────────────────────────────────────────────────────
   const warnSeekBlocked = useCallback(() => {
@@ -209,12 +196,6 @@ export function VideoPlayer({
     changeSpeed(next);
   }, [changeSpeed]);
 
-  const toggleAmbient = useCallback(() => {
-    setAmbientMode((prev) => {
-      writeStorage("pargar:ambient", !prev);
-      return !prev;
-    });
-  }, []);
 
   // ── HLS init ────────────────────────────────────────────────────────────────
   useEffect(() => {
@@ -445,25 +426,6 @@ export function VideoPlayer({
     return () => document.removeEventListener("fullscreenchange", onFsChange);
   }, []);
 
-  // ── Ambient mode rAF loop ───────────────────────────────────────────────────
-  useEffect(() => {
-    if (!ambientMode) { cancelAnimationFrame(ambientRafRef.current); return; }
-    const tick = (now: DOMHighResTimeStamp) => {
-      ambientRafRef.current = requestAnimationFrame(tick);
-      if (now - ambientLastTickRef.current < AMBIENT_INTERVAL) return;
-      ambientLastTickRef.current = now;
-      const v = videoRef.current;
-      const canvas = ambientCanvasRef.current;
-      if (!v || !canvas || v.readyState < 2 || v.paused) return;
-      try {
-        const ctx = canvas.getContext("2d");
-        if (ctx) ctx.drawImage(v, 0, 0, canvas.width, canvas.height);
-      } catch { setAmbientMode(false); } // CORS taint
-    };
-    ambientRafRef.current = requestAnimationFrame(tick);
-    return () => cancelAnimationFrame(ambientRafRef.current);
-  }, [ambientMode, playing]);
-
   // ── Keyboard shortcuts ──────────────────────────────────────────────────────
   useEffect(() => {
     const onKey = (e: KeyboardEvent) => {
@@ -492,19 +454,6 @@ export function VideoPlayer({
     return () => window.removeEventListener("keydown", onKey);
   }, [toggle, skipBack, warnSeekBlocked, poke, toggleFullscreen]);
 
-  // ── Settings click-outside close ────────────────────────────────────────────
-  useEffect(() => {
-    if (!settingsOpen) return;
-    const onMouseDown = (e: MouseEvent) => {
-      const target = e.target as Node;
-      if (settingsPanelRef.current?.contains(target)) return;
-      if (settingsBtnRef.current?.contains(target)) return;
-      setSettingsOpen(false);
-    };
-    document.addEventListener("mousedown", onMouseDown);
-    return () => document.removeEventListener("mousedown", onMouseDown);
-  }, [settingsOpen]);
-
   // ── Cleanup timers ──────────────────────────────────────────────────────────
   useEffect(() => {
     return () => {
@@ -611,8 +560,8 @@ export function VideoPlayer({
     <div
       className={cn(
         "space-y-4",
-        // Theater mode: break out of the page's max-w container with a full-bleed trick
-        theaterMode && "relative left-1/2 right-1/2 -mx-[50vw] w-screen",
+        // Theater mode: on mobile remove page padding; on sm+ break out to full-bleed
+        theaterMode && "max-sm:-mx-4 max-sm:w-[calc(100%+2rem)] sm:relative sm:left-1/2 sm:right-1/2 sm:-mx-[50vw] sm:w-screen",
       )}
     >
       {/* ── Player container ─── */}
@@ -627,24 +576,6 @@ export function VideoPlayer({
         onMouseMove={poke}
         onPointerDown={handlePointerDown}
       >
-        {/* Ambient canvas (behind video) */}
-        <div className="pointer-events-none absolute inset-0 z-0 overflow-hidden" aria-hidden>
-          <canvas
-            ref={ambientCanvasRef}
-            width={32}
-            height={18}
-            className={cn(
-              "absolute inset-[-15%] h-[130%] w-[130%] transition-opacity duration-1000",
-              ambientMode && playing ? "opacity-100" : "opacity-0",
-            )}
-            style={{
-              filter: "blur(55px) saturate(1.4)",
-              transform: "translate3d(0,0,0)",
-              willChange: "filter, transform",
-            }}
-          />
-        </div>
-
         {/* Video element */}
         <video
           ref={videoRef}
@@ -716,7 +647,7 @@ export function VideoPlayer({
           </AnimatePresence>
         </div>
 
-        {/* Seek indicator (double-tap feedback) */}
+        {/* Seek indicator (rewind feedback — physical right side) */}
         <AnimatePresence>
           {seekIndicator && (
             <motion.div
@@ -724,10 +655,10 @@ export function VideoPlayer({
               initial={{ opacity: 0, scale: 0.7 }}
               animate={{ opacity: 1, scale: 1 }}
               exit={{ opacity: 0, scale: 0.7 }}
-              className="pointer-events-none absolute start-8 top-1/2 z-30 flex -translate-y-1/2 flex-col items-center gap-1"
+              className="pointer-events-none absolute right-8 top-1/2 z-30 flex -translate-y-1/2 flex-col items-center gap-1"
             >
               <div className="flex h-12 w-12 items-center justify-center rounded-full bg-white/20 backdrop-blur-sm">
-                <SkipBack className="h-6 w-6 text-white" />
+                <Rewind className="h-6 w-6 text-white" />
               </div>
               <span className="text-xs font-bold text-white drop-shadow">۱۰ ثانیه</span>
             </motion.div>
@@ -749,159 +680,91 @@ export function VideoPlayer({
             <span className="ms-auto tabular-nums">{fmt(position)} / {fmt(mediaDuration)}</span>
           </div>
 
-          {/* Progress bar with hover tooltip */}
+          {/* Timeline — unified dir="ltr" coordinate space */}
           <div
-            className="relative mx-4 cursor-pointer"
+            dir="ltr"
+            className="relative mx-4 cursor-pointer py-2"
             onMouseMove={onProgressHover}
             onMouseLeave={() => setHoverTime(null)}
           >
             {/* Hover timestamp tooltip */}
             {hoverTime !== null && (
               <div
-                className="pointer-events-none absolute -top-8 z-10 rounded bg-black/80 px-1.5 py-0.5 text-[11px] font-bold text-white"
+                className="pointer-events-none absolute -top-6 z-10 rounded bg-black/80 px-1.5 py-0.5 text-[11px] font-bold text-white"
                 style={{ left: `${hoverX}px`, transform: "translateX(-50%)" }}
               >
                 {fmt(hoverTime)}
               </div>
             )}
-            {/* Buffer track */}
-            <div className="absolute inset-0 overflow-hidden rounded-full">
+            {/* Track layers stacked bottom-to-top: base → buffer → progress → thumb */}
+            <div className="relative h-2 overflow-hidden rounded-full bg-white/10">
+              {/* Buffer layer */}
               <div
-                className="h-full rounded-full bg-white/20 transition-[width] duration-300"
+                className="absolute left-0 top-0 h-full rounded-full bg-white/25 transition-[width] duration-300"
                 style={{ width: `${bufferedPct}%` }}
               />
-            </div>
-            <Progress value={pct} className="h-2 bg-white/10" gradient />
-            {/* Playhead thumb */}
+              {/* Play progress layer */}
               <div
-              className="pointer-events-none absolute top-1/2 h-4 w-4 -translate-y-1/2 rounded-full bg-white shadow-md transition-[inset-inline-start] duration-150"
-              style={{ insetInlineStart: `calc(${pct}% - 8px)` }}
+                className="absolute left-0 top-0 h-full rounded-full bg-primary transition-[width] duration-150"
+                style={{ width: `${pct}%` }}
+              />
+            </div>
+            {/* Playhead thumb — positioned outside overflow:hidden, same dir="ltr" space */}
+            <div
+              className="pointer-events-none absolute top-1/2 h-4 w-4 -translate-y-1/2 rounded-full bg-white shadow-md transition-[left] duration-150"
+              style={{ left: `calc(${pct}% - 8px)` }}
             />
           </div>
 
-          {/* Bottom control row */}
-          <div className="mt-3 flex flex-wrap items-center gap-1.5 px-4 pb-3">
+          {/* Bottom control row — dir="ltr" for physical left→right placement */}
+          <div dir="ltr" className="mt-1 flex items-center justify-between gap-1 px-4 pb-3">
+            {/* Left group: playback controls + volume + speed */}
+            <div className="flex items-center gap-1">
               {/* Play/Pause */}
-            <button type="button" onClick={toggle} className="rounded-full bg-white/10 p-2.5 text-white transition hover:bg-white/20 min-w-[44px] min-h-[44px] flex items-center justify-center" aria-label="پخش / توقف (Space)">
+              <button type="button" onClick={toggle} className="flex min-h-[44px] min-w-[44px] items-center justify-center rounded-full bg-white/10 p-2.5 text-white transition hover:bg-white/20" aria-label="پخش / توقف (Space)">
                 {playing ? <Pause className="h-5 w-5" /> : <Play className="h-5 w-5" />}
               </button>
 
-            {/* Skip back */}
-            <button type="button" onClick={() => { skipBack(); setSeekIndicator("back"); setTimeout(() => setSeekIndicator(null), 700); }} className="rounded-full bg-white/10 p-2.5 text-white transition hover:bg-white/20 min-w-[44px] min-h-[44px] flex items-center justify-center" aria-label="بازگشت ۱۰ ثانیه (J)" title="۱۰ ثانیه عقب (J/←)">
-              <SkipBack className="h-5 w-5 scale-x-[-1]" />
-            </button>
-
-            {/* Restart */}
-            <button type="button" onClick={() => { flushAcc(); seekProgrammatic(0); void videoRef.current?.play().catch(() => undefined); poke(); }} className="inline-flex items-center gap-1.5 rounded-full bg-white/10 px-3 py-2 text-xs font-bold text-white transition hover:bg-white/20 min-h-[44px]" aria-label="شروع از اول">
-              <RotateCcw className="h-4 w-4" />
-              <span className="hidden sm:inline">شروع از اول</span>
+              {/* Rewind 10s */}
+              <button type="button" onClick={() => { skipBack(); setSeekIndicator("back"); setTimeout(() => setSeekIndicator(null), 700); }} className="flex min-h-[44px] min-w-[44px] items-center justify-center rounded-full bg-white/10 p-2.5 text-white transition hover:bg-white/20" aria-label="بازگشت ۱۰ ثانیه (J)" title="۱۰ ثانیه عقب (J/←)">
+                <Rewind className="h-5 w-5" />
               </button>
 
               {/* Volume */}
-            <div className="flex items-center gap-1.5">
-              <button type="button" onClick={() => setMuted((m) => !m)} className="rounded-full bg-white/10 p-2.5 text-white transition hover:bg-white/20 min-w-[44px] min-h-[44px] flex items-center justify-center" aria-label="قطع صدا (M)" title="قطع/وصل صدا (M)">
+              <button type="button" onClick={() => setMuted((m) => !m)} className="flex min-h-[44px] min-w-[44px] items-center justify-center rounded-full bg-white/10 p-2.5 text-white transition hover:bg-white/20" aria-label="قطع صدا (M)" title="قطع/وصل صدا (M)">
                 <VolumeIcon className="h-5 w-5" />
               </button>
-              <input type="range" min={0} max={1} step={0.05} value={muted ? 0 : volume} onChange={(e) => { const v = parseFloat(e.target.value); setVolume(v); if (v > 0 && muted) setMuted(false); }} className="h-1 w-16 cursor-pointer accent-white opacity-80 hover:opacity-100" aria-label="میزان صدا" />
-            </div>
+              <input type="range" min={0} max={1} step={0.05} value={muted ? 0 : volume} onChange={(e) => { const v = parseFloat(e.target.value); setVolume(v); if (v > 0 && muted) setMuted(false); }} className="hidden h-1 w-16 cursor-pointer accent-white opacity-80 hover:opacity-100 sm:block" aria-label="میزان صدا" />
 
-            {/* Speed pill — click cycles through speeds */}
+              {/* Speed pill */}
               <button
                 type="button"
                 onClick={cycleSpeed}
                 title={`سرعت پخش: ${speed}× — کلیک برای تغییر`}
-              className="inline-flex items-center gap-1 rounded-full bg-white/10 px-2.5 py-2 text-xs font-bold text-white transition hover:bg-white/20 min-h-[44px]"
+                className="inline-flex min-h-[44px] items-center gap-1 rounded-full bg-white/10 px-2.5 py-2 text-xs font-bold text-white transition hover:bg-white/20"
               >
                 <Gauge className="h-4 w-4" />
                 <span>{speed}×</span>
               </button>
+            </div>
 
-            {/* Spacer */}
-            <span className="flex-1" />
-
-            {/* Watched pct */}
+            {/* Right group: watched%, theater, fullscreen */}
+            <div className="flex items-center gap-1">
               <span className="hidden text-xs text-white/70 sm:inline">{Math.round(watchedPct)}٪</span>
 
-            {/* Settings gear — opens ambient / global settings only */}
-            <button
-              ref={settingsBtnRef}
-              type="button"
-              onClick={() => setSettingsOpen((o) => !o)}
-              className="rounded-full bg-white/10 p-2.5 text-white transition hover:bg-white/20 min-w-[44px] min-h-[44px] flex items-center justify-center"
-              title="تنظیمات پخش"
-              aria-expanded={settingsOpen}
-            >
-              <Settings className={cn("h-5 w-5 transition-transform duration-200", settingsOpen && "rotate-45")} />
-            </button>
-
               {/* Theater mode */}
-            <button type="button" onClick={() => setTheaterMode((t) => !t)} className="hidden rounded-full bg-white/10 p-2.5 text-white transition hover:bg-white/20 min-w-[44px] min-h-[44px] sm:flex items-center justify-center" title="حالت تئاتر">
+              <button type="button" onClick={() => setTheaterMode((t) => !t)} className="hidden min-h-[44px] min-w-[44px] items-center justify-center rounded-full bg-white/10 p-2.5 text-white transition hover:bg-white/20 sm:flex" title="حالت تئاتر">
                 <ChevronDown className={cn("h-5 w-5 transition-transform", theaterMode && "rotate-180")} />
               </button>
 
               {/* Fullscreen */}
-            <button type="button" onClick={toggleFullscreen} className="rounded-full bg-white/10 p-2.5 text-white transition hover:bg-white/20 min-w-[44px] min-h-[44px] flex items-center justify-center" aria-label="تمام‌صفحه (F)" title="تمام‌صفحه (F)">
+              <button type="button" onClick={toggleFullscreen} className="flex min-h-[44px] min-w-[44px] items-center justify-center rounded-full bg-white/10 p-2.5 text-white transition hover:bg-white/20" aria-label="تمام‌صفحه (F)" title="تمام‌صفحه (F)">
                 {fullscreen ? <Minimize className="h-5 w-5" /> : <Maximize className="h-5 w-5" />}
               </button>
             </div>
           </div>
-
-        {/* Settings flyout — anchored above the controls bar, closes only on outside click */}
-        <AnimatePresence>
-          {settingsOpen && (
-            <motion.div
-              ref={settingsPanelRef}
-              key="settings"
-              initial={{ opacity: 0, y: 6, scale: 0.97 }}
-              animate={{ opacity: 1, y: 0, scale: 1 }}
-              exit={{ opacity: 0, y: 6, scale: 0.97 }}
-              transition={{ duration: 0.13 }}
-              className="absolute bottom-[4.5rem] end-3 z-40 min-w-[200px] rounded-xl border border-white/10 bg-neutral-900/95 p-2 text-sm text-white shadow-xl backdrop-blur-md"
-              onPointerDown={(e) => e.stopPropagation()}
-            >
-              <p className="mb-1.5 px-2 text-[10px] font-bold uppercase tracking-widest text-white/40">تنظیمات پخش</p>
-
-              {/* Speed picker (full grid) */}
-              <p className="mb-1 px-2 text-[11px] font-semibold text-white/60">سرعت</p>
-              <div className="mb-2 grid grid-cols-3 gap-1">
-                {ALLOWED_SPEEDS.map((s) => (
-                  <button
-                    key={s}
-                    type="button"
-                    onClick={() => { changeSpeed(s); setSettingsOpen(false); }}
-                    className={cn(
-                      "rounded-lg py-1.5 text-xs font-bold transition-colors",
-                      speed === s
-                        ? "bg-primary text-primary-foreground"
-                        : "bg-white/10 hover:bg-white/20",
-                    )}
-                  >
-                    {s}×
-                  </button>
-                ))}
         </div>
 
-              <div className="my-1.5 border-t border-white/10" />
-
-              {/* Ambient toggle */}
-              <button
-                type="button"
-                onClick={toggleAmbient}
-                className={cn(
-                  "flex w-full items-center gap-2 rounded-lg px-2 py-2 text-xs font-bold transition-colors",
-                  ambientMode ? "bg-primary/20 text-primary" : "hover:bg-white/10",
-                )}
-              >
-                <Zap className="h-4 w-4 shrink-0" />
-                <span>حالت محیطی</span>
-                <span className={cn("ms-auto text-[10px]", ambientMode ? "text-primary" : "text-white/40")}>
-                  {ambientMode ? "فعال" : "غیرفعال"}
-                </span>
-              </button>
-            </motion.div>
-          )}
-        </AnimatePresence>
-
         {/* Quiz unlock CTA */}
         <AnimatePresence>
           {quizUnlockedNow && (
@@ -933,7 +796,7 @@ export function VideoPlayer({
         </div>
         <div className="w-40 shrink-0">
           <Progress value={watchedPct} gradient smooth />
-          <p className="mt-1 text-end text-xs text-muted-foreground">{Math.round(watchedPct)}٪</p>
+          <p className="mt-1 text-right text-xs text-muted-foreground">{Math.round(watchedPct)}٪</p>
         </div>
         {quizUnlocked ? (
           <Button asChild variant="gradient">