Live-seek tvOS scrubber and auto-commit on idle

Throttle SELECT-based scrubbing to seek the underlying frame ~every
150ms instead of waiting 1s after pan-end, so the visible frame keeps
up with the scrub handle. Hide the redundant storyboard panel during
live scrub (the frame itself is now the preview) but keep the chapter
capsule visible. Storyboard panel still shown for D-pad arrow-seek
where the frame doesn't move until commit.

Auto-commit scrub mode after 3s of inactivity, matching
AVPlayerViewController behavior — playback resumes via the existing
scrub-pause wiring instead of staying paused indefinitely.

Yattee/Views/Player/tvOS/TVPlayerProgressBar.swift

@@ -160,10 +160,12 @@ struct TVPlayerProgressBar: View {
     private func enterScrubMode() {
         scrubTime = currentTime
         panAccumulator = 0
+        lastLiveSeekTime = nil
         withAnimation(.easeOut(duration: 0.15)) {
             isScrubbing = true
         }
         onScrubbingChanged?(true)
+        scheduleIdleAutoCommit()
     }
 
     private var progressContent: some View {
@@ -241,27 +243,35 @@ struct TVPlayerProgressBar: View {
 
     @ViewBuilder
     private func scrubPreviewOverlay(geometry: GeometryProxy) -> some View {
-        if isScrubbing || showArrowSeekPreview {
-            let seekTime = displayTime
-            let currentChapter = showChapters ? chapters.last(where: { $0.startTime <= seekTime }) : nil
-            // Storyboard panel is 320 thumbnail + 4pt horizontal padding * 2 = 328, plus shadow.
-            // Use a slightly larger clamp width so the shadow stays on screen.
-            let panelWidth: CGFloat = 344
-            // Panel height: thumbnail 180 + 4pt vertical padding * 2 = 188 (round up for shadow).
-            let panelHeight: CGFloat = 200
-            let capsuleSpacing: CGFloat = 8
-            // Approximate capsule height (24pt text + 6pt padding * 2 + shadow) — used only
-            // for vertical positioning, not for layout sizing.
-            let capsuleApproxHeight: CGFloat = 44
+        // Storyboard panel: only for arrow-seek (accumulator mode). During
+        // SELECT-based scrub we live-seek the underlying frame, so the
+        // storyboard would just duplicate what's already on screen.
+        // Chapter capsule: shown for either scrub mode — it conveys info the
+        // raw frame doesn't (chapter title) and stays useful during live seek.
+        let seekTime = displayTime
+        let currentChapter = showChapters ? chapters.last(where: { $0.startTime <= seekTime }) : nil
+        // Storyboard panel is 320 thumbnail + 4pt horizontal padding * 2 = 328, plus shadow.
+        // Use a slightly larger clamp width so the shadow stays on screen.
+        let panelWidth: CGFloat = 344
+        // Panel height: thumbnail 180 + 4pt vertical padding * 2 = 188 (round up for shadow).
+        let panelHeight: CGFloat = 200
+        let capsuleSpacing: CGFloat = 8
+        // Approximate capsule height (24pt text + 6pt padding * 2 + shadow) — used only
+        // for vertical positioning, not for layout sizing.
+        let capsuleApproxHeight: CGFloat = 44
 
-            let xTarget = geometry.size.width * progress
-            let halfPanel = panelWidth / 2
-            let clampedPanelX = max(halfPanel, min(geometry.size.width - halfPanel, xTarget))
-            let panelCenterY = -panelHeight / 2 - 16
-            let capsuleCenterY = -panelHeight - 16 - capsuleSpacing - capsuleApproxHeight / 2
+        let xTarget = geometry.size.width * progress
+        let halfPanel = panelWidth / 2
+        let clampedPanelX = max(halfPanel, min(geometry.size.width - halfPanel, xTarget))
+        let panelCenterY = -panelHeight / 2 - 16
+        // When the storyboard panel is hidden, place the capsule where the
+        // panel would have been so it doesn't float far above the bar.
+        let capsuleCenterY = showArrowSeekPreview
+            ? -panelHeight - 16 - capsuleSpacing - capsuleApproxHeight / 2
+            : -16 - capsuleApproxHeight / 2
 
-            ZStack {
-                // Storyboard panel — follows scrub handle, tight horizontal clamp.
+        ZStack {
+            if showArrowSeekPreview {
                 Group {
                     if let storyboard {
                         TVSeekPreviewView(
@@ -283,18 +293,17 @@ struct TVPlayerProgressBar: View {
                 }
                 .fixedSize()
                 .position(x: clampedPanelX, y: panelCenterY)
-
-                // Chapter capsule — sized to its title (up to screen width minus margin),
-                // positioned to follow the scrub handle and clamped to stay on screen.
-                if let currentChapter {
-                    TVChapterCapsuleView(title: currentChapter.title)
-                        .positioned(xTarget: xTarget, availableWidth: geometry.size.width)
-                        .position(x: geometry.size.width / 2, y: capsuleCenterY)
-                }
+                .transition(.scale.combined(with: .opacity))
+            }
+
+            if (isScrubbing || showArrowSeekPreview), let currentChapter {
+                TVChapterCapsuleView(title: currentChapter.title)
+                    .positioned(xTarget: xTarget, availableWidth: geometry.size.width)
+                    .position(x: geometry.size.width / 2, y: capsuleCenterY)
+                    .transition(.opacity)
             }
-            .transition(.scale.combined(with: .opacity))
-            .allowsHitTesting(false)
         }
+        .allowsHitTesting(false)
     }
 
     // MARK: - Pan Gesture Handling
@@ -302,8 +311,7 @@ struct TVPlayerProgressBar: View {
     private func handlePan(translation: CGFloat, velocity: CGFloat) {
         guard duration > 0, isScrubbing else { return }
 
-        // Cancel any pending seek when user starts new pan
-        seekTask?.cancel()
+        scheduleIdleAutoCommit()
 
         // Calculate scrub sensitivity based on duration
         // Lower values = slower/finer scrubbing
@@ -328,23 +336,44 @@ struct TVPlayerProgressBar: View {
         let timeChange = TimeInterval(delta * adjustedSensitivity)
         let currentScrubTime = scrubTime ?? currentTime
         scrubTime = min(max(0, currentScrubTime + timeChange), duration)
+
+        scheduleLiveSeek()
     }
 
     private func handlePanEnded() {
         // Reset accumulator for next swipe
         panAccumulator = 0
-        // Schedule debounced seek but stay in scrub mode
-        scheduleSeek()
+        // Flush any pending throttled seek so the underlying frame catches up
+        // immediately when the user lifts their finger.
+        flushLiveSeek()
+        scheduleIdleAutoCommit()
     }
 
     @State private var seekTask: Task<Void, Never>?
+    @State private var lastLiveSeekTime: Date?
 
-    private func scheduleSeek() {
-        seekTask?.cancel()
-        seekTask = Task {
-            try? await Task.sleep(for: .milliseconds(1000))
-            guard !Task.isCancelled else { return }
-            await MainActor.run {
+    /// Live-seek throttle: ~150ms leading + trailing.
+    /// Keeps the underlying frame in sync with the storyboard preview while
+    /// scrubbing without flooding the backend with seek calls.
+    private func scheduleLiveSeek() {
+        let interval: TimeInterval = 0.15
+        let now = Date()
+        let elapsed = lastLiveSeekTime.map { now.timeIntervalSince($0) } ?? .infinity
+
+        if elapsed >= interval {
+            seekTask?.cancel()
+            seekTask = nil
+            lastLiveSeekTime = now
+            if let time = scrubTime {
+                onSeek(time)
+            }
+        } else if seekTask == nil {
+            let delay = interval - elapsed
+            seekTask = Task { @MainActor in
+                try? await Task.sleep(for: .seconds(delay))
+                guard !Task.isCancelled else { return }
+                seekTask = nil
+                lastLiveSeekTime = Date()
                 if let time = scrubTime {
                     onSeek(time)
                 }
@@ -352,6 +381,35 @@ struct TVPlayerProgressBar: View {
         }
     }
 
+    private func flushLiveSeek() {
+        seekTask?.cancel()
+        seekTask = nil
+        lastLiveSeekTime = Date()
+        if let time = scrubTime {
+            onSeek(time)
+        }
+    }
+
+    // MARK: - Idle auto-commit
+
+    /// Auto-commit timer: AVPlayerViewController commits scrub mode after a
+    /// few seconds of inactivity so playback can resume.
+    @State private var idleAutoCommitTask: Task<Void, Never>?
+
+    private func scheduleIdleAutoCommit() {
+        idleAutoCommitTask?.cancel()
+        idleAutoCommitTask = Task { @MainActor in
+            try? await Task.sleep(for: .seconds(3))
+            guard !Task.isCancelled, isScrubbing else { return }
+            commitScrub()
+        }
+    }
+
+    private func cancelIdleAutoCommit() {
+        idleAutoCommitTask?.cancel()
+        idleAutoCommitTask = nil
+    }
+
     // MARK: - D-Pad Fallback
 
     private func handleDPad(direction: MoveCommandDirection) {
@@ -395,7 +453,8 @@ struct TVPlayerProgressBar: View {
             } else {
                 scrubTime = min(duration, currentScrubTime + scrubAmount)
             }
-            scheduleSeek()
+            scheduleLiveSeek()
+            scheduleIdleAutoCommit()
 
         case .up, .down:
             // Exit scrub mode and let navigation happen
@@ -414,6 +473,7 @@ struct TVPlayerProgressBar: View {
     private func commitScrub() {
         seekTask?.cancel()
         seekTask = nil
+        cancelIdleAutoCommit()
 
         let wasScrubbing = isScrubbing
 
@@ -430,6 +490,7 @@ struct TVPlayerProgressBar: View {
         dpadStreakCount = 0
         lastDPadTime = nil
         lastDPadDirection = nil
+        lastLiveSeekTime = nil
         arrowSeekPreviewHideTask?.cancel()
         arrowSeekPreviewHideTask = nil
 
@@ -441,6 +502,7 @@ struct TVPlayerProgressBar: View {
     private func cancelScrub() {
         seekTask?.cancel()
         seekTask = nil
+        cancelIdleAutoCommit()
 
         let wasScrubbing = isScrubbing
 
@@ -453,6 +515,7 @@ struct TVPlayerProgressBar: View {
         dpadStreakCount = 0
         lastDPadTime = nil
         lastDPadDirection = nil
+        lastLiveSeekTime = nil
         arrowSeekPreviewHideTask?.cancel()
         arrowSeekPreviewHideTask = nil