ui: blend titlebars into player background

README.md

@@ -184,12 +184,14 @@ Terebi reports facts, not watched status. A consumer such as Tubular decides com
 
 ## Playback UI
 
-The layout follows [IINA's video-first window](https://iina.io/img/screenshot.png) and the supplied screenshots: a 32-point frosted titlebar with native traffic lights and file icon, plus a dark frosted 440 × 68-point floating controller. AppKit materials blur the video beneath the chrome; muted icons, an orange volume track, a narrow seek thumb, and zero-padded time labels follow the reference. Shared vertical padding and an optical offset for symbol/slider insets balance the controller's visible top and bottom margins in both play and pause states. The controller starts centered with a four-percent bottom inset and keeps its relative position when the window changes size.
+The layout follows [IINA's video-first window](https://iina.io/img/screenshot.png) and the supplied screenshots: a 32-point transparent titlebar with native traffic lights and file icon, plus a dark frosted 440 × 68-point floating controller. AppKit materials blur the video beneath the controller; muted icons, an orange volume track, a narrow seek thumb, and zero-padded time labels follow the reference. Shared vertical padding and an optical offset for symbol/slider insets balance the controller's visible top and bottom margins in both play and pause states. The controller starts centered with a four-percent bottom inset and keeps its relative position when the window changes size.
 
 The empty player uses the same HUD-glass material, 12-point rounded corners, and muted icon/text palette in a centered welcome card. File and YouTube opening actions share a consistently sized row; the card fits the 400 × 240-point minimum window, and the full window still accepts media-file and YouTube-link drops.
 
 With no media open, the full window uses native behind-window HUD glass to frost the desktop and windows beneath it. The idle Metal surface stays attached but hidden; opening media restores a solid black background and letterboxing, and closing it restores the frosted background. macOS controls the material’s appearance, including Reduce Transparency.
 
+Normal and compact titlebars have no separate glass strip or separator: content extends beneath AppKit’s transparent titlebar using `fullSizeContentView`, `titlebarAppearsTransparent`, and `titlebarSeparatorStyle = .none`. The title and pin sit directly over the existing background or video, with native traffic lights and window dragging preserved.
+
 Opening video fits the window to its display aspect ratio, including non-square pixels, and constrains subsequent window resizing. Fullscreen retains the normal letterboxed renderer; audio-only playback and close release the aspect constraint. Extreme ratios that cannot fit both the screen and usable controls keep a freely resizable letterboxed window.
 
 **Compact mode** uses the same window, Metal view, and playback session—not a second window or macOS system PiP. Use the PiP-shaped button in the normal playback controls, **⌃⌘P**, or **Playback Actions → Enter Compact Mode**. The compact-mode button replaces the fullscreen button; fullscreen remains available through its menu, keyboard shortcuts, and double-clicking normal-mode video. Compact mode starts at the current screen's top-right corner with a 16-point inset and a preferred width of 320 points, preserving display aspect where usable screen bounds and the 160 × 90-point minimum allow; extreme ratios retain letterboxing. Compact mode floats above ordinary windows, joins all Spaces, and is configured to join eligible other-app fullscreen spaces and Stage Manager sets. Small hover controls provide play/pause, restore, and Playback Actions; keyboard playback controls remain available.

Sources/App/TerebiApp.swift

@@ -998,7 +998,6 @@ final class PlayerModel: ObservableObject {
 
 @MainActor
 private struct PlayerGlass: NSViewRepresentable {
-    var titlebar = false
     var blendingMode: NSVisualEffectView.BlendingMode = .withinWindow
 
     func makeNSView(context: Context) -> NSVisualEffectView {
@@ -1006,7 +1005,7 @@ private struct PlayerGlass: NSViewRepresentable {
         view.blendingMode = blendingMode
         view.state = .active
         view.appearance = NSAppearance(named: .vibrantDark)
-        view.material = titlebar ? .titlebar : .hudWindow
+        view.material = .hudWindow
         return view
     }
 
@@ -1245,7 +1244,6 @@ private struct PlayerContent: View {
         .padding(.trailing, 12)
         .frame(height: 32)
         .foregroundStyle(.white.opacity(0.6))
-        .background(PlayerGlass(titlebar: true).allowsHitTesting(false))
         .onHover(perform: model.setTitleHovered)
         .opacity(model.controlsVisible ? 1 : 0)
         .allowsHitTesting(model.controlsVisible)
@@ -1500,7 +1498,6 @@ private struct PlayerContent: View {
                         .padding(8)
                         .frame(maxWidth: .infinity)
                         .foregroundStyle(.white.opacity(0.75))
-                        .background(PlayerGlass(titlebar: true))
                         .opacity(model.controlsVisible ? 1 : 0)
                         .allowsHitTesting(false)
                         .accessibilityHidden(!model.controlsVisible)
@@ -1617,6 +1614,7 @@ private struct WindowChrome: NSViewRepresentable {
             window.styleMask.insert(.fullSizeContentView)
             window.titleVisibility = .hidden
             window.titlebarAppearsTransparent = true
+            window.titlebarSeparatorStyle = .none
             window.isOpaque = false
             window.backgroundColor = .clear
             window.acceptsMouseMovedEvents = true