Remove dead code found by Periphery on all platforms

Delete declarations that Periphery reports unused on every platform that
compiles them (iOS, macOS, tvOS), including nine views used only by their
own previews. Platform-gated code still used on another platform, device-
only MPV render paths, migration models, CloudKit record names, App
Intents metadata and unused parameters are kept.

Yattee/Views/Player/ExpandedPlayerWindowManager.swift

@@ -660,30 +660,6 @@ final class ExpandedPlayerWindowManager: NSObject {
         LoggingService.shared.debug("ExpandedPlayerWindowManager: restored corner panels after fullscreen", category: .player)
     }
 
-    /// Restores a window that was hidden for PiP mode.
-    /// Call this when returning from PiP to show the player window again.
-    func restoreFromPiP(animated: Bool = true) {
-        guard let window = playerWindow else {
-            LoggingService.shared.debug("ExpandedPlayerWindowManager: restoreFromPiP - no window to restore", category: .player)
-            return
-        }
-
-        LoggingService.shared.debug("ExpandedPlayerWindowManager: restoreFromPiP called", category: .player)
-
-        if animated {
-            window.alphaValue = 0
-            window.makeKeyAndOrderFront(nil)
-            NSAnimationContext.runAnimationGroup { context in
-                context.duration = 0.25
-                context.timingFunction = CAMediaTimingFunction(name: .easeOut)
-                window.animator().alphaValue = 1
-            }
-        } else {
-            window.alphaValue = 1
-            window.makeKeyAndOrderFront(nil)
-        }
-    }
-
     /// Cleans up a window that was hidden for PiP when PiP ends without restoring.
     /// Call this when PiP is closed via the X button (not restore).
     func cleanupAfterPiP() {