feat(settings): add global controller overlay scale & opacity settings

- Add `controllerScale` key (0.5–2.0, default 1.0) to PVSettings
- Apply `.scaleEffect()` and `.opacity()` to DefaultControllerSkinView
  for both portrait and landscape layouts
- Add "Controller Scale" slider to SwiftUI OnScreenControllerSection
- Add "Scale" slider to UIKit PVSettingsViewController

Part of #2889
Closes #2890

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: github-actions[bot]

PVSettings/Sources/PVSettings/Settings/Model/PVSettingsModel.swift

@@ -130,6 +130,9 @@ public extension Defaults.Keys {
     static let allRightShoulders = Key<Bool>("allRightShoulders", default: false)
 #endif
     static let controllerOpacity = Key<Double>("controllerOpacity", default: 0.8)
+    /// Scale multiplier for the on-screen controller overlay.
+    /// Range: 0.5 (half size) – 2.0 (double size). Default 1.0 (normal size).
+    static let controllerScale = Key<Double>("controllerScale", default: 1.0)
 
     static let pauseButtonIsMenuButton = Key<Bool>("pauseButtonIsMenuButton", default: false)
     static let hapticFeedback = Key<Bool>("hapticFeedback", default: true)

PVUI/Sources/PVSwiftUI/Settings/SettingsSwiftUI.swift

@@ -2375,6 +2375,7 @@ private struct TestRumbleButton: View {
 #if !os(tvOS)
 private struct OnScreenControllerSection: View {
     @Default(.controllerOpacity) var controllerOpacity
+    @Default(.controllerScale) var controllerScale
     @Default(.buttonTints) var buttonTints
     @Default(.allRightShoulders) var allRightShoulders
     @Default(.buttonVibration) var buttonVibration
@@ -2408,6 +2409,24 @@ private struct OnScreenControllerSection: View {
                                              .foregroundColor(RetroTheme.retroBlue)
                                      })
             }
+            HStack {
+                Text("Controller Scale")
+                RetroWaveSlider<Double>(value: $controllerScale,
+                                     in: 0.5...2.0,
+                                     step: 0.05,
+                                     onEditingChanged: { _ in },
+                                     label: { Text("Size of the on-screen controller overlay.") },
+                                     minimumValueLabel: { Text("") },
+                                     maximumValueLabel: { Text("") },
+                                     leadingIcon: {
+                                         Image(systemName: "minus.magnifyingglass")
+                                             .foregroundColor(RetroTheme.retroBlue)
+                                     },
+                                     trailingIcon: {
+                                         Image(systemName: "plus.magnifyingglass")
+                                             .foregroundColor(RetroTheme.retroBlue)
+                                     })
+            }
             ThemedToggle(isOn: $buttonTints) {
                 SettingsRow(title: "Button Colors",
                             subtitle: "Show colored buttons matching original hardware.",

PVUI/Sources/PVUIBase/Settings/PVSettingsViewController.swift

@@ -290,6 +290,11 @@ public final class PVSettingsViewController: QuickTableViewController {
                                                   valueLimits: (min: 0.0, max: 1.0),
                                                   valueImages: (.sfSymbol("sun.min"), .sfSymbol("sun.max")),
                                                   key: .controllerOpacity))
+        controllerRows.append(PVSettingsSliderRow(text: NSLocalizedString("Scale", comment: "Scale"),
+                                                  detailText: .subtitle("Size of the on-screen controller overlay."),
+                                                  valueLimits: (min: 0.5, max: 2.0),
+                                                  valueImages: (.sfSymbol("minus.magnifyingglass"), .sfSymbol("plus.magnifyingglass")),
+                                                  key: .controllerScale))
 
         controllerRows.append(contentsOf: [
             PVSettingsSwitchRow(text: NSLocalizedString("Button Colors", comment: "Button Colors"),

PVUI/Sources/PVUIBase/SwiftUI/DeltaSkins/Views/Display/EmulatorWithSkinView+DefaultSkin.swift

@@ -18,6 +18,7 @@ import PVThemes
 import PVLogging
 import PVUIBase
 import PVSettings
+import Defaults
 
 // MARK: - Retrowave Styling Components
 
@@ -179,6 +180,10 @@ struct DefaultControllerSkinView: View {
     // Bridge to protocol system (replaces notification system)
     @State private var viewportBridge: ViewportLayoutProviderBridge?
 
+    // User-configurable overlay scale and opacity
+    @Default(.controllerScale) private var controllerScale
+    @Default(.controllerOpacity) private var controllerOpacity
+
     init(useJoystick: Bool, inputHandler: DeltaSkinInputHandler, systemId: SystemIdentifier?, coreInstance: PVEmulatorCore) {
         self._useJoystickInternal = State(initialValue: useJoystick)
         self.inputHandler = inputHandler
@@ -231,6 +236,8 @@ struct DefaultControllerSkinView: View {
                     if isLandscape {
                         // Landscape layout - controls positioned at edges with safe area awareness
                         dynamicLandscapeControllerSkin
+                            .scaleEffect(controllerScale)
+                            .opacity(controllerOpacity)
                             .onAppear {
                                 loadControlLayoutData()
                                 // Ensure input handler has the core set
@@ -247,6 +254,8 @@ struct DefaultControllerSkinView: View {
 
                             // Controller area - constrained to bottom portion
                             dynamicControllerSkin
+                                .scaleEffect(controllerScale)
+                                .opacity(controllerOpacity)
                                 .frame(maxHeight: geometry.size.height * 0.35)
                                 .clipped()
                                 .onAppear {