Style titlebar icons white with hover; allow Downloads in sandbox

- Add TitlebarIconButton for white tints, hover background, and toggle
  states without system blue; borderless with rounded layer feedback.
- Grant com.apple.security.files.downloads.read-write so Open Downloads
  works under App Sandbox.

Made-with: Cursor

google_apps/InAppBrowserWindow.swift

@@ -1,6 +1,85 @@
 import AppKit
 import WebKit
 
+/// Titlebar icon control: white/neutral tint (no accent blue), subtle hover and selected backgrounds.
+private final class TitlebarIconButton: NSButton {
+    private var isHovering = false
+    var isToggleActive = false
+
+    override func awakeFromNib() {
+        super.awakeFromNib()
+        commonInit()
+    }
+
+    override init(frame frameRect: NSRect) {
+        super.init(frame: frameRect)
+        commonInit()
+    }
+
+    @available(*, unavailable)
+    required init?(coder: NSCoder) {
+        nil
+    }
+
+    private func commonInit() {
+        wantsLayer = true
+        layer?.cornerRadius = 5
+        layer?.masksToBounds = true
+    }
+
+    override func updateTrackingAreas() {
+        super.updateTrackingAreas()
+        trackingAreas.forEach { removeTrackingArea($0) }
+        addTrackingArea(NSTrackingArea(
+            rect: bounds,
+            options: [.activeInKeyWindow, .mouseEnteredAndExited, .inVisibleRect],
+            owner: self,
+            userInfo: nil
+        ))
+    }
+
+    override func mouseEntered(with event: NSEvent) {
+        isHovering = true
+        refreshVisuals()
+    }
+
+    override func mouseExited(with event: NSEvent) {
+        isHovering = false
+        refreshVisuals()
+    }
+
+    override var isEnabled: Bool {
+        didSet { refreshVisuals() }
+    }
+
+    func setToggleActive(_ on: Bool) {
+        isToggleActive = on
+        refreshVisuals()
+    }
+
+    func refreshVisuals() {
+        let white = NSColor.white
+        if !isEnabled {
+            contentTintColor = white.withAlphaComponent(0.35)
+            layer?.backgroundColor = NSColor.clear.cgColor
+            return
+        }
+        if isToggleActive {
+            contentTintColor = white
+            let bg = isHovering ? white.withAlphaComponent(0.22) : white.withAlphaComponent(0.16)
+            layer?.backgroundColor = bg.cgColor
+            return
+        }
+        if isHovering {
+            contentTintColor = white
+            layer?.backgroundColor = white.withAlphaComponent(0.12).cgColor
+        } else {
+            contentTintColor = white.withAlphaComponent(0.88)
+            layer?.backgroundColor = NSColor.clear.cgColor
+        }
+    }
+}
+
 final class InAppBrowserWindowManager {
     static let shared = InAppBrowserWindowManager()
 
@@ -28,29 +107,24 @@ final class InAppBrowserWindowController: NSWindowController, NSWindowDelegate {
     private var didLoadInitialURL = false
 
     // Titlebar controls
-    private var backButton: NSButton!
-    private var forwardButton: NSButton!
-    private var reloadButton: NSButton!
-    private var pinButton: NSButton!
-    private var homeButton: NSButton!
-    private var gridButton: NSButton!
-    private var openInBrowserButton: NSButton!
-    private var handButton: NSButton!
-    private var downloadButton: NSButton!
-    private var moreButton: NSButton!
+    private var backButton: TitlebarIconButton!
+    private var forwardButton: TitlebarIconButton!
+    private var reloadButton: TitlebarIconButton!
+    private var pinButton: TitlebarIconButton!
+    private var homeButton: TitlebarIconButton!
+    private var gridButton: TitlebarIconButton!
+    private var openInBrowserButton: TitlebarIconButton!
+    private var handButton: TitlebarIconButton!
+    private var downloadButton: TitlebarIconButton!
+    private var moreButton: TitlebarIconButton!
     private var siteNameLabel: NSTextField!
     private var siteIconView: NSImageView!
     private var currentSiteIconURLKey: String?
     private var isPinnedOnTop = false
     private var isGestureModeEnabled = true
 
-    private func setToggledStyle(_ button: NSButton, isOn: Bool) {
-        // Native-ish “selected” look using tint + filled variant when available.
-        if isOn {
-            button.contentTintColor = .systemBlue
-        } else {
-            button.contentTintColor = nil
-        }
+    private func setToggledStyle(_ button: TitlebarIconButton, isOn: Bool) {
+        button.setToggleActive(isOn)
     }
 
     init(initialURL: URL, windowTitle: String?) {
@@ -78,16 +152,16 @@ final class InAppBrowserWindowController: NSWindowController, NSWindowDelegate {
         containerView.layer?.backgroundColor = NSColor.clear.cgColor
         window.contentView = containerView
 
-        func makeIconButton(symbolName: String, accessibility: String, action: Selector, fallbackSymbolName: String? = nil) -> NSButton {
-            let button = NSButton()
+        func makeIconButton(symbolName: String, accessibility: String, action: Selector, fallbackSymbolName: String? = nil) -> TitlebarIconButton {
+            let button = TitlebarIconButton()
             let primary = NSImage(systemSymbolName: symbolName, accessibilityDescription: accessibility)
             let fallback = fallbackSymbolName.flatMap { NSImage(systemSymbolName: $0, accessibilityDescription: accessibility) }
             button.image = primary ?? fallback
             button.image?.isTemplate = true
             button.imagePosition = .imageOnly
             button.imageScaling = .scaleProportionallyDown
-            button.isBordered = true
-            button.bezelStyle = .texturedRounded
+            button.isBordered = false
+            button.bezelStyle = .regularSquare
             button.controlSize = .small
             button.font = NSFont.systemFont(ofSize: 12, weight: .semibold)
             button.setButtonType(.momentaryPushIn)
@@ -101,6 +175,7 @@ final class InAppBrowserWindowController: NSWindowController, NSWindowDelegate {
             // Consistent symbol sizing.
             let cfg = NSImage.SymbolConfiguration(pointSize: 12, weight: .semibold)
             button.image = button.image?.withSymbolConfiguration(cfg)
+            button.refreshVisuals()
             return button
         }
 
@@ -382,6 +457,8 @@ final class InAppBrowserWindowController: NSWindowController, NSWindowDelegate {
             let symbol = isPinnedOnTop ? "pin.fill" : "pin"
             button.image = NSImage(systemSymbolName: symbol, accessibilityDescription: "Pin (Always on Top)")
             button.image?.isTemplate = true
+            let cfg = NSImage.SymbolConfiguration(pointSize: 12, weight: .semibold)
+            button.image = button.image?.withSymbolConfiguration(cfg)
             setToggledStyle(button, isOn: isPinnedOnTop)
         }
     }
@@ -393,6 +470,8 @@ final class InAppBrowserWindowController: NSWindowController, NSWindowDelegate {
             let symbol = isGestureModeEnabled ? "hand.raised.fill" : "hand.raised"
             button.image = NSImage(systemSymbolName: symbol, accessibilityDescription: "Gesture Mode")
             button.image?.isTemplate = true
+            let cfg = NSImage.SymbolConfiguration(pointSize: 12, weight: .semibold)
+            button.image = button.image?.withSymbolConfiguration(cfg)
             setToggledStyle(button, isOn: isGestureModeEnabled)
         }
     }

google_apps/google_apps.entitlements

@@ -6,5 +6,7 @@
 	<true/>
 	<key>com.apple.security.network.client</key>
 	<true/>
+	<key>com.apple.security.files.downloads.read-write</key>
+	<true/>
 </dict>
 </plist>