Add setting to hide the startup picker with a one-time menu-bar hint

Lets someone skip the startup picker entirely; the first time it would've
shown with nothing running, a small popover on the menu bar icon points
there instead, then never again.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

Sources/ManageWindow.swift

@@ -508,6 +508,8 @@ private final class SettingsViewController: NSViewController {
     private let autoUpdateCheckbox = NSButton(
         checkboxWithTitle: "Automatically check for updates", target: nil, action: nil)
     private let launchAtLoginCheckbox = NSButton(checkboxWithTitle: "Launch at Login", target: nil, action: nil)
+    private let hideStartupPickerCheckbox = NSButton(
+        checkboxWithTitle: "Hide the startup picker when no profiles are running", target: nil, action: nil)
     private let checkNowButton = NSButton(title: "Check for Updates\u{2026}", target: nil, action: nil)
     private let tagStyleLabel = NSTextField(labelWithString: "Window tag:")
     private let tagStylePopUp = NSPopUpButton(frame: .zero, pullsDown: false)
@@ -564,12 +566,17 @@ private final class SettingsViewController: NSViewController {
         autoUpdateCheckbox.action = #selector(toggleAutoUpdate)
         autoUpdateCheckbox.state = UpdateChecker.automaticCheckEnabled ? .on : .off
 
+        hideStartupPickerCheckbox.target = self
+        hideStartupPickerCheckbox.action = #selector(toggleHideStartupPicker)
+        hideStartupPickerCheckbox.state = StartupBehavior.hidePicker ? .on : .off
+
         checkNowButton.target = self
         checkNowButton.action = #selector(checkNow)
         checkNowButton.bezelStyle = .rounded
 
         stack = NSStackView(views: [
-            launchAtLoginCheckbox, clickActionRow, tagStyleRow, autoUpdateCheckbox, checkNowButton,
+            launchAtLoginCheckbox, clickActionRow, tagStyleRow, hideStartupPickerCheckbox,
+            autoUpdateCheckbox, checkNowButton,
         ])
         stack.orientation = .vertical
         stack.alignment = .leading
@@ -610,7 +617,7 @@ private final class SettingsViewController: NSViewController {
             clickActionLabel.intrinsicContentSize.width
                 + clickActionPopUp.intrinsicContentSize.width + clickActionRow.spacing,
         ]
-        let widest = ([launchAtLoginCheckbox, autoUpdateCheckbox, checkNowButton]
+        let widest = ([launchAtLoginCheckbox, hideStartupPickerCheckbox, autoUpdateCheckbox, checkNowButton]
             .map(\.intrinsicContentSize.width) + rowWidths)
             .max() ?? 0
         preferredContentSize = NSSize(width: widest + 40, height: stack.fittingSize.height)
@@ -648,6 +655,10 @@ private final class SettingsViewController: NSViewController {
         UpdateChecker.automaticCheckEnabled = autoUpdateCheckbox.state == .on
     }
 
+    @objc private func toggleHideStartupPicker() {
+        StartupBehavior.hidePicker = hideStartupPickerCheckbox.state == .on
+    }
+
     @objc private func checkNow() {
         UpdateChecker.checkManually { result in
             DispatchQueue.main.async {