Add keyboard shortcut to switch between tabs

[lasersushi]

Summary

Adds a customizable keyboard shortcut for switching between the Home and Shelf views in the notch. The default shortcut is ⌘⇧Y, configurable from the Shortcuts settings.

When the shortcut is pressed:

• If the notch is open, it switches between the Home and Shelf
• If the notch is closed, it opens the notch on the screen the cursor is currently on, switches the view, and auto-closes after 3 seconds

Implements the feature request in #1195.

Note: The original request suggested left/right arrow keys as the default, but those would conflict with too many system and app shortcuts. ⌘⇧Y was chosen to be consistent with the existing shortcut style in this app — it's fully rebindable via the Shortcuts settings.

Changes

• ShortcutConstants — new switchTab KeyboardShortcuts.Name with default ⌘⇧Y
• ShortcutsSettingsView — new KeyboardShortcuts.Recorder row labeled "Switch Tab:"
• boringNotchApp — new KeyboardShortcuts.onKeyDown handler that:
  • resolves the correct view model for the screen under the cursor (when Show on all displays is enabled)
  • toggles coordinator.currentView between .home and .shelf with a smooth animation
  • opens the notch if closed, then schedules a cancellable auto-close after 3 seconds
• Localizable.xcstrings — auto-generated entries for the new "Switch Tab:" label

Testing with Xcode

• Pressing ⌘⇧Y with the notch open correctly toggles between Home and Shelf views
• Pressing ⌘⇧Y with the notch closed opens the notch, switches the view, and auto-closes after 3 seconds
• Rebinding the shortcut in Settings → Shortcuts works and persists across restarts
• With Show on all displays enabled, the shortcut opens the notch on whichever screen the cursor is currently on
• Repeatedly pressing the shortcut while the auto-close timer is running cancels the previous timer and restarts it (no flicker / premature close)

Screen Recordings

Screen.Recording.2026-05-12.at.5.41.38.PM.mov