Shutter v1.0.0

• Initial release: toggle Light and Dark Mode from anywhere with one global shortcut — ⌃⌥⌘D out of the box, re-recordable in Settings — or a left click on the menu bar icon.
• The switch is instant, animated by the system, and needs no permissions: no Input Monitoring, no Accessibility, nothing to grant.
• The menu bar icon shows where you are — the filled shutter leaf marks the current side, day or night — and follows along even when something else flips the appearance.
• English and Korean, following the macOS language.