Fix left click on status item for macOS 27

[winebarrel]

Problem

On macOS 27, left-clicking the status item no longer opens the popover.

Since macOS 27, the menu bar is hosted by the system, so mouse events are no longer delivered to MouseHandlerView, which was added as a subview of the status item button.

Changes

• Remove MouseHandlerView and add StatusItemClickHandler, which handles clicks via the button's target/action (sendAction(on: [.leftMouseUp, .rightMouseUp])).
  • Left click toggles the popover.
  • Right click (or Control-click) shows the menu that SwiftUI attached to the status item (RightClickMenuView).
  • The menu is detached from the status item so the action gets called, and is detached again whenever SwiftUI re-attaches it (KVO).
• Update Package.resolved (MenuBarExtraAccess 1.3.1, swift-collections 1.7.1).

Testing

• Verified on macOS 27 that left click opens the popover and right click shows the menu.
• Not verified on macOS 26 or earlier (deployment target is 14.6).

Same fix as winebarrel/Pullse#128.