fix(menubar): fix popover layout-recursion crash on macOS 26/27

[Leewallace017]

Description

On macOS 26/27, clicking the menu bar icon can crash the app with EXC_BAD_ACCESS ("Thread stack size exceeded due to excessive recursion"). The main thread overflows in an unbounded AppKit/SwiftUI layout loop while the popover is being shown.

Root cause: the popover's NSHostingController uses sizingOptions = .preferredContentSize (added in #200 to fix positioning), which continuously re-pushes the SwiftUI content size into the popover window. With NSPopover.animates = true, macOS 26/27's updated SwiftUI never converges the animated resize:

NSPopover.show
  -> NSHostingView.windowDidLayout
    -> updateAnimatedWindowSize
      -> _NSPopoverWindow.setFrame:display:
        -> layout   (repeats ~6,500x) -> stack overflow

This is the layout-recursion fragility flagged in #64, escalated from a warning into a hard crash by the newer SwiftUI. Reproduced on macOS 27.0 (build 26A5353q), Apple Silicon.

Changes

• Fix the crash: disable the native popover animation (animates = false) in setupPopover() and recreatePopover(), so the animated window resize can no longer feed the loop. The preferredContentSize/sizingOptions sizing from fix(popover): Fix popover positioning offset and menubar overlap #200 is left intact, so the popover's content-hugging size and position are unchanged.
• Keep an animated open: replace the native animation with a custom SwiftUI fade + scale-from-top entrance in PopoverContentView. It runs purely as an opacity/transform on the fixed-size view, so it cannot re-trigger the window-resize loop.
• Fix a dismiss/re-open race: clicking the status item could occasionally close and immediately re-open the popover (the outside-click monitor and the button action racing). The popover now records its last close time, and togglePopover ignores a re-open within 0.25s of a close.

Screenshots / Screen Recordings

Screen recording (open animation + click-to-toggle + no crash) attached below.

Checklist

• I have tested these changes on a running build (Xcode 27 on macOS 27): repeated open/close with no crash, animated open, polished sizing, reliable click-to-toggle

popover-crash-fix-demo.mp4

• I have attached screenshots/recordings for any visual changes
• I have not introduced App Group or grouped Keychain usage
• N/A — no new user-facing strings