KDE Plasma routes a tray left-click to the SNI Activate method (right-click
opens the context menu), but NetBird wired no Activate action, so on KDE a
left-click appeared completely dead while only right-click surfaced the menu.
Bind the Linux tray OnClick handler to ShowWindow(). OpenMenu() is not an
option on Linux: Wails v3 leaves linuxSystemTray.openMenu unimplemented (it
only logs), so left-click→OpenMenu would still do nothing on KDE. ShowWindow()
is the same call Windows already runs from its double-click handler, and it
does not reproduce the macOS OpenMenu freeze (c77e5cef8) — that came from
NSStatusItem's blocking embedded menu loop, whereas Show/Focus return
immediately.
Split the Linux click handler into its own tray_click_linux.go and narrow the
macOS no-op bindTrayClick build tag accordingly. The context menu stays on
right-click on every host. On hosts that already open the menu on left-click
natively (GNOME Shell + AppIndicator) left-click now opens the window instead;
the menu remains on right-click.
