Port the Fyne UI's onSessionExpire 1:1 to the Wails tray so an SSO token
expiry no longer leaves the user staring at a stale peer list. When
applyStatus sees the transition into the daemon's StatusSessionExpired,
fire a single OS notification (the lastStatus guard rate-limits it to
the transition itself, mirroring the Fyne sendNotification flag) and
bring the main window forward on the /login route so the frontend can
drive the renewed SSO flow. The Fyne client achieved the same end with
a runSelfCommand "login-url" helper; here the window is already
in-process so we route to it directly.
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