NewTray's eight-parameter signature crossed Sonar's seven-parameter
threshold once Update joined the dependency list. Bundle the six service
pointers (Connection, Settings, Profiles, Peers, Notifier, Update) into
a TrayServices struct, leaving NewTray with three arguments — the two
Wails platform handles plus the service bag. Tray.svc replaces the
individual fields; call sites use t.svc.Connection etc.
Adding another service later is now a one-line struct change instead
of a NewTray signature break.
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