* feat(tray): remove Start on Login and About from the tray menu
Both entries already live in Settings: the autostart switch is in the
general page and About is a dedicated sidebar page, so the tray items
are redundant. View Logs stays.
Removes the Start on Login checkbox item along with its
_update_autostart_checkbox/_on_autostart_toggled wiring and the now
unused _add_menu_checkbox helper, plus the About item and
_on_about_clicked. _show_settings_page("about") stays for the Update
Available item. autostart_manager is untouched since Settings uses it.
Fixes#654
* fix(settings): sync autostart switch with the real desktop entry
The tray's removed _update_autostart_checkbox also reconciled
general.autostart with the actual login desktop entry at startup. Move
that check into the settings load so the Start on Login switch still
reflects reality when the entry changes outside the app.
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Co-authored-by: Jatin K Malik <jatinkrmalik@gmail.com>
