Windows drops webContents zoom on minimize/restore, so the UI snapped back
to 100% while Settings still read 125%. Zoom was only reasserted on the main
window's did-finish-load, never on show/restore and never for session windows.
Reassert the persisted level on show/restore + first load, wired once in
wireCommonWindowHandlers so the main window and secondary session windows
share it. The pet overlay opts out (zoom:false): it sizes its own OS window
to fit the sprite in unzoomed CSS px and has its own Alt+wheel scale, so
inheriting the global zoom would render the mascot larger than its window and
crop it (and it shares the renderer origin's zoom localStorage key).
Salvages #61245; keeps its pure-helper tests and adds a scope assertion.
Co-authored-by: HexLab98 <liruixinch@outlook.com>
