The wallpaper maker/runtime overrides the desktop with the cockpit
wallpaper on profile activation but never put the user's own back.
Now RioCoordinator captures the current wallpaper (SPI_GETDESKWALLPAPER,
via new WallpaperApplier.GetCurrent) the first time it overrides it, and
restores it (WallpaperApplier.Restore) on every GoDormant and on Dispose
— so going idle, a native game taking the port, or app exit returns the
desktop to what the user had. Capture is once-per-override so switching
between cockpit profiles keeps the real previous wallpaper; only engages
when OverlayTemplatePath is set. Builds clean on net48 + net40.
Known gap (documented in PLAN.md): a hard crash between apply and restore
leaves the cockpit wallpaper, since SPIF_UPDATEINIFILE persists it.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
CydandClaude Fable 5
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