## Link to GitHub Issue or related Pull Request, if one exists
Related: #859 and #862.
## Description of change
Three SDVX (Valkyrie model) fixes:
* **API touch went to the wrong window.** SDVX registers touch on both
its Main Screen and Sub Screen windows, and the native injector kept
whichever attached last. The touch surface is now published explicitly:
sub screen window when windowed, main window in fullscreen.
* **Landscape never rotated API coordinates.** Synthetic contacts bypass
`transform::hardware_to_game`, so they missed the rotation a real finger
gets. Applied before injection now, as portrait already did. Extracted
to `sdvx_landscape_rotate` so both paths share it; gated on the native
path since `wintouchemu` rotates via the subscreen overlay instead.
* **`-sdvxnosub` didn't hide the sub window in fullscreen.**
`ShowWindow_hook` had branches for GITADORA, pop'n and IIDX but not
SDVX. Added the missing one.
## Testing
Tested Nabla