DKR-R v1.0.9 - Detail Playtest 3

This fixes the invisible custom car picker in Experimental Rollback. Extract
this into a fresh folder. Everyone in the lobby needs this same build.

What was wrong

The controls were reading the correct online vehicle selection, but the drawing
helper was looking at the old offline world. That meant you could change cars
without seeing the portraits or menu. Drawing now goes through the online
owner as well. The existing title, records, wooden frames, transparent arrows,
portraits, car names and Ready labels are kept, not replaced with a new menu.

Both US ROM revisions are covered. The native frame and text callbacks use the
private guest's checked trampolines. Temporary callback bindings are restored
after drawing and never enter guest arguments, saves or network messages.
Offline drawing, car selection controls, CPU choices, seating, wheel animation,
records handling and the previous detail/performance repairs are unchanged.

What to check

[ ] Host and join with custom cars enabled on both machines.
[ ] At Track Select, choose Car. Everyone can SEE their picker and portraits.
[ ] Move left/right, choose Vanilla or a custom car, and confirm with A.
[ ] B returns normally; Ready labels and the other player's choice are visible.
[ ] If available, repeat with 3 or 4 online players and online full-screen view.
[ ] Start the race and check both the chosen car and the other racers' cars.
[ ] Offline single-player and local multiplayer still show the same menu.

If the picker is still missing, close DKR-R normally and send runtime.log from
both PCs. The new drawing route reports [custom-vehicles][owned-menu] a limited
number of times, followed by the existing native-menu diagnostic.

Windows x64 and Linux x86_64 AppImage. Compiled, linked and statically inspected
only. The game, mods, test executables and AppImage were not run. Gameplay and
visual acceptance remain with you. No ROMs, saves or personal settings included.
This playtest is not a signed automatic-update release.
