Savegames hold only the game state: no settings, no camera (settings stay in local storage)

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

src/fog.rs

@@ -228,7 +228,7 @@ mod tests {
         assert!(g.map.shown(out), "own ground beyond the lifted start is known");
         assert!(g.map.explored.iter().filter(|&&b| b).count() > explored);
         // savegame round trip
-        let json = crate::save::to_json(&g, &crate::render3d::Cam::new(0.0, 0.0), &crate::settings::Settings::default());
+        let json = crate::save::to_json(&g);
         let l = crate::save::from_bytes(json.as_bytes()).unwrap();
         assert_eq!(l.game.map.explored, g.map.explored);
         // the seer's eye opens a far area for a while