fix(player): scope pointer lock and ground snap to game scene

PointerLockControls now targets #game-canvas and respects the
settings menu, and document.exitPointerLock() only runs when a
pointer lock is actually active. The terrain ground snap in
PlayerController is gated on sceneMode === "game" so it doesn't
fight the physics test scene's flat floor.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

src/world/player/PlayerCamera.tsx

@@ -1,18 +1,29 @@
 import { useEffect } from "react";
 import { useThree } from "@react-three/fiber";
 import { PointerLockControls } from "@react-three/drei";
+import { useSettingsStore } from "@/managers/stores/useSettingsStore";
 import { setGlobalCamera } from "@/world/GameCinematics";
 
 export function PlayerCamera(): React.JSX.Element {
   const camera = useThree((state) => state.camera);
+  const isSettingsMenuOpen = useSettingsStore(
+    (state) => state.isSettingsMenuOpen,
+  );
 
   useEffect(() => {
     setGlobalCamera(camera);
     return () => {
       setGlobalCamera(null);
+      if (document.pointerLockElement) {
         document.exitPointerLock();
+      }
     };
   }, [camera]);
 
-  return <PointerLockControls />;
+  return (
+    <PointerLockControls
+      enabled={!isSettingsMenuOpen}
+      selector="#game-canvas"
+    />
+  );
 }

src/world/player/PlayerController.tsx

@@ -34,6 +34,7 @@ import {
   EBIKE_CAMERA_TRANSFORM,
   EBIKE_DECELERATION_DURATION_MS,
 } from "@/data/ebike/ebikeConfig";
+import { useSceneMode } from "@/hooks/debug/useSceneMode";
 
 /** Global window properties used for ebike communication */
 interface EbikeGlobalState {
@@ -152,6 +153,7 @@ export function PlayerController({
   spawnPosition,
 }: PlayerControllerProps): null {
   const camera = useThree((state) => state.camera);
+  const sceneMode = useSceneMode();
   const movementLocked = useRepairMovementLocked();
   const terrainHeight = useTerrainHeightSampler();
   const movementLockedRef = useRef(movementLocked);
@@ -483,6 +485,7 @@ export function PlayerController({
       }
     }
 
+    if (sceneMode === "game") {
       const groundHeight = terrainHeight.getHeight(
         capsule.current.end.x,
         capsule.current.end.z,
@@ -498,6 +501,7 @@ export function PlayerController({
           onFloor.current = true;
         }
       }
+    }
 
     if (movementModeRef.current === "ebike") {
       let targetSteer = 0;