Fix minimum pitch angle calculation and add test for floor collision handling in third-person camera

src/runtime-three/third-person-navigation-controller.ts

@@ -33,7 +33,7 @@ const DEFAULT_CAMERA_DISTANCE = 4.5;
 const MIN_CAMERA_DISTANCE = 1.5;
 const MAX_CAMERA_DISTANCE = 7;
 const DEFAULT_PITCH_RADIANS = 0.35;
-const MIN_PITCH_RADIANS = -0.2;
+const MIN_PITCH_RADIANS = -Math.PI * 0.3;
 const MAX_PITCH_RADIANS = Math.PI * 0.45;
 export const THIRD_PERSON_CAMERA_COLLISION_RADIUS = 0.2;
 const CAMERA_COLLISION_RECOVERY_SPEED = 6.5;