Flip pitch sign — turns out positive rotation.x was nose-down

After the wrapper's -π/2 yaw, applying positive rotation.x to the
planeHolder rotates the plane around world X with the nose dropping,
not lifting (visible in the user-supplied screenshot). Flipping to
-0.18 (≈10°) puts the nose where the trajectory says it should go.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

js/intro-scene.js

@@ -136,9 +136,9 @@ function tick() {
 
   planeHolder.position.set(px, py + bob, 0);
 
-  /* Banking — léger roulis + nez juste un peu relevé (cabré réaliste) */
+  /* Banking — léger roulis + nez relevé (cabré réaliste) */
   const targetRoll  =  0.18 + (p - 0.5) * 0.25;   // .z = roulis
-  const targetPitch =  0.06 + p * 0.02;            // .x = ~3.5° à 4.5° de cabré
+  const targetPitch = -0.18 - p * 0.04;            // .x = nez en l'air ~10°
   const targetYaw   = -(p - 0.5) * 0.10;           // .y = soupçon de yaw
   planeHolder.rotation.z += (targetRoll  - planeHolder.rotation.z) * 0.08;
   planeHolder.rotation.x += (targetPitch - planeHolder.rotation.x) * 0.08;