Two adjustments to the intro plane:
1. Autonomous cruise speed. Adds BASE_SPEED (1/28 per second of
wallclock) to targetProgress on every frame, so the plane crosses
the screen on its own in ~28 s without any input. Mouse motion
still adds a boost (one full traversal per ~4500 px of cursor
travel), which feels like the plane "speeding up" when the user
interacts. Time delta clamped to 0.1 s so the plane doesn't jump
forward after the tab returns from background.
2. Reverse direction. Plane now enters from upper-right (x = +16),
traverses to upper-left (x = -16), nose pointing -X. Wrapper rot.y
flipped to +π/2; px formula flipped; banking angles inverted so
the plane still rolls "into the turn" along its new direction.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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