Add ORB trigger modes, collision-driven orb behavior, and UI tweaks for NOTES/GATES

[jeromepotter]

Motivation

• Clarify rotation direction labels and reorder the NOTES submenu controls so the Play button and rotation toggle are more intuitive.
• Provide new orb-triggering modes that let orb collisions trigger notes, and ensure those options are only available when collision detection is enabled.
• Replace the blue collision checkmark with a black X visual and remove gate count +/- controls from the GATES panel to move transposition controls to the transpose section.

Description

• Added CSS for a custom collision checkbox input.collision-toggle that shows a black ✕ when checked and supports a disabled state.
• Reordered the NOTES panel header buttons so PLAY appears before the direction button and changed the direction button labels via getDirectionToggleLabel and updateDirectionUI to show the next rotation state and toggle dark mode accordingly.
• Changed the GATES direction label to CCW by default and removed the -1/+1 gate count buttons from under the Gates slider.
• Added two new orb trigger options ORB and ORB + CIRCLE in both the inline and modal trigger selects, marked with `data-requires-collision=

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Codex Task

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