Isolate gs-pointer CSS variables to color stop cards only

[Copilot]

The proximity-aware glow effect was applying --gs-pointer-x/y/opacity variables to buttons and selects in addition to .stop elements. These variables should only apply to color stop cards.

Changes

• JS selector: 'button, select, .stop' → '.stop'
• CSS rules: Removed button and select from the global glow effect styles

/* Before */
:global(button),
:global(select),
:global(.stop) { ... }

/* After */
:global(.stop) { ... }

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