feat(select): add Neon select theme

[devthedevil]

Summary

Ports the global Neon theme (already used by the modal component) to the select component's theme registry, per #351.

Change

• src/components/select/dependencies/themes.json: added a Neon entry (dyvix-select-neon / dyvix-select-input-neon / dyvix-select-dropdown-neon, default-animation: pulse — matching modal's Neon animation).
• src/components/select/dependencies/style/themes.css: added the corresponding .dyvix-select-neon .dyvix-select-input-neon and .dyvix-select-neon .dyvix-select-dropdown-neon rule blocks (base/hover/focus/placeholder for the input, base/li/li:hover/scrollbar for the dropdown), following the same structure as the existing Lens/Industrial/Ember select themes and reusing modal's Neon color palette (cyan-to-magenta radial gradient, magenta glow shadow).

Testing

• Verified themes.json is valid JSON and the new theme object matches the shape of existing entries.
• Verified the new CSS selectors follow the exact same nesting pattern (.dyvix-select-{theme} .dyvix-select-input-{theme} / .dyvix-select-{theme} .dyvix-select-dropdown-{theme}) used by every other select theme, so dev-engine/scripts/check-themes.js will now detect Neon as present for the select component.
• DYVIX_GLOBAL_THEME.NEON already exists in src/constants.js (auto-generated, consumed by modal), so no changes were needed there.

Closes #351

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