feat(ui): upgrade Select to authentic Lobby Terminal spec and remove lucide icons (#10)

[YoungSx]

Closes #10

Summary

• Removed Third-Party Icon Dependency: Completely removed lucide-react imports (ChevronDownIcon, ChevronUpIcon) from packages/ui/src/components/ui/select.tsx.
• Authentic Splatoon Vector Glyph: Created SelectChevron with rough-cut vector geometry (matching nav-chevron.tsx and button.tsx), supporting 180° rotation on dropdown open.
• Lobby Terminal Cut Edge & Palette: Added packages/ui/src/components/ui/select.module.css providing:
  • Asymmetric Lobby Terminal corner radii (7px 11px 8px 12px)
  • Warm sand surface (var(--desert-sand, #f4eee0)), pure black 2.5px border, and solid 2.5px shadow
  • Tactile focus/open displacement (translate(-1px, -1px)) with glowing focus ring (--input-focus-color)
  • Dropdown popup with solid 3px border, 4px solid shadow, and fluorescent yellow (var(--color-yellow)) hover highlight
  • Native ink splat (Splat10) active item stamp
• Documentation & Verification:
  • Updated apps/docs/src/docs/examples/select.tsx showcasing battle mode selection, focusColor tokens, and sizing.
  • All 27 regression suites passed (node tests/run.mjs).
  • TypeScript typechecks and ESLint checks pass with 0 errors.

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