chore: release v1.2.0

[ndlabdev]

Summary

• Bump version from 1.1.3 → 1.2.0 in preparation for npm publish

Changes included in this release

• feat: SelectMenu component with search, filtering
• refactor: Checkbox — variant, indicator, dark mode fixes, restProps, card click
• refactor: RadioGroup — variant, indicator, dark mode fixes, restProps, card click
• fix: Badge — isIconOnly falsy check for numeric label 0, eqeqeq lint
• fix: Button spec — update failing square/icon-only test case
• chore: cleanup unused imports and svelte-ignore comments

After merge

npm run build
npm publish