Adds eslint@^8.57.1, prettier@^3.0.0, typescript@^5.6.2 as direct
devDependencies so pnpm --frozen-lockfile exposes their binaries
in node_modules/.bin for CI lint/type-check/format-check steps.
Fixes PRI-564.
Co-Authored-By: Paperclip <noreply@paperclip.ing>
The test script runs vitest and imports from @testing-library/react and
@testing-library/jest-dom, but none of these were listed as devDependencies.
Adds vitest ^3.0.5 and all required @testing-library packages matching other
plugin repos in the org.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>