fix(react-doctor): migrate components to React 19 APIs

[bntvllnt]

Summary

• Migrates @vllnt/ui components from forwardRef to React 19 ref-as-prop functions.
• Converts useContext call sites to React 19 use().
• Raises @vllnt/ui React peer dependencies to >=19.0.0.
• Regenerates registry component copies from the build output.
• Note: the official React 19 codemod was attempted, but this environment is missing libsecret-1.so.0/keytar support, so an equivalent local jscodeshift transform plus manual fixes was used.

Validation

• pnpm -F @vllnt/ui lint
• pnpm -F @vllnt/ui exec tsc --noEmit --project tsconfig.build.json
• pnpm -F @vllnt/ui-registry exec tsc --noEmit --project tsconfig.json
• pnpm build
• pnpm test:once: 216 files, 1215 tests passed
• npx --yes react-doctor . --offline --json: no-react19-deprecated-apis=0
• npx --yes react-doctor . --diff origin/main --annotations --fail-on error --offline
• git diff --check

Closes #268

[vercel]

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Project	Deployment	Actions	Updated (UTC)
storybook	Ready	Preview, Comment	May 13, 2026 1:36am
ui.vllnt.ai	Ready	Preview, Comment	May 13, 2026 1:36am