chore(frontend): React 18 → 19 への移行 (#464)#543
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react / react-dom / @types/react / @types/react-dom を ^19.2.0 に bump。 公式 React 19 Upgrade Guide に沿って破壊的変更を確認し、該当コードは なし（ReactDOM.render/hydrate/findDOMNode/文字列ref/propTypes/ defaultProps/useFormState はいずれも未使用、entry.client は既に hydrateRoot 使用）。forwardRef は React 19 でも有効なため据え置き。 Privy(^18||^19) など主要ピアの React 19 対応を確認。typecheck パス。 Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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Closes #464
概要
pkgs/frontendの React を 18 → 19 へ bump。公式 React 19 Upgrade Guide に沿って破壊的変更を確認し、Issue の方針どおり React 19 単体の bump に限定（新機能採用・forwardRefクリーンアップはスコープ外）。reactreact-dom@types/react@types/react-dom差分は
package.json4行 +pnpm-lock.yamlのみ。公式ガイドの破壊的変更チェック
コードベースを走査し、該当コードはいずれも存在せずコードmod不要：
ReactDOM.render/hydrate/unmountComponentAtNode/findDOMNode/createFactory→ なし（entry.client.tsxは既にhydrateRoot使用、React Router v7 管理）propTypes/defaultProps（関数コンポーネント）→ なしuseFormState→useActionState→ 該当なしuseRef()/ ref コールバックの暗黙 return（@types/react 19 で型エラー化）→ typecheck で未検出＝該当なしforwardRef（3ファイル）は React 19 でも有効（deprecated のみ）。shadcn/ui を upstream に近く保つ方針に従い据え置き依存の互換性
@privy-io/react-auth: peerreact: "^18 || ^19"✅react-day-picker/react-i18next: React 19 許容 ✅valtio→use-sync-external-store、@ladle/react→react-inspector）は transitive かつ React 18 時点から既存検証
react-router typegen && tsc --noEmit）.env.localを要するためローカル未実施 → CI / レビュー環境で確認お願いします補足
pnpm frontend buildはapp/vite-polyfills/ssr-buffer.tsのnode:buffer外部化で失敗しますが、React 18 でも同一に再現する既存の問題で本 PR とは無関係。別途 Issue 化を推奨。🤖 Generated with Claude Code