lean-poker / boardgame.io / 25882182923

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fix(examples): pin react/react-dom to example's copy via alias

After the React 16 → 19 bump in the library, the example's parcel
build was loading two React versions in the same bundle: parcel
resolved \`react\` from the lib's dist/esm directory, which walked up
to the repo-root node_modules (react@19), while the example's own
code resolved its own react@18. Two Reacts → element \$\$typeof
mismatch → "Objects are not valid as a React child" at every
WrappedBoard render, and a blank page.

Aliasing react / react-dom to ./node_modules/react in the example's
package.json forces parcel to resolve a single copy regardless of
the importer's location.

Verified end-to-end with a headless playwright smoke:
- Tic-Tac-Toe singleplayer renders and accepts moves
- Chess routes navigate
- Lobby example logs in and shows the match-creation form
- Zero console / page errors

Refs #3.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

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