chore: remove unused rollup plugin devDependencies

[Copilot]

Three rollup plugins were listed as devDependencies and used in rollup.config.js but had no actual effect on the build output.

• @rollup/plugin-replace — configured to replace process.env.NODE_ENV, but the source never references it and react/react-dom are declared external so they're never bundled
• @rollup/plugin-commonjs — no CommonJS require() in source; all npm deps are external
• @rollup/plugin-node-resolve — all node_modules imports (react, react-dom/client) are external and never resolved during bundling

Result: rollup.config.js reduces to just @rollup/plugin-babel + @rollup/plugin-terser:

// before
const plugins = [
  replace({ 'process.env.NODE_ENV': JSON.stringify('production'), preventAssignment: true }),
  nodeResolve(),
  commonjs(),
  babel({ babelHelpers: 'bundled', exclude: 'node_modules/**' }),
]

// after
const plugins = [
  babel({ babelHelpers: 'bundled', exclude: 'node_modules/**' }),
]

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[github-actions]

🎉 This PR is included in version 5.1.2 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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