test(deps): make suite pass on React 19 / MUI 9 / chai 6

[leecalcote]

Summary

• Restore the React 17/18-shaped test surface that enzyme + react-shallow-renderer + the cfaester adapter still expect, layered on top of the upgraded React 19 runtime — __SECRET_INTERNALS_DO_NOT_USE_OR_YOU_WILL_BE_FIRED stub, hook-call → shallow-renderer dispatcher routing, fiber-walking findDOMNode, native-event-based Simulate (with input value-tracker reset + checkbox-via-click), and an Object.freeze skip for React elements so we can null _owner at creation.
• Migrate two components whose APIs broke in the dep bump: TablePagination to MUI v9's slotProps.actions.{previousButton,nextButton} / slotProps.select, and TableToolbar from the dropped <ReactToPrint> / <PrintContextConsumer> pair to a useReactToPrint hook wrapper.
• Override react-is to ^19.2.5 so the adapter's element check recognizes React 19's react.transitional.element symbol, and externalize runtime deps in rollup.config.js so peerDeps and @babel/runtime-corejs3/* subpaths stop tripping rollup's "Unresolved dependencies" warning.

Result: npm test → 234 passing, 0 failing. rollup -c → no unresolved-dependency warnings.

Test plan

• npm test — full mocha suite passes (234 tests)
• npx rollup -c — clean build, no "Unresolved dependencies" warning
• CI green on this branch

[Copilot]

Pull request overview

Updates the repository to keep the existing Mocha + Enzyme test suite and build tooling working after upgrading to React 19, MUI v9, and Chai 6. This primarily does so by restoring legacy React test surfaces expected by the Enzyme React 18 adapter, and by adjusting a couple of component integrations for the newer MUI / react-to-print APIs.

Changes:

• Extend test/setup-mocha-env.js with React 19 compatibility shims (internals stub, hook dispatch routing, Simulate, and findDOMNode polyfills) and adjust jsdom globals for Chai 6.
• Update TableToolbar printing implementation to use useReactToPrint instead of the removed ReactToPrint/PrintContextConsumer components.
• Update TablePagination to MUI v9 slotProps and adjust Rollup externals + npm overrides (react-is).

Reviewed changes

Copilot reviewed 5 out of 6 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
test/setup-mocha-env.js	Adds React 19/Chai 6 shims for Enzyme + shallow rendering and DOM event simulation.
src/components/TableToolbar.js	Migrates printing to useReactToPrint hook via a small wrapper component.
src/components/TablePagination.js	Migrates MUI TablePagination props to the v9 slotProps API.
rollup.config.js	Externalizes dependencies/peerDependencies (including subpath imports) to remove unresolved-dep warnings.
package.json	Adds an npm overrides pin for react-is to align React 19 element symbol handling.
package-lock.json	Lockfile updates reflecting dependency/override resolution changes.

[leecalcote]

@copilot please re-review the latest changes.