* ⬆️ chore: Migrate off deprecated @ariakit/react-core to @ariakit/react-components
@ariakit/react-core and its dependency @ariakit/core are deprecated (split into successor packages) and emit install-time warnings. @ariakit/react already ships the non-deprecated @ariakit/react-components transitively; the only direct use of react-core was the SelectRenderer deep import in ControlCombobox, which is now sourced from @ariakit/react-components/select/select-renderer (identical symbol and subpath). Both deprecated packages drop out of the lockfile and react-components dedupes to the single version @ariakit/react pins.
* ✅ test: Resolve ESM-only @ariakit split packages in jest
@ariakit/react-components and its peers are ESM-only (type: module) and declare only an import export condition, so jest's CJS resolver can't load them when @librechat/client's CJS build requires SelectRenderer. Add a custom jest resolver that resolves these @ariakit/* split packages with the import condition, and extend transformIgnorePatterns so babel transpiles them to CJS. Applied to both the client and packages/client jest configs.
