* Migrate more jest tests to vitest
* Fix jest config
* Fix jest config
* Make remaining jest tests type-happy
* Iterate
* Fix Notifier import cycle
* Fix tests
* Delint
* Iterate
* Handle SDKContextClass `client` initialisation internally
Rather than via MatrixChat - this is predominantly for Lifecycle tests as they don't use a MatrixChat and it doesn't make much sense for this component to own this state.
* Fix tests
* Iterate
* Simplify diff
* Improve coverage
* Improve coverage
* Iterate