filter text is saved to presenter but showing the filter bar is not

[lydavid]

leads to the filter remaining when popping backstack but not showing filter bar

Either hoist isFilterMode to each presenter, or make use of state holders (should still save in presenter).
https://developer.android.com/topic/architecture/ui-layer/stateholders#choose-viewmodel

request focus always in beginning of text field
https://developer.android.com/develop/ui/compose/state#store-state
https://stackoverflow.com/questions/64181930/request-focus-on-textfield-in-jetpack-compose