feat(invite/native): add people functionality fixes

Fix imports

Replace tokens with ones that are part of the Design System and are either the same or very similar

feat(base/ui/native): replaced react native TextInput component with our native Input component

Skip the welcome page for now, until we can remove the audio / video
toggle.

Updated screens with new ui on mobile

- created `ClearableInpu`t component on web & native
- added `ClearableInput` component to participants pane and used it for search in participants list
- update `AddPeopleDialog` to use `ClearableInput`

Introduce navigation for all in-conference screens.