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* feat: Display an icon in the room header for rooms with shared history * fix: Apply suggestions from code review - Simplifies `isRoomHistoryShared` expressions using type inferrence. - Adds failure messages to unit test. Co-authored-by: Doug <6060466+pixlwave@users.noreply.github.com> * fix: Remove extension method in favour of field on configuration. * fix: Distinguish between `shared` and `worldReadable` icons. * refactor: Use `RoomHistorySharingState` enum with extension methods --------- Co-authored-by: Doug <6060466+pixlwave@users.noreply.github.com>