If the user has not been sent any messages, show a message in the quick access menu with an educational message. If the user can send private messages, also show a link to open the "new message" composer:
This also adds a general improvement to the quick-access-panel, to be able to show an `emptyStateWidget` instead of just a message if there is nothing to show in the panel, as well as initial general styles for empty state.
This PR revamps the topic timer UI, using the time shortcut selector from the bookmark modal.
* Fixes an issue where the duration of hours/days after last reply or auto delete replies was not enforced to be > 0
* Fixed an issue where the timer dropdown options were not reloaded correctly if the topic status changes in the background (use `MessageBus` to publish topic state in the open/close timer jobs)
* Moved the duration input and the "based on last post" option from the `future-date-input` component, as it was only used for topic timers. Also moved out the notice that is displayed which was also only relevant for topic timers.
