Methods for navigating through budgetline levels of abstraction

As a budget planner, I want to have a navigation interface capable of zooming across budget categories, in order to have a logical visualization of the granularity of the economic processes in place.

• decide and implement default zoom level
• allow selection of process to be zoomed in/out and pass on (1)
• create dictionary for processes included in (one for upper and one for lower level) (2)
• display dictionaries of processes for upper and lower level (3)
• allow selection of process from upper/lower level (4)
• update display to new selected process (1-4 for new selection)
• allow navigation of expenses

Acceptance criteria

• at least one button to increase abstraction
• for each process/intent that has descendants, a button that allows for descending one level of abstraction
• allow to focus on one process/intent, from which the upper and lower levels (if existant) can always be visualized