♿ [#2376] Add aria-expanded for desktop navigation menus

[jiromaykin]

Taiga: https://taiga.maykinmedia.nl/project/open-inwoner/task/2376

aria-expanded should be added to the element that controls the expanded state of other elements.

Due to Apple's conscious decision in 2008 to not set focus on clicked buttons, this still behaves slightly different in Safari (opening 1 menu does not close the other there).

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.20%. Comparing base (dedbd14) to head (6b08ca2).

Additional details and impacted files

@@           Coverage Diff            @@
##           develop    #1246   +/-   ##
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  Coverage    95.20%   95.20%           
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  Files          978      978           
  Lines        35603    35603           
========================================
  Hits         33896    33896           
  Misses        1707     1707           

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[pi-sigma]

Do we only need this for the "Onderwerpen" button? The "Welkom" button currently doesn't have an aria-expanded attribute

[jiromaykin]

Do we only need this for the "Onderwerpen" button? The "Welkom" button currently doesn't have an aria-expanded attribute

? But it does. And yes, they both need it.

[pi-sigma]

Sorry, was looking in the wrong place for the "Welkom" button. Works fine (though only tested on FireFox and Chrome).