feat: close sidebar on mobile after selecting a unit

[Agrendalath]

Description

When a user selects a unit on the course outline sidebar, it remains open. This behavior can be confusing on mobile devices because the sidebar is displayed on the entire screen. This PR changes the behavior to close the sidebar once the learner selects the unit.

Testing instructions

1. Ensure you have enabled the courseware.enable_navigation_sidebar Waffle flag.
2. Open any course unit on a mobile device.
3. Open the sidebar on the left side.
4. Select any unit and check that the sidebar was closed afterward.

Private-ref: BB-334 (temporary)

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 84.60%. Comparing base (9dc45e1) to head (89b24cf).
Report is 2 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1583   +/-   ##
=======================================
  Coverage   84.60%   84.60%           
=======================================
  Files         331      331           
  Lines        5656     5659    +3     
  Branches     1357     1397   +40     
=======================================
+ Hits         4785     4788    +3     
  Misses        854      854           
  Partials       17       17           

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[bradenmacdonald]

Makes sense to me! If you haven't already, can you just get a +1 from some product person, perhaps by asking on Slack #studio ?

[Agrendalath]

@bradenmacdonald, I posted a request on the #wg-product-core channel, as I couldn't find anything closer to the Learning MFE. Do you suggest posting it on the #studio channel, too?

[crathbun428]

Thank you for catching. This updated behavior makes sense to me.