interactive: fix dark mode

[alexarice]

Fixes crash when switching theme caused by a textual update. Also adds a test to catch this in the future.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.40%. Comparing base (f33fbde) to head (7d7e475).
Report is 12 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #3582   +/-   ##
=======================================
  Coverage   90.39%   90.40%           
=======================================
  Files         467      469    +2     
  Lines       58870    58950   +80     
  Branches     5609     5611    +2     
=======================================
+ Hits        53218    53295   +77     
- Misses       4207     4213    +6     
+ Partials     1445     1442    -3     

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