fix: render polls correctly in darkmode

[ghost]

Fixes #10003

[ghost]

polls-darkmode.mov

[jennifer-richards]

lgtm

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 88.54%. Comparing base (92f23c0) to head (775c8dc).
⚠️ Report is 9 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #10027      +/-   ##
==========================================
- Coverage   88.54%   88.54%   -0.01%     
==========================================
  Files         317      317              
  Lines       42343    42385      +42     
==========================================
+ Hits        37494    37530      +36     
- Misses       4849     4855       +6     

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