Ensure Param{Ref|Function|Method} does not override styles on its output

[philippjfr]

Previously options set on a ReplacementPane would simply override the equivalent setting on the inner component. Instead of doing that we should merge the stylesheets.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 85.36%. Comparing base (8eb0b14) to head (a67ede6).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff             @@
##             main    #8265       +/-   ##
===========================================
+ Coverage   70.20%   85.36%   +15.16%     
===========================================
  Files         347      348        +1     
  Lines       54092    54099        +7     
===========================================
+ Hits        37973    46184     +8211     
+ Misses      16119     7915     -8204     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.
• 📦 JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.