Rename FallListSelected sign group to FallListSelectedSign

[lambdalisue]

Summary

This PR renames the sign group from FallListSelected to FallListSelectedSign for consistency with naming conventions.

Changes

• Renamed SIGN_GROUP_SELECTED constant from PopUpFallListSelected to PopUpFallListSelectedSign
• Renamed SIGN_SELECTED constant from FallListSelected to FallListSelectedSign
• Updated documentation to reflect the new sign group name
• Updated the sign definition in the highlight setup

🤖 Generated with Claude Code

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 83.45%. Comparing base (e892695) to head (00d4630).
⚠️ Report is 11 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #43      +/-   ##
==========================================
+ Coverage   82.14%   83.45%   +1.31%     
==========================================
  Files          27       31       +4     
  Lines        1798     1977     +179     
  Branches      185      200      +15     
==========================================
+ Hits         1477     1650     +173     
- Misses        318      324       +6     
  Partials        3        3              

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