fix(DataMapper): Preserve descendant overrides across choice selection changes

[mmelko]

Summary
Choice selection no longer cascade-invalidates descendant overrides (substitutions, type overrides, nested choices)
Fixes "Reset Override" silently failing when substitution was selected before choice

Root cause: invalidateDescendants() removed substitution from definition but resetDescendantFields() didn't clear selectedMemberIndex on the live field — state inconsistency

Fix #3234
Fix #3232

Screen.Recording.2026-06-12.at.16.11.26.mov

Summary by CodeRabbit

• Tests

  • Expanded test coverage for choice selections with descendant and abstract field scenarios, including field substitutions and type override preservation.

• Refactor

  • Internal restructuring of choice selection logic for improved code maintainability and clarity.

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[mmelko]

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 92.60%. Comparing base (4b3dd21) to head (11976d3).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3308      +/-   ##
==========================================
- Coverage   92.60%   92.60%   -0.01%     
==========================================
  Files         650      650              
  Lines       25424    25410      -14     
  Branches     5847     6059     +212     
==========================================
- Hits        23544    23531      -13     
+ Misses       1878     1770     -108     
- Partials        2      109     +107     

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud