Add tests for LT-22576

[imnasnainaec]

Quick Summary

Tests requested by #1051 author, generated by Claude.

Devin review: https://app.devin.ai/review/sillsdev/FieldWorks/pull/1052

CI-ready checklist

• Commit messages follow .github/commit-guidelines.md (subject ≤ 72 chars, no trailing punctuation; if body present, blank line then ≤ 80-char lines).
• No whitespace warnings locally:

  git fetch origin
  git log --check --pretty=format:"---% h% s" origin/<base>..
  git diff --check --cached

• Builds/tests pass locally (or I've run the CI-style build via Bash script or MSBuild).
• If this is core-developer AI-assisted work, I followed Docs/workflows/ai-pr-workflow.md and ran pr-preflight or the equivalent branch-readiness review before requesting review.
• For any Src/** folders touched, corresponding AGENTS.md files are updated or explicitly confirmed still accurate.

---

This change is 

[github-actions]

NUnit Tests

    1 files  ± 0      1 suites  ±0   8m 33s ⏱️ - 3m 0s
5 779 tests +18  5 698 ✅ +18  81 💤 ±0  0 ❌ ±0 
5 788 runs  +18  5 707 ✅ +18  81 💤 ±0  0 ❌ ±0 

Results for commit e100d6e. ± Comparison against base commit 3c9a28a.

♻️ This comment has been updated with latest results.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 38.07%. Comparing base (3c9a28a) to head (e100d6e).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1052      +/-   ##
==========================================
+ Coverage   38.02%   38.07%   +0.04%     
==========================================
  Files        1499     1499              
  Lines      349910   349910              
  Branches    40226    40226              
==========================================
+ Hits       133055   133225     +170     
+ Misses     187577   187420     -157     
+ Partials    29278    29265      -13     

see 7 files with indirect coverage changes

🚀 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.