LT-22657: Fix Word export guidewords

[aror92]

Quick Summary

• Add IsClassified property to DictionaryConfigurationModel, modeled after the IsReversal property. Use this instead of Lexeme type to determine whether we are exporting a Classified Dictionary, since Configured Dictionary can also be a Lexeme type.
• For guidewords in a Configured Dictionary export, use the first selected field in Dictionary Configuration of type Headword, Lexeme Form, or Citation Form.
• Fixes #LT-22657.

Quick Summary

CI-ready checklist

• Commit messages follow .github/commit-guidelines.md.
• Builds & tests pass locally (or I've run the CI-style build via build.ps1, test.ps1, or MSBuild).
• For any Src/** folders touched, corresponding AGENTS.md files are updated or explicitly confirmed still accurate (no nested AGENTS.md under Src/xWorks; Src/AGENTS.md unaffected).
• I have considered all comments from an AI code reviewer (such as [Devin]https://app.devin.ai/review/sillsdev/FieldWorks/pull/####)

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This change is 

[github-actions]

Comment hygiene (advisory)

2 comment-style violation(s) in the lines this branch adds since origin/main.
Advisory only -- no check fails on these, and the same violations appear as inline warnings on the Files changed tab.

File	Category	Comment
Src/xWorks/LcmWordGenerator.cs:2936	comment-line-too-long	100 columns (max 98): <returns>A list of the full style names for the runs that should be...
Src/xWorks/LcmWordGenerator.cs:2965	comment-too-long	233 chars (budget 200): Configured Dictionary entries are based on either Headword, Lexeme...

Fix them per .claude/skills/fieldworks-code-commenting/SKILL.md.
Running .\build.ps1 -CommentHygiene (or .\test.ps1 -CommentHygiene) enforces them locally, and
re-wraps over-wide lines and repairs non-ASCII punctuation as it goes.

[github-actions]

NUnit Tests

    1 files  ±0      1 suites  ±0   10m 34s ⏱️ -18s
5 863 tests +2  5 782 ✅ +2  81 💤 ±0  0 ❌ ±0 
5 872 runs  +2  5 791 ✅ +2  81 💤 ±0  0 ❌ ±0 

Results for commit 11a0bf3. ± Comparison against base commit b8f5463.

♻️ This comment has been updated with latest results.

[codecov-commenter]

Codecov Report

❌ Patch coverage is 70.00000% with 6 lines in your changes missing coverage. Please review.
✅ Project coverage is 38.35%. Comparing base (b8f5463) to head (11a0bf3).

Files with missing lines	Patch %	Lines
Src/xWorks/LcmWordGenerator.cs	57.14%	2 Missing and 4 partials ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1110   +/-   ##
=======================================
  Coverage   38.35%   38.35%           
=======================================
  Files        1507     1507           
  Lines      350617   350629   +12     
  Branches    40298    40303    +5     
=======================================
+ Hits       134471   134494   +23     
+ Misses     186916   186902   -14     
- Partials    29230    29233    +3     

Files with missing lines	Coverage Δ
Src/xWorks/DictionaryConfigurationModel.cs	84.57% <100.00%> (+0.50%)	⬆️
Src/xWorks/WordStylesGenerator.cs	41.87% <ø> (ø)
Src/xWorks/LcmWordGenerator.cs	41.46% <57.14%> (+0.39%)	⬆️

... and 2 files with indirect coverage changes

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[thejambi]

@thejambi reviewed 4 files and all commit messages, and made 1 comment.
Reviewable status: complete! all files reviewed, all discussions resolved (waiting on aror92).