This fixes LT-22616: Word Cat contents change when bundle selected

[jtmaxwell3]

This fixes https://jira.sil.org/browse/LT-22616. The root problem was that SandboxBase and InterlinVc were making different guesses about the word cat and gloss, which confused the user. The general principle is that when you first click on a word in the interlinear text, the sandbox should show whatever was showing in the interlinear text. The word cat and gloss should only change after the user makes a change to the sandbox.

I also added code to guess the word gloss and category whenever the morphemes change.

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This change is 

Devin's analysis:

The interlinear display (InterlinVc) and the editing sandbox (SandboxBase) had independent implementations for guessing word glosses and parts of speech from morph bundles. This caused inconsistencies—the display could show one guess while the sandbox applied a different one.
This PR:
Extracts the private guess methods from an inner class of InterlinVc into internal static methods at the InterlinVc class level, returning richer types (ILexSense, IPartOfSpeech) instead of just display strings.
Adds SandboxBase.GuessWordCatAndGloss which delegates to those same InterlinVc methods, ensuring consistent guesses.
Renames CopyLexEntryInfoToMonomorphemicWordGlossAndPos → CopyLexEntryInfoToWordGlossAndPosIfEmpty and adjusts CopySenseToWordGloss to accept a real HVO directly.
After morpheme updates in HandleSelectMorphComboItem, calls CopyLexEntryInfoToWordGlossAndPosIfEmpty to refresh guesses.

[github-actions]

NUnit Tests

    1 files  ±0      1 suites  ±0   10m 39s ⏱️ + 2m 29s
4 302 tests ±0  4 229 ✅ +38  73 💤 ±0  0 ❌  - 38 
4 311 runs  ±0  4 238 ✅ +38  73 💤 ±0  0 ❌  - 38 

Results for commit c8657d2. ± Comparison against base commit dda17ab.

♻️ This comment has been updated with latest results.

[codecov-commenter]

Codecov Report

❌ Patch coverage is 16.66667% with 5 lines in your changes missing coverage. Please review.
✅ Project coverage is 32.96%. Comparing base (d4e14ac) to head (66112c7).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
Src/LexText/Interlinear/SandboxBase.cs	16.66%	4 Missing and 1 partial ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1007   +/-   ##
=======================================
  Coverage   32.96%   32.96%           
=======================================
  Files        1202     1202           
  Lines      278291   278295    +4     
  Branches    37166    37167    +1     
=======================================
+ Hits        91733    91743   +10     
+ Misses     158688   158677   -11     
- Partials    27870    27875    +5     

Files with missing lines	Coverage Δ
Src/LexText/Interlinear/SandboxBase.cs	35.53% <16.66%> (-1.18%)	⬇️

... and 8 files with indirect coverage changes

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[jasonleenaylor]

Src/LexText/Interlinear/SandboxBase.cs line 4264 at r1 (raw file):

			{
				m_editMonitor.DoPendingMorphemeUpdates();
				CopyLexEntryInfoToMonomorphemicWordGlossAndPos(true);

If a user has manually chosen a word gloss and word category will this overwrite them when they choose a different msa? I'm not sure that is desired if that is the case.

[jtmaxwell3]

@jasonleenaylor CopyLexEntryInfoToMonomorphemicWordGlossAndPos is poorly named because it only does the copy if the word gloss and/or category don't already exist. It should be something like GuessWordGlossAndPos.