LT-22609: Crash when creating New Project with trailing space in name

[thejambi]

Quick Summary

Fix LT-22609: FLEx crashes when creating a New Project with a trailing space in the Project name
LT0-22609. Trimming project name before file creation to fix the issue. Added FwNewLangProjectModel_ProjectName_TrimsSurroundingWhitespace tests to ensure project name leading or trailing spaces are trimmed.

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.

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This change is 

[github-actions]

⚠️ Commit Message Format Issues ⚠️

commit db0f03da6a:
2: B1 Line exceeds max length (138>80): "https://jira.sil.org/browse/LT-22578. ShowDialog calls needed to properly pass an owner parameter for the windows to behave as expected."
2: B4 Second line is not empty: "https://jira.sil.org/browse/LT-22578. ShowDialog calls needed to properly pass an owner parameter for the windows to behave as expected."

[thejambi]

Nevermind - closing this as I accidentally included changes for another issue as well.

[codecov-commenter]

Codecov Report

❌ Patch coverage is 33.33333% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 33.03%. Comparing base (b30d631) to head (017c87f).
⚠️ Report is 4 commits behind head on main.

Files with missing lines	Patch %	Lines
...c/Common/Controls/DetailControls/ChooserCommand.cs	0.00%	0 Missing and 1 partial ⚠️
Src/LexText/Morphology/InflAffixTemplateControl.cs	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1021      +/-   ##
==========================================
+ Coverage   32.99%   33.03%   +0.03%     
==========================================
  Files        1202     1202              
  Lines      278175   278193      +18     
  Branches    37152    37160       +8     
==========================================
+ Hits        91781    91888     +107     
+ Misses     158543   158465      -78     
+ Partials    27851    27840      -11     

Files with missing lines	Coverage Δ
Src/FwCoreDlgs/FwNewLangProjectModel.cs	79.59% <100.00%> (ø)
...c/Common/Controls/DetailControls/ChooserCommand.cs	0.00% <0.00%> (ø)
Src/LexText/Morphology/InflAffixTemplateControl.cs	0.00% <0.00%> (ø)

... and 12 files with indirect coverage changes

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