Fix LT-22609: Crash creating New Project with trailing space

[thejambi]

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.

Quick Summary

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.

Notes for reviewers (optional)

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This change is 

[github-actions]

NUnit Tests

    1 files  ±0      1 suites  ±0   9m 52s ⏱️ -42s
4 313 tests +6  4 240 ✅ +6  73 💤 ±0  0 ❌ ±0 
4 322 runs  +6  4 249 ✅ +6  73 💤 ±0  0 ❌ ±0 

Results for commit 7fb8924. ± Comparison against base commit 6b15ecc.

♻️ This comment has been updated with latest results.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 33.03%. Comparing base (6b15ecc) to head (69816c7).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1022   +/-   ##
=======================================
  Coverage   33.03%   33.03%           
=======================================
  Files        1202     1202           
  Lines      278193   278193           
  Branches    37159    37160    +1     
=======================================
+ Hits        91889    91894    +5     
+ Misses     158465   158461    -4     
+ Partials    27839    27838    -1     

Files with missing lines	Coverage Δ
Src/FwCoreDlgs/FwNewLangProjectModel.cs	79.59% <100.00%> (ø)

... and 1 file with indirect coverage changes

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[mark-sil]

@mark-sil reviewed 2 files and all commit messages.
Reviewable status: complete! all files reviewed, all discussions resolved (waiting on thejambi).