Fix: Result.Preview.Description is not ignored anymore

[Heck-R]

According to the Result.Preview.Description (PreviewInfo.Description) documentation

/// <summary>
/// Result description text that is shown at the bottom of the preview panel.
/// </summary>
/// <remarks>
/// When a value is not set, the <see cref="SubTitle"/> will be used.
/// </remarks>

However, it actually doesn't do anything.
This PR fixes this, so the Description does what it is documented to do.
I left the related TextBlock control name as PreviewSubTitle, because although this is confusing, changing it could break user themes.

[coderabbitai]

📝 Walkthrough

Walkthrough

The changes move subtitle display logic from directly binding to Result.SubTitle to using a new property DefaultPreviewCustomDescription that conditionally returns the preview description when available, otherwise falls back to the subtitle.

Changes

Cohort / File(s)	Summary
Preview subtitle binding refactor Flow.Launcher/MainWindow.xaml	Updated PreviewSubTitle Text binding from Result.SubTitle to DefaultPreviewCustomDescription
New ViewModel property Flow.Launcher/ViewModel/ResultViewModel.cs	Added public read-only property DefaultPreviewCustomDescription returning Result.Preview?.Description ?? Result.SubTitle

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~5 minutes

• Straightforward property addition with simple conditional logic
• Minimal binding change in XAML with no layout or structural modifications

Suggested reviewers

• jjw24

Pre-merge checks and finishing touches

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%.	You can run @coderabbitai generate docstrings to improve docstring coverage.

✅ Passed checks (2 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title accurately describes the main fix: making Result.Preview.Description work as documented instead of being ignored.
Description check	✅ Passed	The PR description clearly explains the issue (Result.Preview.Description not being displayed despite documentation) and the fix (binding the UI to DefaultPreviewCustomDescription to honor the documented behavior).

✨ Finishing touches

• 📝 Generate docstrings

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment

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