LITE Fix - Remove blur on graph lines and graph legend text

[dphugo]

What does this PR do?

The legend text in v2.4.1 is blurry for graphs, other than the bottom one as can be seen here:

Here the axis text and some of the bounding box lines are blurry:

After the change is applied the legend text of the top graph is no longer blurry:

The axis text and bounding box lines are no longer blurry:

Which component(s) does this affect?

• Full Dashboard
• Lite Dashboard
• Lite Tests
• SQL collection scripts
• CLI Installer
• GUI Installer
• Documentation

How was this tested?

• SQL Server version(s) tested against: SQL Server 2022
• Steps to verify the change works: I've toggled the code during a debug session to visually verify that the blur disappears when code is added.

Checklist

• I have read the contributing guide
• My code builds with zero warnings (dotnet build -c Debug)
• I have tested my changes against at least one SQL Server version
• I have not introduced any hardcoded credentials or server names

[erikdarlingdata]

Looks good — clean, minimal fix for a real visual issue.

• Covers all 4 XAML files that reference ScottPlot (MainWindow.xaml hosts ServerTab.xaml with the chart, plus the 3 history windows). Nothing missed.
• TextFormattingMode="Display" + UseLayoutRounding="True" is the standard WPF fix for subpixel blur on text and lines. Both properties inherit down the visual tree, so setting them on the Window is the right place.
• No side effects to non-chart content.

Nice screenshots in the PR description too — the before/after difference is clear. Thanks for the contribution!