Fix XML documentation warnings in generated EmbedFiggleFontAttribute

[Copilot]

When <GenerateDocumentationFile>true</GenerateDocumentationFile> is enabled, projects using Figgle.Generator get two compiler warnings from the always-generated EmbedFiggleFontAttribute.cs:

• CS1734: <paramref name="FiggleFont" /> in the constructor doc — FiggleFont is not a parameter name (memberName and fontName are)
• CS1574: <see cref="FiggleFont" /> in the MemberName summary — FiggleFont type can't be resolved when Figgle.dll is not a direct project reference (the typical setup when using the generator for compile-time-only rendering)

Both occur in EmbedFiggleFontAttribute.cs even when only GenerateFiggleText is used, since both attribute sources are always emitted.

Changes

• In EmbedFontSourceGenerator.cs AttributeSource: replace <see cref="FiggleFont" /> and <paramref name="FiggleFont" /> with <c>FiggleFont</c> — avoids type resolution entirely while preserving the doc intent

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Original prompt

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This section details on the original issue you should resolve

<issue_title>Warnings using GenerateFiggleText from FiggleFont.Generator</issue_title>
<issue_description>Using this code in my application

[GenerateFiggleText(memberName: "Title", fontName: "standard", sourceText: "My text")]
internal static partial class MyBanner { }

there are 2 warnings on building coming from autogenerated code

<My .cproj folder>\obj\Debug\net10.0\Figgle.Generator\Figgle.Generator.EmbedFontSourceGenerator\EmbedFiggleFontAttribute.cs(47,95,47,105): warning CS1574: XML comment has cref attribute 'FiggleFont' that could not be resolved
<My .csproj folder>\obj\Debug\net10.0\Figgle.Generator\Figgle.Generator.EmbedFontSourceGenerator\EmbedFiggleFontAttribute.cs(59,121,59,131): warning CS1734: XML comment on 'EmbedFiggleFontAttribute.EmbedFiggleFontAttribute(string, string)' has a paramref tag for 'FiggleFont', but there is no parameter by that name
</issue_description>

Comments on the Issue (you are @copilot in this section)

@drewnoakes Thanks for reporting this. Will get a fix out.

• Fixes Warnings using GenerateFiggleText from FiggleFont.Generator #52

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