[WIP] Fix generated classes new line for annotations

[Copilot]

• Fix {%- template Class.Annotations -%} → {%- template Class.Annotations %} in Class.liquid (remove trailing - that strips the newline after annotation)
• Fix {%- template Class.Property.Annotations -%} → {%- template Class.Property.Annotations %} in Class.liquid
• Fix {%- template Enum.Annotations -%} → {%- template Enum.Annotations %} in Enum.liquid
• Update DefaultTemplateFactory.cs cleanup: use Replace("\n__EMPTY-TEMPLATE__\n", "\n") to handle empty annotation templates without introducing blank lines
• Add test When_custom_class_and_property_annotation_templates_are_used_then_annotations_are_on_separate_lines to verify fix
• All 212 tests pass (no regressions)

Original prompt

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This section details on the original issue you should resolve

<issue_title>Generated classes miss new line when Annotations are used</issue_title>
<issue_description>When using custom/overriden Class.Annotations.liquid and Class.Property.Annotations.liquid, the result is generated on the same line as the class/property.
This is probably caused by the extra - in

NJsonSchema/src/NJsonSchema.CodeGeneration.CSharp/Templates/Class.liquid

Line 29 in 94647c5

{%- template Class.Annotations -%}

and

NJsonSchema/src/NJsonSchema.CodeGeneration.CSharp/Templates/Class.liquid

Line 100 in 94647c5

{%- template Class.Property.Annotations -%}

introduced in #1346

Class.Annotations.liquid:
[System.Runtime.Serialization.DataContract]

Class.Property.Annotations.liquid:
[System.Runtime.Serialization.DataMember]

The output then looks like this:

</issue_description>

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

• Fixes Generated classes miss new line when Annotations are used #1592

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[lahma]

@copilot retry

[Copilot]

@copilot retry

The fix is already in place and all 212 tests pass (commit 98104d5). Here's a summary of the changes:

Root cause: The trailing -%} in {%- template Class.Annotations -%} strips the newline between the annotation and the class/property declaration.

Changes made:

• Class.liquid: Changed {%- template Class.Annotations -%} → {%- template Class.Annotations %} and {%- template Class.Property.Annotations -%} → {%- template Class.Property.Annotations %}
• Enum.liquid: Changed {%- template Enum.Annotations -%} → {%- template Enum.Annotations %}
• DefaultTemplateFactory.cs: Added .Replace("\n__EMPTY-TEMPLATE__\n", "\n") before the existing catch-all replacement to cleanly handle the empty-annotation case (default templates are empty, and removing -%} would otherwise introduce a blank line)
• Added a test in AnnotationsTests.cs that verifies annotations appear on their own lines

Before (bug): [DataContract]public partial class MyClass
After (fix):

[DataContract]
public partial class MyClass