Fix layout displays for updated schema property names

[nathanacurtis]

Problem

The layout section output displays incorrect or missing annotations because it references property names and value types that have been updated in recent schema changes. For example, old alignment, wrap, spacing, and positioning property names are still used in the layout output code.

Solution

Update the layout output to use the current schema property names and value types. Alignment labels, spacing markers, and positioning properties should all reflect the latest schema definitions.

Acceptance criteria

• Layout annotations use current property names (e.g., mainAxisAlignment not the old name)
• Wrap is handled as a boolean value
• Item spacing handles both scalar and bi-axial formats
• Positioning properties use the current schema names
• Layout exhibits generate without errors for horizontal, vertical, and wrapping layouts

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Implementation details are tracked internally.