Fix aspectRatio output when value is an object

[nathanacurtis]

Problem

The layout or style output displays aspectRatio incorrectly when the schema represents it as an object (e.g., { width: 16, height: 9 }) rather than a scalar number. The raw object structure appears in the exhibit instead of a readable ratio or value.

Solution

Detect when aspectRatio is an object and format it into a human-readable form — either as a ratio string ("16:9") or a decimal — so exhibits display a clean value.

Acceptance criteria

• aspectRatio displays as a readable value (not a raw object) in plugin exhibits
• Both scalar and object-shaped aspectRatio values are handled without errors

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Implementation details are tracked internally.