Multi-column exhibit layouts

[nathanacurtis]

Problem

Props, Modes, and Layout exhibits are always rendered in a single column. For components with many exhibits, this produces very tall specs. The predecessor tool supported 2, 3, or 4 column layouts for these sections.

Solution

Add a column count setting (1, 2, 3, or 4) that controls exhibit layout for Props, Modes, and Layout sections. When set to 2+, exhibits arrange into columns with consistent widths.

Acceptance criteria

• A column count setting is available (1, 2, 3, or 4; default 1)
• Exhibits arrange into the specified number of columns
• Column widths are consistent across all exhibits in a section
• Spec frame width adjusts to accommodate multi-column layout

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Implementation details are tracked internally.