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Miguel Ángel
a388382c76
Adds a dropdown in the studio header bar for switching composition dimensions between common presets (16:9, 9:16, 1:1, 4:5, 4:3, 21:9). Selecting a preset patches data-width/data-height on the root composition element and refreshes the preview. The current ratio is auto-detected from the iframe on load and via stage-size messages.