feat: iframe/youtube/codepen apply 16:9 sizing in preview panel#150
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…depen Add a general iframe component (title/source props) rendered at 100% container width with a 16:9 aspect ratio. Apply the same responsive sizing to custom youtube and codepen components, overriding SeeMark's fixed-dimension defaults. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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jamliaoo
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Jun 29, 2026
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Goal
設計師希望 iframe 類型內容，在 preview panel 內顯示時，可以維持寬高 16:9（aka Tailwind
aspect-video）的比例，且寬不超過整個 preview 區域。討論：
https://docs.google.com/document/d/1o80SD1jfOYbKEKcX0WodZ-PL8xgvA8Xii2GAVOXJzYc/edit?tab=t.0#heading=h.65w61zh43oa0
https://coseeing.slack.com/archives/C0AABUFUQ01/p1780557641609349?thread_ts=1779198395.123149&cid=C0AABUFUQ01
Before
寬高固定，因此 preview 區域太小時會破版
After