next.js

086294e2 - docs: add layout stability guidance for videos and iframes (#98070)

docs: add layout stability guidance for videos and iframes (#98070) ## Summary - Document how dimensions and poster images keep video layouts stable while media loads. - Add equivalent sizing guidance for lazy-loaded iframes. ## Verification - `prettier --check docs/01-app/02-guides/videos.mdx` <!-- NEXT_JS_LLM_PR -->