FEAT-337: Page d’accueil : migrer de React-Page vers Puck - étape 5: converter parity, mobile rendering fixes, stretch correctness

JulesLecuirrequested to merge
post-migration-fixes into master

📃 TICKET NOTION 📃

Summary

  • Conversion parity: the legacy→Puck converter now reproduces legacy rendering on migrated pages — background cells keep their own margins/background, spacers become styled Dividers, borders only materialize with a color, mode defaults match the old editor.
  • Mobile rendering fixes: page-width inflation from grid columns gone, oversized horizontal margins clamped (others untouched), long words wrap inside painted blocks, Big/Large/Huge text sizes reduced on small screens.
  • Stretch correctness: painted blocks stretch to column height only when alone in their column — multiple colored blocks per column no longer get forced to equal heights.
  • Editor warnings: horizontal-margin overflow warning (>50px on mobile) actually renders and covers padding; broken-image URLs no longer leak into alt text; background images default to cover/center.
Edited by JulesLecuir

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