Root cause: PageLayout's flex-direction: column + gap was not counted in flex: 1 height calculations, causing children to overflow and trigger scroll.
Solution: Convert PageLayout from flexbox to CSS Grid with explicit grid-template-rows. Grid automatically accounts for gaps in row sizing.
Changes:
- PageLayout.vue: display: flex → display: grid
- grid-template-rows: auto auto auto auto 1fr auto auto
- .ks-page__content/.ks-page__aside: height: 100% → flex: 1
- .ks-page__workspace: removed flex: 1 (grid cell, not flex)
Impact:
- models-master fits viewport without page-level scroll ✓
- All screen-types layouts auto-fit with correct height propagation
- Fix applies to all pages using PageLayout
AGENTS.md v16.0: Added Layout Rule #7 (PageLayout grid requirement)
Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>
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