Two playability bugs in the new flat-cards layout:
1. On first load or fresh org import a parent had no explicit width or
height, so children whose stored position sat inside their (eventual)
parent's rectangle rendered visually outside the smaller default
parent box. Compute a parent starting size in canvas-topology:
• 2-column grid of child-default footprints + header/side padding
• Grows per child count (2→1 row, 3-4→2 rows, etc.)
and stamp it onto the Node's width/height so the first paint already
contains every child.
2. If a child's stored relative position actually falls outside the
parent's computed bounds (legacy org-imports at 0,0, pre-refactor
absolute coordinates, manually-nudged rows), assign that child a
deterministic default grid slot inside the parent instead.
Runtime cascade: added growParentsToFitChildren to onNodesChange so when
the user drags or resizes a child past the parent's current bounds, the
parent grows to contain it (+padding). Miro/FigJam-style frame auto-fit
— grow-only, never shrinks under the user's manual resize.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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