Summary

Implements wrap mode compaction where items flow left-to-right and wrap to the next row, similar to words in a paragraph. This is a v2 reimplementation of the algorithm from PR #1773 by @JohnThomson, adapted to the new composable Compactor interface.

Behavior:

• Items flow left-to-right, wrapping to the next row at the grid edge
• Moving an item earlier in the sequence shifts other items right/down
• Moving an item later in the sequence shifts other items left/up
• Works best with uniformly-sized items (especially 1x1)

Changes:

• Added wrapCompactor and wrapOverlapCompactor to react-grid-layout/extras
• Added "wrap" to the CompactType union type
• Updated sortLayoutItems() to handle wrap type
• 20 new tests covering wrap compaction behavior

Usage

import { wrapCompactor } from 'react-grid-layout/extras';

<GridLayout
  compactor={wrapCompactor}
  layout={layout}
  // ...
/>

Test plan

• All existing tests pass (366 tests)
• New wrap compactor tests pass (20 tests)
• Build succeeds
• Lint passes

Closes #1773