Function computeLayout

computeLayout(rows: TaskNode[], mapper: PixelMapper): Map<number, BarLayout>
Computes pixel-space layout for all visible task rows. Returns a map keyed by task id for O(1) lookup during link routing.
Parameters
- rows: TaskNode[]
  The flattened, visible TaskNode rows.
- mapper: PixelMapper
  The PixelMapper for coordinate conversion.
Returns Map<number, BarLayout>
A Map from task ID to its computed BarLayout.
- Defined in src/lib/timeline/layoutEngine.ts:42