feat(flow): viewport-aware SGCR adaptive spacing (Phase 2/6) - #289
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…ault plan)
SGCR receives the container's measured size and adapts spacing to fit:
- New `viewport?: {width, height}` on SGCROptions (types.ts)
- `adaptSpacing()` in layout.ts: when the initial layout exceeds the
viewport by >15%, computes a scale factor (floored at 0.4) and re-runs
with tighter spacing (nodeGap ≥12, channelMargin ≥6, minChannel ≥14,
trackPitch ≥10, margin ≥8). One retry only. portInset NOT scaled
(load-bearing for P5/P8).
- SgcrFlowInner passes wrapRef.clientWidth/Height as the viewport to
layoutSGCR. On significant container resize (>15%), the ResizeObserver
triggers a full re-layout with new viewport dimensions (not just refit).
- 200-graph fuzz with viewport {300,200} all pass checkInvariants.
728 viewer tests pass (+3 viewport-adaptive). tsc strict clean.
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Phase 2: SGCR receives the container size and adapts spacing to fit. adaptSpacing() computes a scale factor and re-runs with tighter spacing when the layout overflows the viewport by >15%. 200-graph invariant fuzz with small viewports clean. 728 tests, tsc clean.