Feat/element opacity#7
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A per-element Opacity slider (0-1) in the styling panel for nodes and edges, folding into the color's alpha so it composes with colors that already carry transparency. Threaded through every node program (SVG texture, border-circle, native circle/square) and the edge stroke. - Scale-by-property (∿) supported via the numeric scale picker - Round-trips through JSON and a new Excel `Opacity` column, documented in the template readme tab - Backward compatible: absent opacity defaults to 1 (fully opaque) - Release: bump to 1.15.5, changelog entry Tests: opacity->alpha across all node programs, edge-color composition, clamp/identity cases, and Excel + scale-picker round-trips.
…-order PNG (toDataURL) and SVG (collectSvgScene) exports painted bubble-set hulls beneath the node/edge mesh, but the live view has drawn them on top (afterLayer: "nodes") since 1.15.1. On dense graphs the edges buried the hulls and also read as more opaque than on screen. Both exporters now composite hulls above nodes/edges and below labels. Sparse graphs were unaffected, so this only showed on large graphs. Added an SVG z-order regression test (node < body < label).
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Adds a per-element Opacity slider (0–1) for nodes and edges in the styling panel, and fixes bubble-group layering in exports.
What's new
Fixes
Compatibility
Backward compatible — absent opacity defaults to 1 (fully opaque); older saved files render identically.
Tests
All 1402 pass. Added coverage for opacity→alpha across every node programmp/identity cases, Excel + scale-picker round-trips, and an SVG exportz-order regression test.