feat(web): blocker-chain tracing as lit path + edge styling by type (TASK-1737) - #705
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…TASK-1737) Selecting a node now answers "why can't this start?" visually: a cycle-safe BFS walks the transitive blocker chain upstream over 'blocks' edges and burns it bright red — chain nodes mix toward the blocks red and are never dimmed, chain edges go full-alpha wide with directional particles flowing blocker→blocked into the selected node. Precedence: chain > pulse > dim for nodes, chain > adjacency > dim for edges. The chain recomputes when a surviving selection's payload or filters change, and clears on deselect. DetailCard grows a red-accented "Blocked by" list (clickable rows fly to the blocker and re-trace its chain; capped at 6 with +N more, chain depth noted when deeper) and a "Blocks N items" stat. supersedes / split-from edges drop to 0.6 alpha to round out per-type styling. Parent: PLAN-1730.
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Summary
PLAN-1730's signature "useful" feature: select any node and its transitive blocker chain lights up as a red path with directional particles flowing toward the selected item.
linkDirectionalParticles(3)flowing source→target (blocker→blocked).Context
Implements
TASK-1737underPLAN-1730. TASK-1738 (gravity-well layout tuning) is the last one standing.Test plan