Follow-up to #285. Violet sits close to the terminal's own dim foreground,
so the arcs lost contrast exactly where they cross text, which is most of
their length. Blue reads at a glance on the dark skins and on the light
ones.
Colour still comes from a token every skin block already defines and tunes
for its own background (--session-blue instead of --session-purple), so it
stays one rule for all seven skins with no per-skin override, and the two
blues are not even the same: --session-blue is per palette while the
subagent rule hardcodes #3b82f6.
Hue no longer separates this layer from the subagent lines, so the
separation now rests entirely on shape (a lineage arc hangs under the strip
and never reaches a window), weight and dash pattern. Noted in the rule.
CSS only: no geometry, no markup, no settings.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
The lines that join a tab to the workers its codeman skill spawned were
drawn with numbers tuned against two tabs sitting side by side, and they
degraded in exactly the two situations the feature is actually used in.
1. A spawned worker is appended to the END of the strip, so the real span
between a lead and its worker is 800-1500px. With the dip clamped at
44px that is a 33px sag: the arc reads as a straight line drawn across
the terminal instead of a bracket hanging under the strip. The dip now
grows at 0.085/px and clamps at 104.
2. When the desktop strip wraps (tabs-two-rows / tabs-auto-wrap), a parent
on row 1 and its child on row 2 are ~14px apart, and the cross-row
branch drew parent-bottom to child-TOP: a flat line hidden inside the
row gap, with siblings overprinting each other. Both ends now anchor on
the tab BOTTOM with the control points below the LOWER row, so a wrapped
pair gets the same bracket a flat strip gets. That deletes the branch:
one shape covers both.
Visibility, at 1:1 rather than in a zoomed mockup: 2 -> 2.5px stroke,
4 4 -> 5 5 dashes (lineage-flow moves with them, -16 -> -20), opacity
.55 -> .72, and a second wider glow so the contrast comes from the halo
rather than from more weight, keeping the line under the subagent lines'
3px. A working child is bright (.95) outside the reduced-motion block, so
turning motion off no longer also dims every worker's arc. Sibling nesting
6 -> 8px and the direction dot 3 -> 3.5px to match the heavier stroke.
Verified at 1:1 in a harness driving the real styles.css and the real
computeLineagePath over three layouts (adjacent workers, workers at the
far end of a full strip, wrapped two-row strip) on a dark and a light
skin. test/session-lineage-lines.test.ts pins both regressions.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Codeman maintainer