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fix(ui): draw session lineage lines in blue for contrast

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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>
This commit is contained in:
Codeman maintainer
2026-08-14 10:03:10 +02:00
parent 5ae54536cb
commit 62b0039dc5
2 changed files with 23 additions and 10 deletions
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docs/session-lineage-lines-plan.md
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@@ -158,10 +158,14 @@ callers are cheap. Needed:
### 4.5 Styling
`.connection-line.lineage-line`: violet stroke from a `--lineage-line` token,
`.connection-line.lineage-line`: blue stroke from the per-skin `--session-blue` token
(violet until 2026-08-14, changed because it lost contrast against the terminal's own
dim foreground the moment the arc crossed text),
`stroke-width: 2.5`, `dasharray 5 5`, `opacity: .72` (`.95` while the child works),
softer than the subagent lines so the two layers read as different things, but the
contrast comes from a **second, wider glow** rather than more weight, because the first
softer than the subagent lines so the two layers still read as different things now that
hue no longer separates them (shape does most of that work: a lineage arc hangs under the
strip and never reaches a window), but the contrast against the terminal comes from a
**second, wider glow** rather than more weight, because the first
cut (2px / `4 4` / `.55` / one 5px glow) disappeared into terminal text on a real 1080p
desktop. `lineage-flow` marches by two dash cycles, so it moves with the dash array
(`5 5` → `-20`). Trap to respect: the skin block nests under