The prototype runs three horizontal padding tiers (t4): 20px for
section titles/eyebrows (lines 153, 254, 299, 511), 16px for cards
(lines 327, 512, 610), 12px for background-less list rows (lines 174,
226, 301). The build had collapsed all three into a single
PluriLayout.horizontal = 16, used everywhere regardless of context.
Add PluriLayout.titleHorizontal (20) and PluriLayout.rowHorizontal
(12) alongside the existing `horizontal` (16, unchanged -- it already
covers the card tier). horizontal keeps every one of its ~30 existing
call sites unchanged.
Committed ahead of S2 (item 6 in this pass) because that item's
PluriRootHeader edit reuses titleHorizontal/rowHorizontal for the
header's own padding, matching the prototype's own header spec exactly
(e.g. Alarmas padding:0 12px 0 20px) -- a real dependency, not just
numbering.
S5, Tier 1 visual-fidelity pass (audit id 2521).
FreeTLab
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