Five `0%` / `25%` / `50%` / `75%` / `100%` labels in a new 16 px
row beneath the 1 px scrub track give the player explicit
quarter-mark readouts to pair with the notch ticks.
Pure helper `scrub_notch_labels()` returns the fixed array,
paired index-for-index with `scrub_notch_positions()`. Spawn loop
zips both helpers and applies an "endpoints flush, middle three
percent-anchored" positioning pattern: leftmost label gets
`left: 0` (no clip on `0%`), rightmost gets `right: 0` (no overflow
on `100%`), middle three anchor at `left: Val::Percent(p)` since
Bevy 0.18 UI lacks a clean CSS-style `translate-x: -50%` centering
primitive. The slight right-of-notch offset on the middle three
is visually subtle at TYPE_CAPTION; explicit polish target if
anyone notices.
Banner height grew from 60 → 76 px to make room for the label row
(76 = top row 59 flex-grow + scrub track 1 + label row 16). First
real layout change in B-2's screen-takeover arc — every prior
B-2 commit was additive at fixed banner geometry.
Label color is TEXT_SECONDARY rather than mockup's `text-outline`
(BORDER_SUBTLE) — the latter would match the notches but is too
low-contrast against BG_ELEVATED_HI to read at 12 px. TEXT_SECONDARY
keeps the subdued caption hierarchy while staying legible.
4 new tests: pure-helper guard pinning the array + helper-positions
pairing invariant, spawn cardinality, set equality between spawned
texts and helper output, lifecycle parity with the overlay tree.
Tests: 1232 → 1236 (+4). Clippy clean.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
funman300
d322abf67b