Five 1px vertical ticks at 0/25/50/75/100% give the player visual
anchor points for "where am I, relative to the quarter-marks of the
replay" without needing to mentally bisect the bar.
Pure helper `scrub_notch_positions()` returns the fixed array; the
spawn loop sits next to the WIN MOVE marker spawn so the two
overlays share their lifecycle with the rest of the overlay tree.
Notches paint in BORDER_SUBTLE (same as the unfilled track) and
extend vertically past the 1px track (5px tall, anchored 2px above
the track top) — same visibility trick the WIN MOVE marker uses.
Spawned after the WIN MOVE marker so a notch and the marker landing
on the same percentage paint the marker on top.
Mirrors the notch ladder in the screen-takeover mockup at
docs/ui-mockups/replay-overlay-mobile.html. First finite step toward
B-2's screen-takeover layout reflow; labels under each notch land in
a follow-up commit when the banner height grows to accommodate them.
4 new tests: pure-helper guard pinning the [0,25,50,75,100] array,
spawn-cardinality matching helper.len(), lifecycle parity with the
overlay tree, independence from win_move_index.
Tests: 1228 → 1232 (+4). Clippy clean.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
funman300
fe68861e10