The section_map plugin pins a ~20px clickable bar (#section-map, z-index:5)
to the top of #player. The v3 left-rail hover-catcher (.v3-railzone::before)
is full-height at z-index:30 with pointer-events:auto, so its top-left
corner swallowed every click on the section map's first section — the
left-most section was never clickable on the v3 desktop (macOS/Windows) UI.
Drop the catcher below the 20px bar when the section map is present,
mirroring the existing #section-map ~ #player-hud special-case in
static/style.css. The rail still reveals from anywhere below the bar.
Adds a Playwright regression test (hit-test of the top-left corner) with a
negative control that re-raises the catcher to reproduce the bug.
Fixes#616
Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
