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The PACKET TYPES legend could not be dismissed on Live: clicking the palette toggle did nothing, while document.querySelector('#legendToggleBtn').click() from the console worked. That asymmetry was the diagnosis, since a synthesised click skips hit testing.
Residual half of #1833. That fix corrected the button's offset to calc(var(--vcr-bar-height) + 10px) but left the anchor: .legend-toggle-btn was position: fixed, so the offset resolved against the viewport, while the .vcr-bar it clears is absolute inside .live-page, whose height subtracts --bottom-nav-reserve (56px + safe-area at <=768). The two anchors disagreed by exactly the reserve, dropping the button into the bar's band, and .vcr-bar at z-index 1000 against the button's 500 took every real click. The window is 641-768px: below 641 both buttons are display:none, above 768 the reserve is 0, which is why neither the desktop nor the phone layout test saw it.
Both buttons are now position: absolute, resolving against the same containing block as the bar. .feed-show-btn carried the identical defect but missed the bar by 16px because --legend-toggle-stack parks it a row higher, so that change prevents a break rather than repairs one.
Three review rounds, each verified rather than argued:
- The new E2E was classified in non-unit-tests.json but had no deploy.yml line, so it would never have run (#2037). Now wired in, and it covers both buttons.
- The '.feed-show-btn is display:none at <=768' claim was wrong (it is <=640), which the author measured and corrected.
- Its first real execution failed on its own setup: getComputedStyle().getPropertyValue() on an unregistered custom property returns the unevaluated declaration ('calc(56px + 0px)'), so the non-zero check could not work. It now asserts the measured gap instead, and deliberately does not pin 56 because the gap measures 58 on CI.
Final run: 14 passed, 0 failed. The discriminating assertion is (f), each button's offset net of the bar being identical at 720 and 1440 (11px and 123px slack); under the old anchor those differ by the reserve. (g) pins the desktop layout unmoved.
Merged by the interim maintainer without a second human reviewer: CI and the review above are the independent checks.
Fixes #1833