logan
02e2251bb2
The bottom sheet's body has scrolled since #60 and said nothing about it. Measured at 424x439, the track list's menu ended at y=470 with the fold at 439 — reachable, since the body is `overflow-y: auto`, but with no affordance saying so, and worst where the cut lands on a row boundary and the sheet ends in a clean edge that reads as the end of the list. The cap stays: `menu-surface`'s own comment says a surface covering the whole screen is a page, not a sheet. What changes is that the body draws a fade, from two background layers whose *attachments* are the feature — a shadow pinned to the box (`scroll`) under a cover of the sheet's own colour painted at the end of the content (`local`), which scrolls up over the shadow exactly when there is nothing more to see. So the fade is absent on a menu that fits, present the moment one does not, and gone again at the end of the list, with no scroll listener and nothing reaching into `wa-dialog`'s shadow root for the scroller. `background-attachment` is Chrome 4; the reference device is Chrome 113. The other two options in the report — a shortened last row, or a max height that makes the cut obvious — both need `height mod 48`, which CSS cannot express, and the observed case is exactly the one where the cut already lands on a row boundary. The curve is steep rather than linear because the rows under it stay live: a scrim over a menu item is that item's text surface, so the 4.5:1 rule reaches it, and the light ramp is what makes that real. A 48px linear scrim at 0.8 greyed the last label to 5.0:1; 32px already down to a quarter strength at 14px measures 9.9:1 there and spends its weight on the strip below it. The test asserts the pair of attachments rather than the pixels, on this file's existing grounds that no tier here renders like the device — it fails on the pre-fix stylesheet with `expected 'scroll' to be 'local, scroll'`. The rendered result was measured in the harness and is recorded in `.planning/NOTES.md`. Closes #207