Close only the topmost layer on Escape, and keep a layer opened over a sheet readable

A modal side sheet, bottom sheet or the modal rail closed on any Escape
the window heard, so a dialog opened from a sheet, a menu, select list
or searchable choice inside one, a sheet opened from a sheet, and a
sheet inside a dialog each closed two layers on one press. And a dialog
or a second sheet rendered elsewhere on the page sat inside the
`aria-hidden` the first sheet's `x-trap.inert` put on its siblings, so a
screen reader could not read it, while the sheet's focus trap took every
Tab inside the dialog back to the inert sheet.

resources/js/layers.js adds `x-layer`, on each of those panels beside
its `x-trap`. An Escape is the panel's only when nothing has handled it
and the nearest open layer around its target is the panel itself - not
an open dialog, popover or customizable select, nor a panel inside it;
the panel claims it with preventDefault(), which also keeps a dialog
around it from cancelling, and dispatches `material-escape`, which the
views close on. A panel that opens lifts `aria-hidden` from its own
ancestors and puts it back on close only where a panel still open hides
them; materialShowModal() does the same for `<x-modal>`, whose new
`x-trap.noautofocus.noreturn` pauses the sheet's focus trap while it is
open and moves no focus of its own. The searchable choice, the search
view and the supporting pane's sheet now preventDefault() the Escape
they act on, so the dialog or sheet around them stays.

Four browser tests stack the layers every way above and fail without
the change in Chrome.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

resources/boost/skills/livewire-material-development/SKILL.md

@@ -583,6 +583,8 @@ Props: `title`, `subtitle`, `icon` (centred hero icon), `separator` (draw the di
 
 An M3 side sheet, bound like `<x-modal>`; `close()` in scope. Props: `title`, `subtitle`, `separator`, `side` (`end` default, `start`; mirrored in RTL), `width` (`400px`), `with-close-button` (**default true** — M3 requires a close affordance; `:with-close-button="false"` is ignored when Escape or the scrim is off, or on a `standard` sheet), `close-on-escape` (default true), `without-backdrop-close`, `actions` slot (**left**-aligned in a 72dp row, which is what the side-sheet spec says; a dialog's are trailing-aligned). For the second pane of a list-detail layout use `<x-list-detail>` instead — `<x-drawer>` no longer has a `pane` prop. Its body is a size container — lay out inside it with a container query in your own CSS (`@container (width >= 28rem)`), never a window size class.
 
+Modal surfaces stack: a `<x-modal>`, menu, select or searchable choice opened inside or over a modal side sheet, bottom sheet or the modal rail — or one sheet opened from another, nested or rendered elsewhere on the page — takes its own Escape, so one press closes one layer, and the layer on top stays readable to a screen reader while the sheet under it keeps the rest of the page hidden. Render the dialog wherever suits the page; nothing needs to be moved inside the sheet.
+
 `standard` is M3's other side-sheet variant: supplementary content beside the primary content — filters, details, a list of actions — co-planar from `expanded`, flat on `surface` with 0dp elevation and no corner, the window's full height, an outline-variant rule down its inner edge instead of a scrim, nothing inert and no focus trap. Below `expanded` it is the modal sheet. Capped at M3's 400dp whatever `width` says, and it always draws the close button. Render it beside its content in a row that only lays out side by side from `expanded` (`<x-supporting-pane>`, or a caller's own row).
 
 ### `<x-bottom-sheet>`