Draw the snackbar host without Tailwind

Plan step 36 (actions). <x-toast> renders data-md-toast with
data-md-position, its snackbar data-md-toast-snackbar with a bound
data-md-two-line, data-md-toast-content with a bound
data-md-toast-wrap, and data-md-toast-action/-dismiss; no class list.
toast.css draws SnackbarTokens' inverse surface, 48/68px container,
the two 40px controls reaching 48px targets with their own state
layer and touch target (ACT-18), the enter transition and the
position-start margin that grows from medium.

data-toast becomes data-md-toast-snackbar and data-toast-action
becomes data-md-toast-action (snackbar.js, navigation.js's
hide-on-scroll guard, NavigationBarTest, CommunicationTest); a new
data-md-toast-dismiss hook names the close button. ToastTest is
rewritten on the hooks and ComponentStylesheet. CommunicationTest
gains the owed tests: an actioned snackbar past the default timeout,
Escape on a focused one, the live region before any message, and the
two-line height with Alt+G reaching the action from elsewhere on the
page.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Qwx5USif3wFFmxtHg5U1g9

resources/js/snackbar.js

@@ -60,7 +60,7 @@ document.addEventListener('alpine:init', () => {
                 // itself, so without one the keyboard cannot reach the action at all. `event.code`
                 // rather than `event.key`, which Alt rewrites to another character on some layouts.
                 if (event.altKey && !event.ctrlKey && !event.metaKey && event.code === 'KeyG') {
-                    const action = this.$el.querySelector('[data-toast-action]')
+                    const action = this.$el.querySelector('[data-md-toast-action]')
 
                     if (action) {
                         event.preventDefault()
@@ -142,7 +142,7 @@ document.addEventListener('alpine:init', () => {
          */
         measure() {
             this.$nextTick(() => {
-                const snackbar = this.$el.querySelector('[data-toast]')
+                const snackbar = this.$el.querySelector('[data-md-toast-snackbar]')
                 const root = document.documentElement.style
 
                 if (snackbar) {