Draw the navigation bar and bar item without Tailwind

Plan step 36 (navigation group, second batch): <x-navigation-bar>'s and
<x-navigation-bar-item>'s class lists move into
resources/css/components/navigation-bar.css and navigation-bar-item.css,
keyed on data-md-navigation-bar (data-md-tall, data-md-hide-on-scroll/
-hidden) and data-md-navigation-bar-item (data-md-active), both in
material.components. The indicator's growing fill and its state layer,
shared with the rail's item, move into a new navigation-item.css both
files import — the day's own layer in datepicker.css is the precedent
for keeping it out of the shared foundation classes: the element
focused and pressed is the whole item, the layer drawn only on the
smaller indicator or pill inside it, which md-state-layer cannot do and
:focus-visible never matches. The wash colour moves from a dead
on-surface base overridden by both items to a shared on-secondary-
container declaration, and its opacities from literal 0.08/0.1 to
state.css's own tokens — no visible change, since the numbers matched.

Every size is px (16dp Tailwind quirks aside, this file had none); the
bar's own item-count and container-query layout, N-08's label-medium
fix and N-19's on-secondary-container wash already matched the audit,
so only hooks, units and layer needed to change.

The scaffold's hide-on-scroll offset rule (`--material-bottom-bar`,
navigation-bar.css) stays unlayered: <x-scaffold> still publishes that
variable with a Tailwind utility until its own rewrite, and a rule in
any layer loses to it regardless of specificity — unlike the FAB
overrides the rail commit moves into material.components, which only
have to beat another material.components rule.

navigation.css is not deleted yet (still Tailwind's for the rail); its
"Navigation" comment in tailwind.css narrows as each stream leaves.
navigation-bar.css is not in NavigationStylesheetsTest.php's dataset:
its one unlayered rule breaks that test's "every block is
material.components" assumption, so the same checks are in
NavigationBarTest.php instead, the same reason ErrorPagesTest.php
carries error-page.css's.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Qwx5USif3wFFmxtHg5U1g9

resources/views/components/navigation-bar.blade.php

@@ -40,7 +40,7 @@
      NavigationBarVerticalItemTokens.kt, NavigationBarHorizontalItemTokens.kt and
      ShortNavigationBar.kt, all under
      https://github.com/androidx/androidx/tree/androidx-main/compose/material3/material3/src/commonMain/kotlin/androidx/compose/material3
-     — the styles are resources/css/components/navigation.css. --}}
+     — the styles are resources/css/components/navigation-bar.css. --}}
 
 @props([
     'label' => null,
@@ -50,17 +50,17 @@
 
 <nav
     aria-label="{{ $label ?? __('Main') }}"
-    data-navigation-bar
-    @if ($tall) data-tall @endif
+    data-md-navigation-bar
+    @if ($tall) data-md-tall @endif
     @if ($hideOnScroll)
-        data-hide-on-scroll
+        data-md-hide-on-scroll
         x-data="materialNavigationBar"
-        x-bind:data-hidden="away ? '' : null"
+        x-bind:data-md-hidden="away ? '' : null"
         x-on:focusin="show()"
     @endif
     {{ $attributes }}
 >
-    <div data-navigation-bar-items>
+    <div data-md-navigation-bar-items>
         {{ $slot }}
     </div>
 </nav>