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-item.blade.php

@@ -40,16 +40,16 @@
         'wire:navigate' => $isLink && ! $external && ! $noWireNavigate && ! $attributes->has('wire:navigate') ? true : null,
         'type' => $isLink ? null : 'button',
         'aria-current' => $active ? 'page' : null,
-        'data-active' => $active ? true : null,
+        'data-md-active' => $active ? true : null,
     ], fn ($value): bool => $value !== null));
 @endphp
 
-<{{ $tag }} data-navigation-bar-item {{ $attributes }}>
-    <span data-navigation-pill>
-        <span data-navigation-indicator>
-            <span class="relative inline-flex">
+<{{ $tag }} data-md-navigation-bar-item {{ $attributes }}>
+    <span data-md-navigation-pill>
+        <span data-md-navigation-indicator>
+            <span data-md-navigation-icon>
                 @if ($icon)
-                    <x-livewire-material::icon :name="$icon" :filled="$active" class="size-6" />
+                    <x-livewire-material::icon :name="$icon" :filled="$active" />
                 @endif
 
                 @if ($dot)
@@ -60,10 +60,10 @@
             </span>
         </span>
 
-        <span data-navigation-label>{{ $label ?? $slot }}</span>
+        <span data-md-navigation-label>{{ $label ?? $slot }}</span>
     </span>
 
     @if ($spoken !== null)
-        <span class="sr-only">, {{ $spoken }}</span>
+        <span class="md-visually-hidden">, {{ $spoken }}</span>
     @endif
 </{{ $tag }}>