Cut duplicated and speculative code across the package

An over-engineering audit of the whole tree, applied in five reviewed
batches. Behaviour stays the same except where UPGRADE.md says otherwise.

PHP: the showcase and error-page stylesheets are prebuilt into
resources/dist by bin/stylesheets.mjs, through Vite's own postcss-import
(first occurrence kept, the order an application's build gives), instead
of Stylesheets::bundle() inlining imports on every request; only the
import walk DesignGuard needs stays. SchemeStylesheet::withProfiles()
replaces three copies of the scheme-plus-profiles loop, material:scheme
leaves spec and contrast checks to the node script that already made
them, and the error page's scheme cache, the hashed view namespace, the
translations path with no lang/ folder and DesignGuard's 1.x-name hints
are gone.

JS: the androidx shape port progress.js and both bin scripts each carried
lives once in resources/js/shapes.js (the generated SVGs are unchanged);
util.js holds ringIndex(), ms(), reopenGuard() and remember(), which
were written out several times; listeners are released through
AbortController; tooltip.js's hoverPopover() serves the rich tooltip too.

CSS: every rule for an element inside the navigation rail queries
`--md-navigation-rail-value` instead of repeating the seven collapsed
conditions under five media branches; badge, alert, progress, slider and
button read one non-inheriting colour-role table (components/color.css);
the dialog chrome, the submenu's popover chrome, the chip's state layer
and touch target, and the visually-hidden inputs use the shared rules
they copied; foundation/tokens.css is folded into foundation.css.

Views: Support\Field and Support\Link replace the error-key, bound-value
and link-attribute blocks copied into the fields and link components;
the timepicker period group, the menu filter and the showcase head are
partials; the datepicker's steppers and entry fields are loops; component
docblocks no longer restate SKILL.md.

Tests and tooling: one dataset-driven ComponentStylesheetsTest replaces
four per-group files, DesignGuardTest and the layout-component tests use
datasets, browser tests share one ready() helper, CSS parsing lives in
ComponentStylesheet alone. docs/audits and the finding IDs citing it are
removed, as are pestphp/pest-plugin-laravel, the unused composer scripts
and check:font; the lint job runs in the feature job, which now installs
node packages so the prebuilt-stylesheet staleness test runs in CI.

Feature suite 1177 passed, Chrome browser suite 299 passed.

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

resources/views/components/group.blade.php

@@ -49,9 +49,9 @@
 @php
     $model = $attributes->whereStartsWith('wire:model')->first();
     $name ??= $model;
-    // A plain form's field is named, not bound: its errors are under its name (`files[]` → `files`, `a[b]` → `a.b`).
-    $errorKey = $model ?? (filled($attributes->get('name')) ? str_replace(['[]', '[', ']'], ['', '.', ''], (string) $attributes->get('name')) : null);
-    $messages = $errorKey !== null && isset($errors) ? \Illuminate\Support\Arr::flatten($errors->get($errorKey)) : [];
+    $field = \NoNameWeb\LivewireMaterial\Support\Field::class;
+    $errorKey = $field::key($model, $attributes->get('name'));
+    $messages = $field::messages($errors ?? null, $errorKey);
     $size = in_array($size, ['xs', 'sm', 'md', 'lg', 'xl'], true) ? $size : 'sm';
     $variant = in_array($variant, ['tonal', 'filled', 'outlined'], true) ? $variant : 'tonal';
     // M3's "Default shape | Round, square": a square group's ends take the corner its inner edges
@@ -63,14 +63,14 @@
     // Below `medium` a segment draws under 48px, so it needs the foundation's touch target too.
     $segmentNeedsTouchTarget = in_array($size, ['xs', 'sm'], true);
 
-    $root = $attributes->only(['class', 'style', 'wire:key'])->merge(array_filter([
+    $root = $attributes->only(['class', 'style', 'wire:key'])->merge([
         'data-md-group' => true,
         'data-md-size' => $size,
         'data-md-variant' => $variant,
         'data-md-shape' => $shape,
         'data-md-multiple' => $multiple ? true : null,
         'data-md-inline' => $inline ? true : null,
-    ], fn ($value): bool => $value !== null));
+    ]);
 @endphp
 
 <fieldset {{ $root }}>
@@ -82,6 +82,7 @@
         @foreach ($options as $option)
             <label data-md-group-segment class="md-state-layer @if ($segmentNeedsTouchTarget) md-touch-target @endif">
                 <input
+                    class="md-visually-hidden"
                     {{ $attributes->whereStartsWith(['wire:model', 'x-model']) }}
                     type="{{ $multiple ? 'checkbox' : 'radio' }}"
                     name="{{ $multiple ? $name.'[]' : $name }}"