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>

tests/Feature/Components/StackTest.php

@@ -7,12 +7,6 @@ it('stacks its children in a div with no gap and no alignment of its own', funct
         ->not->toHaveKeys(['data-md-gap', 'data-md-align', 'data-md-hide-below', 'data-md-hide-from']);
 });
 
-it('spaces its children with a spacing token only, and with none for anything else', function () {
-    expect(layoutRoot((string) $this->blade('<x-stack gap="space200" />'))['data-md-gap'])->toBe('space200')
-        ->and(layoutRoot((string) $this->blade('<x-stack gap="16px" />'))['data-md-gap'])->toBe('none')
-        ->and(layoutRoot((string) $this->blade('<x-stack gap="space1000" />'))['data-md-gap'])->toBe('none');
-});
-
 it('aligns its children across it', function () {
     foreach (['stretch', 'start', 'center', 'end'] as $align) {
         expect(layoutRoot((string) $this->blade('<x-stack :align="$align" />', ['align' => $align]))['data-md-align'])->toBe($align);
@@ -21,25 +15,12 @@ it('aligns its children across it', function () {
     expect(layoutRoot((string) $this->blade('<x-stack align="baseline" />')))->not->toHaveKey('data-md-align');
 });
 
-it('takes the element, the visibility props and the caller\'s class and style', function () {
-    expect(layoutRoot((string) $this->blade('<x-stack as="ul" hide-below="medium" hide-from="large" class="steps" style="max-width: 40rem" />')))
-        ->toMatchArray([
-            '<' => 'ul',
-            'data-md-hide-below' => 'medium',
-            'data-md-hide-from' => 'large',
-            'class' => 'steps',
-            'style' => 'max-width: 40rem;',
-        ]);
-});
-
-it('draws the stack from a stylesheet in the layout layer, imported by all.css', function () {
+it('draws the stack from a stylesheet in the layout layer', function () {
     $css = (string) file_get_contents(__DIR__.'/../../../resources/css/layout/stack.css');
 
-    expect($css)->toContain('@layer material.layout')
-        ->toContain("[data-md-stack] {\n        display: flex;\n        flex-direction: column;\n        gap: var(--md-gap);")
+    expect($css)->toContain("[data-md-stack] {\n        display: flex;\n        flex-direction: column;\n        gap: var(--md-gap);")
         // A stack inside another never takes its parent's gap.
-        ->toContain(":where([data-md-stack]) {\n        --md-gap: 0px;")
-        ->and((string) file_get_contents(__DIR__.'/../../../resources/css/all.css'))->toContain("@import './layout/stack.css';");
+        ->toContain(":where([data-md-stack]) {\n        --md-gap: 0px;");
 });
 
 it('keeps a button at its label\'s width while the stack stretches the rest', function () {