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/SupportingPaneTest.php

@@ -50,23 +50,11 @@ it('docks the supporting pane as a bottom sheet below expanded, opened by its ha
         ->and(layoutRoot((string) $this->blade('<x-supporting-pane compact="drawer" />'))['data-md-compact'])->toBe('below');
 });
 
-it('takes the element, the visibility props and the caller\'s class and style', function () {
-    expect(layoutRoot((string) $this->blade('<x-supporting-pane as="main" hide-from="extra-large" class="editor" style="min-height: 20rem" />')))
-        ->toMatchArray([
-            '<' => 'main',
-            'data-md-hide-from' => 'extra-large',
-            'class' => 'editor',
-            'style' => 'min-height: 20rem;',
-        ]);
-});
-
-it('places the supporting pane at M3\'s widths from expanded, in the layout layer', function () {
+it('places the supporting pane at M3\'s widths from expanded', function () {
     $css = (string) file_get_contents(__DIR__.'/../../../resources/css/layout/supporting-pane.css');
 
-    expect($css)->toContain('@layer material.layout')
-        ->toContain("@media (width >= 840px) {\n            grid-template-columns: minmax(0, 1fr) 360px;")
+    expect($css)->toContain("@media (width >= 840px) {\n            grid-template-columns: minmax(0, 1fr) 360px;")
         ->toContain("@media (width >= 1200px) {\n            grid-template-columns: minmax(0, 1fr) 412px;")
         ->toContain("[data-md-supporting-pane][data-md-width='split'] {\n            grid-template-columns: minmax(0, 2fr) minmax(0, 1fr);")
-        ->toContain('inset-block-end: max(var(--material-bottom-bar, 0px), var(--material-safe-bottom, env(safe-area-inset-bottom)));')
-        ->and((string) file_get_contents(__DIR__.'/../../../resources/css/all.css'))->toContain("@import './layout/supporting-pane.css';");
+        ->toContain('inset-block-end: max(var(--material-bottom-bar, 0px), var(--material-safe-bottom, env(safe-area-inset-bottom)));');
 });