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/ScaffoldTest.php

@@ -197,15 +197,11 @@ it('stacks the actions row into a column through every branch a collapsed rail c
 
     $css = scaffoldCss();
 
-    // The three width-independent branches share one :where() group; the four width-gated ones
-    // each keep their own @media block, since CSS cannot merge different queries — the same shape
-    // navigation-rail.css's own rewrite gave its internal parts.
+    // The actions row is always inside a rail, never the rail element itself, so it reads the
+    // rail's published value with one style container query instead of copying every branch a
+    // collapsed rail can take.
     expect($css)
-        ->toContain("&:where(\n            [data-md-navigation-rail='collapsed'] *,\n            [data-rail='collapsed'] [data-md-navigation-rail='collapsible']:not([data-md-open]) *,\n            [data-md-navigation-rail='modal']:not([data-md-open]) *\n        ) {\n            flex-direction: column;\n        }")
-        ->toContain("@media (width < 600px) {\n            &:where([data-md-navigation-rail='collapsible']:not([data-md-open]) *) {\n                flex-direction: column;\n            }\n        }")
-        ->toContain("@media (width < 840px) {\n            &:where([data-md-navigation-rail='adaptive']:not([data-md-open]) *) {\n                flex-direction: column;\n            }\n        }")
-        ->toContain("@media (width >= 840px) {\n            @media (width < 1200px) {\n                &:where(:is([data-rail='collapsed'], [data-rail-auto]) [data-md-navigation-rail='adaptive']:not([data-md-open]) *) {\n                    flex-direction: column;\n                }\n            }\n        }")
-        ->toContain("@media (width >= 1200px) {\n            &:where([data-rail='collapsed'] [data-md-navigation-rail='adaptive']:not([data-md-open]) *) {\n                flex-direction: column;\n            }\n        }");
+        ->toContain("@container style(--md-navigation-rail-value: collapsed) {\n            flex-direction: column;\n        }");
 });
 
 it('places each slot once', function () {
@@ -264,8 +260,7 @@ it('marks the scaffold, and draws the FAB after the page\'s bar and before the p
 it('places the FAB at the bottom-end corner, clear of the bar and of a snackbar, in the layout layer', function () {
     $css = scaffoldCss();
 
-    expect($css)->toContain('@layer material.layout')
-        ->toContain('--md-scaffold-fab-margin: var(--md-sys-measurement-space200);')
+    expect($css)->toContain('--md-scaffold-fab-margin: var(--md-sys-measurement-space200);')
         ->toContain("@media (width >= 600px) {\n            --md-scaffold-fab-margin: var(--md-sys-measurement-space300);")
         ->toContain('max(var(--material-bottom-bar, 0px), var(--material-safe-bottom, env(safe-area-inset-bottom)))')
         ->toContain('+ var(--material-snackbar-height, 0px)')
@@ -273,8 +268,7 @@ it('places the FAB at the bottom-end corner, clear of the bar and of a snackbar,
         // The content region already has the window margin, so a pane inside draws none.
         // Only the region's own <main>: one an application nests in the page takes none of this.
         ->toContain("[data-md-scaffold-content] > main {\n        --md-layout-margin: 0px;")
-        ->not->toContain('[data-md-scaffold] main')
-        ->and((string) file_get_contents(__DIR__.'/../../../resources/css/all.css'))->toContain("@import './layout/scaffold.css';");
+        ->not->toContain('[data-md-scaffold] main');
 });
 
 it('imports the stylesheets of the navigation rail, the navigation bar and the snackbar host', function () {