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/Support/ComponentStylesheet.php

@@ -53,7 +53,16 @@ final class ComponentStylesheet
 
     public static function path(string $name): string
     {
-        return dirname(__DIR__, 2)."/resources/css/components/{$name}.css";
+        return self::cssPath("components/{$name}.css");
+    }
+
+    /**
+     * resources/css itself, or a path under it — the root every stylesheet test resolves paths
+     * from.
+     */
+    public static function cssPath(string $relative = ''): string
+    {
+        return dirname(__DIR__, 2).'/resources/css'.($relative === '' ? '' : "/{$relative}");
     }
 
     /**
@@ -73,10 +82,33 @@ final class ComponentStylesheet
      */
     public function imports(): array
     {
-        return array_values(array_filter(array_map(
-            fn (string $statement): ?string => preg_match('/^@import\s+([\'"])(.+?)\1;$/', $statement, $match) === 1 ? $match[2] : null,
-            $this->statements,
-        )));
+        return array_values(array_filter(array_map(self::importPath(...), $this->statements)));
+    }
+
+    /**
+     * The file a plain `@import '<path>';` statement names, or null for anything else (a
+     * statement with `layer()`/`supports()`/media after the path, or not an import at all).
+     */
+    public static function importPath(string $statement): ?string
+    {
+        return preg_match('/^@import\s+([\'"])(.+?)\1;$/', $statement, $match) === 1 ? $match[2] : null;
+    }
+
+    /**
+     * The declarations of a flat block body — no nested rule inside it, just `property: value;`
+     * pairs (a `:root` block, a media query's own single nested rule already unwrapped by the
+     * caller). declarations() above is for a selector inside the full, nested stylesheet; this is
+     * for a body a caller already has in hand.
+     *
+     * @return array<string, string>
+     */
+    public static function flatDeclarations(string $body): array
+    {
+        return collect(explode(';', $body))
+            ->map(fn (string $declaration): string => trim($declaration))
+            ->filter()
+            ->mapWithKeys(fn (string $declaration): array => [trim(strstr($declaration, ':', true)) => trim(substr(strstr($declaration, ':'), 1))])
+            ->all();
     }
 
     /**
@@ -240,18 +272,24 @@ final class ComponentStylesheet
         return trim((string) preg_replace('/\s+/', ' ', $text));
     }
 
-    private static function withoutComments(string $css): string
+    /**
+     * `$css` with every comment and quoted string blanked out (the quoted string kept, the comment
+     * dropped) — shared by every test that has to tell a `/* … *\/` in a stylesheet from real CSS.
+     */
+    public static function withoutComments(string $css): string
     {
         return (string) preg_replace('~("(?:\\\\.|[^"\\\\])*"|\'(?:\\\\.|[^\'\\\\])*\')|/\*.*?\*/~s', '$1', $css);
     }
 
     /**
      * The statements and blocks at the top of a piece of CSS. Inside a rule a declaration may end
-     * at the closing brace without a semicolon.
+     * at the closing brace without a semicolon. `$css` must already be comment-free
+     * (withoutComments()) — this does not strip them itself, so a caller walking nested bodies
+     * (already substrings of a stripped source) does not pay for it twice.
      *
      * @return list<array{statement: string}|array{prelude: string, body: string}>
      */
-    private static function items(string $css, bool $declarations = false): array
+    public static function items(string $css, bool $declarations = false): array
     {
         $items = [];
         $start = 0;