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/js/field.js

@@ -23,14 +23,21 @@ function grow(textarea) {
     textarea.style.height = `${textarea.scrollHeight + textarea.offsetHeight - textarea.clientHeight}px`
 }
 
+/** `root` itself, if it matches `selector`, together with its matching descendants. */
+function matching(root, selector) {
+    const descendants = [...root.querySelectorAll(selector)]
+
+    return root instanceof Element && root.matches(selector) ? [root, ...descendants] : descendants
+}
+
 function growAll(root) {
     if (! growsByItself) {
-        root.querySelectorAll(GROWING).forEach(grow)
+        matching(root, GROWING).forEach(grow)
     }
 }
 
 function markAll(root) {
-    root.querySelectorAll(MIXED).forEach((input) => (input.indeterminate = true))
+    matching(root, MIXED).forEach((input) => (input.indeterminate = true))
 }
 
 if (! growsByItself) {
@@ -63,13 +70,8 @@ new MutationObserver((records) => {
                 continue
             }
 
-            for (const input of [node, ...node.querySelectorAll(MIXED)].filter((element) => element.matches(MIXED))) {
-                input.indeterminate = true
-            }
-
-            if (! growsByItself) {
-                ;[node, ...node.querySelectorAll(GROWING)].filter((element) => element.matches(GROWING)).forEach(grow)
-            }
+            markAll(node)
+            growAll(node)
         }
     }
 }).observe(document.documentElement, {