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/slider.js

@@ -83,7 +83,6 @@ const TICK_MIN_SPACING = 8
 const TOUCH_SLOP = 8
 
 const VALUE = Object.getOwnPropertyDescriptor(HTMLInputElement.prototype, 'value')
-const VALUE_AS_NUMBER = Object.getOwnPropertyDescriptor(HTMLInputElement.prototype, 'valueAsNumber')
 
 const clamp = (value, min, max) => Math.min(Math.max(value, min), max)
 const near = (a, b) => Math.abs(a - b) < 1e-6
@@ -206,6 +205,7 @@ function slider(root) {
     const drawing = root.querySelector('[data-md-slider-drawing]')
     const range = inputs.length > 1
     const cleanups = []
+    const controller = new AbortController()
     let queued = false
     let release = null
     // Focus this script gave an input on a press, which draws no ring until a key is pressed.
@@ -214,8 +214,7 @@ function slider(root) {
     let spaceHeld = false
 
     const listen = (target, type, handler, capture = false) => {
-        target.addEventListener(type, handler, capture)
-        cleanups.push(() => target.removeEventListener(type, handler, capture))
+        target.addEventListener(type, handler, { capture, signal: controller.signal })
     }
 
     /** The inputs' min, max and step, as a native range reads them; `step` is null for `any`. */
@@ -379,25 +378,20 @@ function slider(root) {
     const pressed = (index) => drawing?.querySelectorAll('[data-md-slider-handle]').forEach((thumb, i) => thumb.toggleAttribute('data-md-pressed', i === index))
 
     inputs.forEach((input) => {
-        // A value written by script fires no event: catch it on the input's own setters.
-        for (const [property, descriptor] of [['value', VALUE], ['valueAsNumber', VALUE_AS_NUMBER]]) {
-            Object.defineProperty(input, property, {
-                configurable: true,
-                get() {
-                    return descriptor.get.call(this)
-                },
-                set(value) {
-                    descriptor.set.call(this, value)
-                    schedule()
-                },
-            })
-        }
-
-        cleanups.push(() => {
-            delete input.value
-            delete input.valueAsNumber
+        // A value written by script fires no event: catch it on the input's own setter.
+        Object.defineProperty(input, 'value', {
+            configurable: true,
+            get() {
+                return VALUE.get.call(this)
+            },
+            set(value) {
+                VALUE.set.call(this, value)
+                schedule()
+            },
         })
 
+        cleanups.push(() => delete input.value)
+
         listen(input, 'focus', () => showFocus(input, focusedByPointer !== input && input.matches(':focus-visible')))
         listen(input, 'blur', () => {
             focusedByPointer = null
@@ -510,6 +504,7 @@ function slider(root) {
     return {
         destroy() {
             release?.()
+            controller.abort()
             cleanups.forEach((cleanup) => cleanup())
         },
 
@@ -613,17 +608,17 @@ function slider(root) {
                 })
             }
 
+            const dragController = new AbortController()
+
             release = () => {
-                window.removeEventListener('pointermove', move)
-                window.removeEventListener('pointerup', end)
-                window.removeEventListener('pointercancel', end)
+                dragController.abort()
                 pressed(null)
                 release = null
             }
 
-            window.addEventListener('pointermove', move)
-            window.addEventListener('pointerup', end)
-            window.addEventListener('pointercancel', end)
+            window.addEventListener('pointermove', move, { signal: dragController.signal })
+            window.addEventListener('pointerup', end, { signal: dragController.signal })
+            window.addEventListener('pointercancel', end, { signal: dragController.signal })
 
             if (dragging) {
                 follow(start)