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/css/foundation.css

@@ -10,7 +10,8 @@
  * Every rule of the package sits in a sub-layer of `material`, in this order, lowest first:
  *
  *   material.reset       foundation/reset.css — the browser's defaults taken back
- *   material.tokens      foundation/tokens.css — every `--md-sys-*` and `--md-ref-*` property
+ *   material.tokens      tokens/*.css, imported here directly — every `--md-sys-*` and
+ *                        `--md-ref-*` property
  *   material.base        foundation/base.css, foundation/interaction.css — the page, the font
  *                        face, and md-state-layer, md-focus-ring, md-touch-target, md-link
  *   material.layout      the layout components: scaffold, panes, the canonical layouts
@@ -33,7 +34,13 @@
 
 @import './foundation/reset.css';
 @import './foundation/hidden.css';
-@import './foundation/tokens.css';
+@import './tokens/scheme.css';
+@import './tokens/shape.css';
+@import './tokens/elevation.css';
+@import './tokens/motion.css';
+@import './tokens/type.css';
+@import './tokens/state.css';
+@import './tokens/spacing.css';
 @import './foundation/base.css';
 @import './foundation/interaction.css';
 @import './text.css';