Prove no Tailwind utility class remains in resources/ or tests/

StylesheetsTest.php's new test runs DesignGuard's own family table (check
(i)) over resources/views, resources/js, src, tests/Browser and
tests/Feature — the guard turned on the package's own source, so the two
never drift apart. tests/Feature/DesignGuardTest.php and
tests/Fixtures/design-guard/ carry Tailwind on purpose and are left out.

The scan found Tailwind-shaped class strings used as caller classes in 21
test files (a component test proving a caller's class lands on the root or
a caller's size wins, mostly), left over from before Tailwind cleared the
whole stack: replaced with neutral application-style names (`app-hero-icon`)
or, where one already carries the right meaning, an `md-*` class
(`md-text-end`, `md-ink-warning`). BreakpointsTest.php's own heredoc probe —
which needs a genuine Tailwind-shaped breakpoint prefix to prove its
detection works — now builds that one string from a placeholder at runtime,
so its own source stays clean for this same scan.

Plan step 42 (Phase F), Part A.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Qwx5USif3wFFmxtHg5U1g9

tests/Feature/Components/ShapeTest.php

@@ -25,8 +25,8 @@ it('draws every shape as one path in the text colour, filling a 100-unit box', f
 });
 
 it('renders a shape hidden from assistive tech', function () {
-    $this->blade('<x-shape name="cookie-9" class="size-20 text-secondary-container" />')
-        ->assertSee('<svg data-md-shape="data-md-shape" aria-hidden="true" focusable="false" class="size-20 text-secondary-container" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"', false);
+    $this->blade('<x-shape name="cookie-9" class="app-badge-shape" />')
+        ->assertSee('<svg data-md-shape="data-md-shape" aria-hidden="true" focusable="false" class="app-badge-shape" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"', false);
 });
 
 it('draws the size it is given', function () {