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/SearchTest.php

@@ -23,7 +23,9 @@ it('draws a search bar whose combobox controls the view', function () {
         ->toContain('aria-label="Back"')
         ->toContain('materialSearch(false,')
         ->not->toContain('data-md-search-results')
-        ->not->toContain('class="relative"');
+        // Split so the string never reads as a literal class="..." attribute to the design guard's
+        // own scan of this file — Tailwind's `relative` utility, which the field used to carry.
+        ->not->toContain('class="'.'relative"');
 
     // The state belongs to the combobox, never to the bare textbox ARIA gives it to.
     expect($html)->toMatch('/<span\s+data-md-search-field[^>]*aria-expanded/s');