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/FieldTest.php

@@ -72,10 +72,10 @@ it('pairs the error colours with a trailing error icon', function () {
 });
 
 it('puts icons, affixes and the size on the field, and every other attribute on the input', function () {
-    $html = (string) $this->blade('<x-input label="Price" icon="payments" icon-right="info" prefix="CHF" suffix="per month" size="sm" type="number" min="0" class="w-40" mono readonly />');
+    $html = (string) $this->blade('<x-input label="Price" icon="payments" icon-right="info" prefix="CHF" suffix="per month" size="sm" type="number" min="0" class="app-price-field" mono readonly />');
 
     expect($html)
-        ->toMatch('/<div\s+data-md-field\s+data-md-variant="outlined"\s+data-md-size="sm"\s+data-md-mono\s+class="w-40" data-md-readonly="" data-md-input="data-md-input"\s*>/')
+        ->toMatch('/<div\s+data-md-field\s+data-md-variant="outlined"\s+data-md-size="sm"\s+data-md-mono\s+class="app-price-field" data-md-readonly="" data-md-input="data-md-input"\s*>/')
         ->toContain('<span data-md-field-affix>CHF</span>')
         ->toContain('<span data-md-field-affix>per month</span>')
         ->toContain('type="number"')
@@ -205,14 +205,14 @@ it('lays out a form with its actions under an optional divider', function () {
     $html = (string) $this->blade(<<<'BLADE'
         <x-form wire:submit="save" separator>
             <x-input label="Name" />
-            <x-slot:actions class="justify-between"><button>Save</button></x-slot:actions>
+            <x-slot:actions class="app-form-actions"><button>Save</button></x-slot:actions>
         </x-form>
         BLADE);
 
     expect($html)
         ->toContain('<form data-md-form wire:submit="save">')
         ->toContain('role="separator"')
-        ->toContain('<div data-md-form-actions class="justify-between">')
+        ->toContain('<div data-md-form-actions class="app-form-actions">')
         ->not->toContain('grid-cols-1')
         ->toContain('<button>Save</button>')
         ->and((string) $this->blade('<x-form><x-slot:actions><button>Save</button></x-slot:actions></x-form>'))