Scan for Tailwind breakpoints, and drive the shell by class in the browser

Plan steps 15-17's testing. `tests/Feature/BreakpointsTest.php` reads every
file under resources/views, resources/css and resources/js — showcase example
heredocs included — and fails on any Tailwind breakpoint prefix and on any
media query or `matchMedia` string at 40, 48, 64 or 80rem (or 640/768/1024/
1280px, or the 39.99rem that stood for "below 640"). Both scans were checked
against a deliberately reintroduced `sm:w-auto` and an 80rem query.

Every render test that asserted a `sm:`/`lg:`/`xl:` class now asserts the M3
class, the drawer's pane query is 52.5rem, and the theme script keeps
`data-rail-auto` through `wire:navigate`.

NavigationTest drives the shell at 599/600/839/840/1199/1200/1600 with the
expectation each class carries: the bar on a compact window, the 96px rail from
the medium class's first pixel, a standard rail collapsed through expanded whose
menu button widens it in place with no scrim, and the rail expanded to begin
with from large and at extra-large. (Not run here — the Browser suite is out of
scope for this stream.)

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Qwx5USif3wFFmxtHg5U1g9

tests/Feature/Components/DataTest.php

@@ -33,7 +33,7 @@ it('draws Laravel\'s paginators in M3', function () {
         ->toContain('data-pagination')
         ->toContain('Page 3 of 10')
         ->toContain('21–30 of 95')
-        ->toContain('<span aria-current="page" class="grid size-10 place-items-center rounded-corner-full type-label-lg tabular-nums bg-secondary-container text-on-secondary-container max-sm:hidden">3</span>')
+        ->toContain('<span aria-current="page" class="grid size-10 place-items-center rounded-corner-full type-label-lg tabular-nums bg-secondary-container text-on-secondary-container max-medium:hidden">3</span>')
         ->toContain('href="/shares?page=2" rel="prev"')
         ->toContain('aria-label="Go to page 4"')
         ->not->toContain('text-gray');