Square the full-screen dialog with the M3 corner token, and guard every package view

The one rounded-none left behind by the scale clearing becomes rounded-corner-none,
so the design guard's test of the package's own views needs no filter any more:
the breakpoint migration landed too.

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

resources/views/components/modal.blade.php

@@ -65,7 +65,7 @@
 >
     <div @class([
         'flex max-h-[inherit] flex-col overflow-y-auto rounded-corner-xl bg-surface-container-high p-6 shadow-elevation-3',
-        'max-medium:h-full max-medium:rounded-none max-medium:p-0 max-medium:pt-[var(--material-safe-top,env(safe-area-inset-top))]' => $fullscreen,
+        'max-medium:h-full max-medium:rounded-corner-none max-medium:p-0 max-medium:pt-[var(--material-safe-top,env(safe-area-inset-top))]' => $fullscreen,
         $boxClass,
     ])>
         @if ($fullscreen)