Give the xs button M3's 16dp padding, and stop groups wrapping

ButtonXSmallTokens puts 16dp either side of an xs label, where the button, the
<x-group> segment and --group-pad all wrote 12px; the variants table calls 16dp
the Expressive value twice over. A standard button group also dropped onto a
second line on a narrow window, which M3 forbids — and the press expansion only
ever reaches a neighbour on the same line. Plan step 18, actions.md ACT-09,
ACT-10.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Qwx5USif3wFFmxtHg5U1g9

resources/views/components/button.blade.php

@@ -150,7 +150,7 @@
             'xl' => ['narrow' => 'h-34 w-26', 'default' => 'size-34', 'wide' => 'h-34 w-46'],
         ][$size][$width]
         : [
-            'xs' => 'h-8 gap-2 px-3 type-label-lg',
+            'xs' => 'h-8 gap-2 px-4 type-label-lg',
             'sm' => 'h-10 gap-2 px-4 type-label-lg',
             'md' => 'h-14 gap-2 px-6 type-title-md',
             'lg' => 'h-24 gap-3 px-12 type-headline-sm',