Align a side sheet's actions left, in M3's 72dp row

Plan step 19, containment.md C-10. The action row was right-aligned with
24px above it; the side-sheet specs table puts bottom actions on the
left in a 72dp row with 16dp above and 24dp below. A dialog's actions
stay trailing-aligned — M3 specifies the two differently.

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

tests/Feature/Components/OverlayTest.php

@@ -106,6 +106,11 @@ it('always offers a way out of a side sheet, as M3 requires', function () {
         ->and((string) $this->blade('<x-drawer pane pane-close-on-escape :with-close-button="false">Body</x-drawer>'))->not->toContain('aria-label="Close"');
 });
 
+it('puts a side sheet\'s actions on the left, in M3\'s 72dp row', function () {
+    expect((string) $this->blade('<x-drawer title="Details">Body<x-slot:actions><button>Delete</button></x-slot:actions></x-drawer>'))
+        ->toContain('flex min-h-18 shrink-0 flex-wrap items-center justify-start gap-2 pt-4');
+});
+
 it('slides a side sheet in from either edge, and is a pane from expanded when asked', function () {
     expect((string) $this->blade('<x-drawer title="Details" with-close-button>Body</x-drawer>'))
         ->toContain('x-trap.inert.noscroll="open && ! wide"')