Fill the FAB and icon-button glyphs, and cut small ones at 20

M3 asks a FAB's icon and a default (non-toggle) icon button's icon to be filled,
never outlined; the toggle half of that rule was already right, so only the
`$selected === null` case changed. Every glyph these components draw at 20px now
passes `optical="20"` for the cut M3 draws at that size — button xs/sm, group,
menu item, the alert, snackbar and FAB-menu close buttons, the stat's icon.
Plan step 18, actions.md ACT-14, ACT-15.

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

resources/views/components/toast.blade.php

@@ -85,7 +85,7 @@
 
                 <template x-if="current.action || ! current.timeout">
                     <button type="button" class="state-layer focus-ring inline-flex size-10 shrink-0 items-center justify-center rounded-corner-full" aria-label="{{ __('Dismiss') }}" x-on:click="dismiss()">
-                        <x-livewire-material::icon name="close" class="size-5" />
+                        <x-livewire-material::icon name="close" optical="20" class="size-5" />
                     </button>
                 </template>
             </div>