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/menu-item.blade.php

@@ -85,7 +85,7 @@
 
 <{{ $tag }} {{ $attributes }}>
     @if ($icon)
-        <x-livewire-material::icon :name="$icon" :filled="$selected === true || $current" :class="$leadingIcon" />
+        <x-livewire-material::icon :name="$icon" optical="20" :filled="$selected === true || $current" :class="$leadingIcon" />
     @endif
 
     <span class="min-w-0 flex-1">
@@ -104,6 +104,6 @@
     @endif
 
     @if ($iconRight)
-        <x-livewire-material::icon :name="$iconRight" :class="'size-5 '.$iconInk" />
+        <x-livewire-material::icon :name="$iconRight" optical="20" :class="'size-5 '.$iconInk" />
     @endif
 </{{ $tag }}>