Add buttons, menus and the rest of M3 Expressive's actions

<x-button> (label buttons, icon buttons and toggles in five sizes, with
filled, tonal, outlined, elevated and text variants in any colour role),
<x-tooltip>, <x-menu> with items, groups and separators, <x-button-group>,
<x-group> as a connected button group, <x-split-button>, <x-fab>,
<x-fab-menu> and <x-loading>. Sizes, colours and shapes come from
androidx Compose Material 3's tokens; the loading indicator ports its
Morph into SVG + SMIL.

Menus follow WAI-ARIA's menu button pattern on popovers placed by CSS
anchor positioning. Browser tests run in Chromium, Firefox and WebKit.
The showcase fetches the icon names on demand: inlined, they tripped
Pest's test server into HTTP 431s under Firefox.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01V9NnLxnPp8vaaurb3Z1MFy

resources/views/components/fab-menu.blade.php

@@ -0,0 +1,77 @@
+{{-- An M3 Expressive FAB menu: a FAB that opens into a short list of related actions.
+
+         <div class="fixed end-4 bottom-4">
+             <x-fab-menu label="New">
+                 <x-fab-menu-item label="Upload files" icon="upload_file" wire:click="uploadFiles" />
+                 <x-fab-menu-item label="Upload a folder" icon="drive_folder_upload" wire:click="uploadFolder" />
+             </x-fab-menu>
+         </div>
+
+     Two to six items. The FAB (`icon`, `add` by default, in `color`'s container) turns into a
+     round close button in the colour itself while the list is open above it, end-aligned; the
+     list is a `popover="auto"` menu with the menu keyboard of `<x-menu>`. `label` names the FAB
+     for screen readers. Give the items the same `color`.
+
+     FabMenuBaselineTokens (androidx Compose Material 3, Apache-2.0): 56px items, 4px apart, 8px
+     above the close button. --}}
+
+@props([
+    'icon' => 'add',
+    'label' => null,
+    'color' => 'primary',
+    'position' => 'top-end',
+])
+
+@php
+    $color = in_array($color, ['primary', 'secondary', 'tertiary'], true) ? $color : 'primary';
+    $key = \Illuminate\Support\Str::lower(\Illuminate\Support\Str::random(10));
+    $anchor = "--material-fab-menu-{$key}";
+
+    $colours = [
+        'primary' => 'bg-primary-container text-on-primary-container aria-expanded:bg-primary aria-expanded:text-on-primary',
+        'secondary' => 'bg-secondary-container text-on-secondary-container aria-expanded:bg-secondary aria-expanded:text-on-secondary',
+        'tertiary' => 'bg-tertiary-container text-on-tertiary-container aria-expanded:bg-tertiary aria-expanded:text-on-tertiary',
+    ][$color];
+@endphp
+
+<div x-data="materialMenu" {{ $attributes->class('relative inline-flex') }}>
+    <span x-ref="trigger" class="inline-flex" style="anchor-name: {{ $anchor }}"
+        x-on:click="toggle('first')"
+        x-on:keydown.down.prevent="open('first')"
+        x-on:keydown.up.prevent="open('last')"
+    >
+        <button
+            type="button"
+            @if ($label) aria-label="{{ $label }}" @endif
+            @class([
+                'group/fab state-layer focus-ring inline-flex size-14 shrink-0 cursor-pointer items-center justify-center rounded-corner-lg shadow-elevation-3 hover:shadow-elevation-4',
+                'transition-[border-radius,background-color,color,box-shadow] duration-(--md-sys-motion-spatial-default-duration) ease-spatial-default aria-expanded:rounded-corner-full',
+                $colours,
+            ])
+        >
+            <x-icon :name="$icon" class="size-6 group-aria-expanded/fab:hidden" />
+            <x-icon name="close" class="hidden size-5 group-aria-expanded/fab:block" />
+        </button>
+    </span>
+
+    <div
+        x-ref="menu"
+        id="material-fab-menu-{{ $key }}"
+        popover="auto"
+        role="menu"
+        @if ($label) aria-label="{{ $label }}" @endif
+        tabindex="-1"
+        style="position-anchor: {{ $anchor }}"
+        x-on:keydown="navigate($event)"
+        x-on:click="activate($event)"
+        @class([
+            'm-0 flex-col gap-1 overflow-visible border-0 bg-transparent p-0 open:flex [inset:auto]',
+            'mb-2 items-end [position-area:top_span-left]' => $position === 'top-end',
+            'mb-2 items-start [position-area:top_span-right]' => $position === 'top-start',
+            'mt-2 items-end [position-area:bottom_span-left]' => $position === 'bottom-end',
+            'mt-2 items-start [position-area:bottom_span-right]' => $position === 'bottom-start',
+        ])
+    >
+        {{ $slot }}
+    </div>
+</div>