Resolve the package's own components through its namespace

Package views now write <x-livewire-material::button>, so a configured
prefix (which Blade spells <x-m::button>) and an application component
of the same name can no longer break or shadow them. The showcase
rewrites its examples to the configured prefix. Adds the README, and
waits for the adaptive rail to hear a resize before the navigation
tests press its menu button.

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

resources/views/components/navigation-rail.blade.php

@@ -107,8 +107,8 @@
                                 x-bind:aria-expanded="expanded.toString()"
                                 class="state-layer focus-ring inline-flex size-10 shrink-0 cursor-pointer items-center justify-center rounded-corner-full text-on-surface-variant after:absolute after:top-1/2 after:left-1/2 after:size-12 after:-translate-x-1/2 after:-translate-y-1/2"
                             >
-                                <span class="contents rail-collapsed:hidden"><x-icon name="menu_open" class="size-6" /></span>
-                                <span class="hidden rail-collapsed:contents"><x-icon name="menu" class="size-6" /></span>
+                                <span class="contents rail-collapsed:hidden"><x-livewire-material::icon name="menu_open" class="size-6" /></span>
+                                <span class="hidden rail-collapsed:contents"><x-livewire-material::icon name="menu" class="size-6" /></span>
                             </button>
                         @endif