Move SealShare onto Livewire Material

Replaces maryUI and daisyUI with nonameweb/livewire-material: the Vibrant
indigo scheme, a system/light/dark theme under sealshare-theme, one top
app bar with the account menu, the upload drop zone and link-ready
moments, M3 fields, dialogs instead of wire:confirm, snackbars instead of
flashed messages, a sortable admin table, and the starter-kit cleanup.
Docker builds assets after Composer; CI drops the Flux step.

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

resources/views/components/auth-header.blade.php

@@ -4,6 +4,6 @@
 ])
 
 <div class="flex w-full flex-col text-center">
-    <h2 class="text-xl font-bold">{{ $title }}</h2>
-    <p class="text-sm opacity-60 mt-1">{{ $description }}</p>
+    <h1 class="type-headline-sm">{{ $title }}</h1>
+    <p class="mt-1 type-body-md text-on-surface-variant">{{ $description }}</p>
 </div>