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

tests/Feature/Auth/AuthenticationTest.php

@@ -19,7 +19,7 @@ test('users can authenticate using the login screen', function () {
 
     $response
         ->assertSessionHasNoErrors()
-        ->assertRedirect(route('dashboard', absolute: false));
+        ->assertRedirect(route('admin.dashboard', absolute: false));
 
     $this->assertAuthenticated();
 });