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/DashboardTest.php

@@ -2,15 +2,17 @@
 
 use App\Models\User;
 
-test('guests are redirected to the login page', function () {
-    $response = $this->get(route('dashboard'));
-    $response->assertRedirect(route('login'));
+test('the starter placeholder dashboard is gone', function () {
+    $this->actingAs(User::factory()->admin()->create())
+        ->get('/dashboard')
+        ->assertNotFound();
 });
 
-test('authenticated users can visit the dashboard', function () {
-    $user = User::factory()->create();
-    $this->actingAs($user);
+test('a signed-in admin lands on the admin dashboard', function () {
+    $admin = User::factory()->admin()->create();
 
-    $response = $this->get(route('dashboard'));
-    $response->assertOk();
+    $this->post(route('login.store'), ['email' => $admin->email, 'password' => 'password'])
+        ->assertRedirect(route('admin.dashboard', absolute: false));
+
+    $this->get(route('admin.dashboard'))->assertOk();
 });