Add Fortify auth, Flux dark mode, demo seed, and Docker hot reload.

Protect recordings per user, seed a demo login on container start, and bind-mount the app with Vite HMR for local Compose development.

tests/Feature/DemoUserSeederTest.php

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+<?php
+
+namespace Tests\Feature;
+
+use App\Models\Recording;
+use App\Models\User;
+use Database\Seeders\DatabaseSeeder;
+use Illuminate\Foundation\Testing\RefreshDatabase;
+use Illuminate\Support\Facades\Hash;
+use Tests\TestCase;
+
+class DemoUserSeederTest extends TestCase
+{
+    use RefreshDatabase;
+
+    public function test_seeder_creates_demo_user(): void
+    {
+        $this->seed(DatabaseSeeder::class);
+
+        $user = User::query()->where('email', 'demo@example.com')->first();
+
+        $this->assertNotNull($user);
+        $this->assertSame('Demo User', $user->name);
+        $this->assertTrue(Hash::check('password', $user->password));
+    }
+
+    public function test_seeder_is_idempotent(): void
+    {
+        $this->seed(DatabaseSeeder::class);
+        $this->seed(DatabaseSeeder::class);
+
+        $this->assertSame(1, User::query()->where('email', 'demo@example.com')->count());
+    }
+
+    public function test_seeder_assigns_orphaned_recordings_to_demo_user(): void
+    {
+        Recording::query()->create([
+            'title' => 'Orphan',
+            'original_filename' => 'orphan.mp3',
+            'file_path' => 'recordings/orphan.mp3',
+            'file_size_bytes' => 10,
+            'transcription_status' => 'pending',
+            'user_id' => null,
+        ]);
+
+        $this->seed(DatabaseSeeder::class);
+
+        $user = User::query()->where('email', 'demo@example.com')->first();
+
+        $this->assertNotNull($user);
+        $this->assertSame($user->id, Recording::query()->where('title', 'Orphan')->value('user_id'));
+    }
+}