feat: initial release of relaticle/comments

Filament comments package with:
- Polymorphic commenting on any Eloquent model
- Threaded replies with configurable depth
- @mentions with autocomplete and user search
- Emoji reactions with toggle and who-reacted tooltips
- File attachments via Livewire uploads
- Reply and mention notifications via Filament notification system
- Thread subscriptions for notification control
- Real-time broadcasting (opt-in Echo) with polling fallback
- Dark mode support
- CommentsAction, CommentsTableAction, CommentsEntry for Filament integration
- 204 tests, 421 assertions

tests/Database/Factories/PostFactory.php

@@ -0,0 +1,19 @@
+<?php
+
+namespace Relaticle\Comments\Tests\Database\Factories;
+
+use Illuminate\Database\Eloquent\Factories\Factory;
+use Relaticle\Comments\Tests\Models\Post;
+
+class PostFactory extends Factory
+{
+    protected $model = Post::class;
+
+    /** @return array<string, mixed> */
+    public function definition(): array
+    {
+        return [
+            'title' => fake()->sentence(),
+        ];
+    }
+}