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/Feature/UserMentionedEventTest.php

@@ -0,0 +1,25 @@
+<?php
+
+use Relaticle\Comments\Comment;
+use Relaticle\Comments\Events\UserMentioned;
+use Relaticle\Comments\Tests\Models\Post;
+use Relaticle\Comments\Tests\Models\User;
+
+it('carries correct comment and mentioned user in payload', function () {
+    $user = User::factory()->create();
+    $mentionedUser = User::factory()->create(['name' => 'john']);
+    $post = Post::factory()->create();
+
+    $comment = Comment::factory()->create([
+        'commentable_id' => $post->id,
+        'commentable_type' => $post->getMorphClass(),
+        'user_id' => $user->getKey(),
+        'user_type' => $user->getMorphClass(),
+        'body' => '<p>@john</p>',
+    ]);
+
+    $event = new UserMentioned($comment, $mentionedUser);
+
+    expect($event->comment)->toBe($comment)
+        ->and($event->mentionedUser)->toBe($mentionedUser);
+});