Replace the custom Alpine.js textarea + mention system with Filament v5's
built-in RichEditor component and MentionProvider. This fixes Alpine scope
errors (showMentions/mentionResults not defined) that occurred during
Livewire DOM morphing inside Filament slide-over modals.
- Add InteractsWithForms + HasForms to Comments and CommentItem components
- Define commentForm(), editForm(), replyForm() with RichEditor + mentions
- Add CommentsConfig::makeMentionProvider() shared helper
- Update MentionParser to extract mention IDs from RichEditor HTML format
- Update Comment::renderBodyWithMentions() to use RichContentRenderer
- Remove all custom Alpine.js mention code from blade templates
- Backward compatible with existing plain text 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
