feat: forum rich-text editor, emoji picker, mentions, discover nav, feed, uploads, profile

Forum:
- TipTap WYSIWYG editor with full toolbar
- @emoji-mart/react emoji picker (consistent with tweets)
- @mention autocomplete with user search API
- Fix PHP 8.4 parse errors in Blade templates
- Fix thread data display (paginator items)
- Align forum page widths to max-w-5xl

Discover:
- Extract shared _nav.blade.php partial
- Add missing nav links to for-you page
- Add Following link for authenticated users

Feed/Posts:
- Post model, controllers, policies, migrations
- Feed page components (PostComposer, FeedCard, etc)
- Post reactions, comments, saves, reports, sharing
- Scheduled publishing support
- Link preview controller

Profile:
- Profile page components (ProfileHero, ProfileTabs)
- Profile API controller

Uploads:
- Upload wizard enhancements
- Scheduled publish picker
- Studio status bar and readiness checklist

vite.config.js

@@ -20,6 +20,9 @@ export default defineConfig({
                 'resources/js/Pages/Home/HomePage.jsx',
                 'resources/js/Pages/Community/LatestCommentsPage.jsx',
                 'resources/js/Pages/Messages/Index.jsx',
+                'resources/js/profile.jsx',
+                'resources/js/feed.jsx',
+                'resources/js/entry-forum.jsx',
             ],
             // Only watch Blade templates & routes for full-reload triggers
             // (instead of `true` which watches the entire project tree)