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

app/Console/Kernel.php

@@ -19,6 +19,7 @@ use App\Console\Commands\RecalculateHeatCommand;
 use App\Jobs\RankComputeArtworkScoresJob;
 use App\Jobs\RankBuildListsJob;
 use App\Uploads\Commands\CleanupUploadsCommand;
+use App\Console\Commands\PublishScheduledArtworksCommand;
 
 class Kernel extends ConsoleKernel
 {
@@ -35,6 +36,7 @@ class Kernel extends ConsoleKernel
         \App\Console\Commands\AvatarsMigrate::class,
         \App\Console\Commands\ResetAllUserPasswords::class,
         CleanupUploadsCommand::class,
+        PublishScheduledArtworksCommand::class,
         BackfillArtworkEmbeddingsCommand::class,
         AggregateSimilarArtworkAnalyticsCommand::class,
         AggregateFeedAnalyticsCommand::class,
@@ -54,6 +56,13 @@ class Kernel extends ConsoleKernel
     protected function schedule(\Illuminate\Console\Scheduling\Schedule $schedule): void
     {
         $schedule->command('uploads:cleanup')->dailyAt('03:00');
+
+        // Publish artworks whose scheduled publish_at has passed
+        $schedule->command('artworks:publish-scheduled')
+            ->everyMinute()
+            ->name('publish-scheduled-artworks')
+            ->withoutOverlapping(2) // prevent overlap up to 2 minutes
+            ->runInBackground();
         $schedule->command('analytics:aggregate-similar-artworks')->dailyAt('03:10');
         $schedule->command('analytics:aggregate-feed')->dailyAt('03:20');
         // Recalculate trending scores every 30 minutes (staggered to reduce peak load)