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/Commands/WarmPostTrendingCommand.php

@@ -0,0 +1,28 @@
+<?php
+
+namespace App\Console\Commands;
+
+use App\Services\Posts\PostTrendingService;
+use Illuminate\Console\Command;
+
+/**
+ * Warms the post trending cache so requests are fast.
+ * Scheduled every 2 minutes to match the cache TTL.
+ */
+class WarmPostTrendingCommand extends Command
+{
+    protected $signature   = 'posts:warm-trending';
+    protected $description = 'Refresh the post trending feed cache.';
+
+    public function __construct(private PostTrendingService $trending)
+    {
+        parent::__construct();
+    }
+
+    public function handle(): int
+    {
+        $ids = $this->trending->refresh();
+        $this->info('Trending feed cache refreshed. ' . count($ids) . ' post(s) ranked.');
+        return self::SUCCESS;
+    }
+}