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/Http/Controllers/Dashboard/FavoriteController.php

@@ -10,6 +10,7 @@ use Illuminate\Support\Facades\Log;
 use Illuminate\Support\Facades\DB;
 use Illuminate\Pagination\LengthAwarePaginator;
 use Illuminate\View\View;
+use App\Support\AvatarUrl;
 
 class FavoriteController extends Controller
 {
@@ -36,16 +37,41 @@ class FavoriteController extends Controller
 
         $artworks = collect();
         if ($slice !== []) {
-            $arts = Artwork::query()->whereIn('id', $slice)->with('user')->get()->keyBy('id');
+            $arts = Artwork::query()
+                ->whereIn('id', $slice)
+                ->with(['user.profile', 'categories'])
+                ->withCount(['favourites', 'comments'])
+                ->get()
+                ->keyBy('id');
+
             foreach ($slice as $id) {
                 $a = $arts->get($id);
                 if (! $a) continue;
+
+                $primaryCategory = $a->categories->sortBy('sort_order')->first();
+                $username = $a->user?->username ?? $a->user?->name ?? '';
+
                 $artworks->push((object) [
                     'id' => $a->id,
+                    'name' => $a->title,
                     'title' => $a->title,
                     'thumb' => $a->thumbUrl('md') ?? $a->thumbnail_url ?? null,
+                    'thumb_url' => $a->thumbUrl('md') ?? $a->thumbnail_url ?? null,
                     'slug' => $a->slug,
-                    'author' => $a->user?->username ?? $a->user?->name,
+                    'author' => $username,
+                    'uname' => $username,
+                    'username' => $a->user?->username ?? '',
+                    'avatar_url' => AvatarUrl::forUser(
+                        (int) ($a->user_id ?? 0),
+                        $a->user?->profile?->avatar_hash ?? null,
+                        64
+                    ),
+                    'category_name' => $primaryCategory->name ?? '',
+                    'category_slug' => $primaryCategory->slug ?? '',
+                    'width' => $a->width,
+                    'height' => $a->height,
+                    'likes' => (int) ($a->favourites_count ?? $a->likes ?? 0),
+                    'comments_count' => (int) ($a->comments_count ?? 0),
                     'published_at' => $a->published_at,
                 ]);
             }