feat: use xpier media library for uploads and markdown embeds

Store media:ID in post bodies instead of CDN URLs, and keep sablog attach tokens as a fallback.

Co-authored-by: Cursor <cursoragent@cursor.com>

app/Models/Category.php

@@ -6,8 +6,10 @@ namespace App\Models;
 
 use Illuminate\Database\Eloquent\Factories\HasFactory;
 use Illuminate\Database\Eloquent\Model;
+use Illuminate\Database\Eloquent\Relations\BelongsTo;
 use Illuminate\Database\Eloquent\Relations\HasMany;
 use Spatie\MediaLibrary\HasMedia;
+use Xpier\FilamentMediaLibrary\Models\MediaLibrary;
 use Spatie\MediaLibrary\InteractsWithMedia;
 
 class Category extends Model implements HasMedia
@@ -21,6 +23,7 @@ class Category extends Model implements HasMedia
         'display_order',
         'post_count',
         'description',
+        'cover_media_id',
     ];
 
     public function posts(): HasMany
@@ -28,6 +31,21 @@ class Category extends Model implements HasMedia
         return $this->hasMany(Post::class);
     }
 
+    public function coverMedia(): BelongsTo
+    {
+        return $this->belongsTo(MediaLibrary::class, 'cover_media_id');
+    }
+
+    public function coverImageUrl(): ?string
+    {
+        $libraryUrl = $this->coverMedia?->url;
+        if (filled($libraryUrl)) {
+            return (string) $libraryUrl;
+        }
+
+        return $this->getFirstMedia('cover')?->getUrl();
+    }
+
     public function getUrlAttribute(): string
     {
         return route('category.show', $this->slug ?? $this->id);