Shift labor category sort_order on conflict when saving

When a category is saved with a sort_order already occupied by another
record in the same company, all records at that position and above are
incremented by 1 before the save, inserting the new one cleanly at the
requested position.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

app/Models/Tenant/LaborCategory.php

@@ -3,6 +3,7 @@
 namespace App\Models\Tenant;
 
 use App\Models\Concerns\BelongsToTenant;
+use App\Models\Scopes\TenantScope;
 use Illuminate\Database\Eloquent\Model;
 
 class LaborCategory extends Model
@@ -11,6 +12,34 @@ class LaborCategory extends Model
 
     protected $fillable = ['company_id', 'name', 'name_ro', 'name_ru', 'name_en', 'sort_order'];
 
+    protected static function boot(): void
+    {
+        parent::boot();
+
+        // When sort_order is changed to a value already occupied by another record,
+        // shift all records at that position and above up by 1 to make room.
+        static::saving(function (self $cat) {
+            $new = (int) $cat->sort_order;
+            $old = (int) ($cat->getOriginal('sort_order') ?? PHP_INT_MAX);
+
+            if ($new === $old) return;
+
+            $conflict = static::withoutGlobalScope(TenantScope::class)
+                ->where('company_id', $cat->company_id)
+                ->where('sort_order', $new)
+                ->where('id', '!=', $cat->id ?? 0)
+                ->exists();
+
+            if ($conflict) {
+                static::withoutGlobalScope(TenantScope::class)
+                    ->where('company_id', $cat->company_id)
+                    ->where('sort_order', '>=', $new)
+                    ->where('id', '!=', $cat->id ?? 0)
+                    ->increment('sort_order');
+            }
+        });
+    }
+
     protected $casts = ['sort_order' => 'integer'];
 
     /** Localized display label — falls back through ru→en→name_ro→name. */