feat: improve S3 restore path handling and validation state

- Add path attribute mutator to S3Storage model ensuring paths start with /
- Add updatedS3Path hook to normalize path and reset validation state on blur
- Add updatedS3StorageId hook to reset validation state when storage changes
- Add Enter key support to trigger file check from path input
- Use wire:model.live for S3 storage select, wire:model.blur for path input
- Improve shell escaping in restore job cleanup commands
- Fix isSafeTmpPath helper logic for directory validation

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

app/Models/S3Storage.php

@@ -3,6 +3,7 @@
 namespace App\Models;
 
 use App\Traits\HasSafeStringAttribute;
+use Illuminate\Database\Eloquent\Casts\Attribute;
 use Illuminate\Database\Eloquent\Factories\HasFactory;
 use Illuminate\Notifications\Messages\MailMessage;
 use Illuminate\Support\Facades\Storage;
@@ -41,6 +42,19 @@ class S3Storage extends BaseModel
         return "{$this->endpoint}/{$this->bucket}";
     }
 
+    protected function path(): Attribute
+    {
+        return Attribute::make(
+            set: function (?string $value) {
+                if ($value === null || $value === '') {
+                    return null;
+                }
+
+                return str($value)->trim()->start('/')->value();
+            }
+        );
+    }
+
     public function testConnection(bool $shouldSave = false)
     {
         try {