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/Livewire/Project/Database/Import.php

@@ -280,6 +280,23 @@ EOD;
         }
     }
 
+    public function updatedS3Path($value)
+    {
+        // Reset validation state when path changes
+        $this->s3FileSize = null;
+
+        // Ensure path starts with a slash
+        if ($value !== null && $value !== '') {
+            $this->s3Path = str($value)->trim()->start('/')->value();
+        }
+    }
+
+    public function updatedS3StorageId()
+    {
+        // Reset validation state when storage changes
+        $this->s3FileSize = null;
+    }
+
     public function checkS3File()
     {
         if (! $this->s3StorageId) {