fix: ensure S3 download message hides when download finishes

- Add S3DownloadFinished event listener to Import component
- Add handleS3DownloadFinished method to set s3DownloadInProgress to false
- This ensures the 'Downloading from S3...' message is hidden when download completes
- The success message now properly displays after download finishes

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

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

app/Livewire/Project/Database/Import.php

@@ -76,9 +76,15 @@ public function getListeners()
 
         return [
             "echo-private:user.{$userId},DatabaseStatusChanged" => '$refresh',
+            'S3DownloadFinished' => 'handleS3DownloadFinished',
         ];
     }
 
+    public function handleS3DownloadFinished(): void
+    {
+        $this->s3DownloadInProgress = false;
+    }
+
     public function mount()
     {
         if (isDev()) {