Respect existing file incrementation for uploaded files

Author: oscarcarlstrom

.changeset/new-lights-dig.md

@@ -0,0 +1,5 @@
+---
+"@obosbbl/grunnmuren-react": patch
+---
+
+Fix file count incrementation in FileUpload.

packages/react/src/file-upload/file-upload.tsx

@@ -85,7 +85,11 @@ function uniqueFileNames(files: File[]) {
     const extension = fileName.match(/(\.[^.]+)$/)?.[0] || '';
 
     if (!fileNameCounts[baseName]) {
-      fileNameCounts[baseName] = 0;
+      // Extract any number from the file name (if any, otherwise default to 0)
+      const baseNameCount = Number.parseInt(
+        fileName.match(/\((\d+)\)/)?.[1] ?? '0',
+      );
+      fileNameCounts[baseName] = baseNameCount;
     }
 
     fileNameCounts[baseName]++;