**refactor: improve FileSystemStorage compatibility and remove outdated test**

- Modified `storageFactory` to ensure `FileSystemStorage` gracefully degrades to `MemoryStorage` in browser environments, with proper warnings added.
- Enhanced `opfsStorage` adapter to support recursive directory removal with the `recursive` option.
- Removed `test-fix.js` script, as it is no longer relevant with recent storage fixes and updates.

**Purpose**: Streamline and ensure cross-environment compatibility for `FileSystemStorage`, while removing outdated test artifacts for better maintainability.

src/storage/adapters/opfsStorage.ts

@@ -632,7 +632,8 @@ export class OPFSStorage extends BaseStorage {
         ): Promise<void> => {
             try {
                 for await (const [name, handle] of dirHandle.entries()) {
-                    await dirHandle.removeEntry(name)
+                    // Use recursive option to handle directories that may contain files
+                    await dirHandle.removeEntry(name, { recursive: true })
                 }
             } catch (error) {
                 console.error(`Error removing directory contents:`, error)