WIP: Fix Android file writing permissions and path handling

- Refactor writeFile method to properly handle Android Storage Access Framework (SAF) URIs
- Update path construction for Android to use Download directory with correct permissions
- Enhance error handling and logging throughout file operations
- Add detailed logging for debugging file system operations
- Fix permission checking logic to handle "File does not exist" case correctly
- Improve error messages and stack traces in logs
- Add timestamp to all log entries for better debugging
- Use proper directory types (ExternalStorage for Android, Documents for iOS)
- Add UTF-8 encoding specification for file writes

This is a work in progress as we're still seeing permission issues with Android file writing.

package-lock.json

@@ -12313,9 +12313,9 @@
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+      "version": "9.2.1",
+      "resolved": "https://registry.npmjs.org/bignumber.js/-/bignumber.js-9.2.1.tgz",
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       "license": "MIT",
       "engines": {
         "node": "*"