Handle errors while changing the data folder

- Catch all errors and show them in error modal. Previously at least
  AccessDenied errors while writing the dataDirectoryOverrideFile in
  TSMM went unhandled
- Update settings only after the dataDirectoryOverrideFile has been
  successfully created, since it's less likely to fail than writing on
  the disk

src/pages/Manager.vue

@@ -518,9 +518,9 @@ import CategoryFilterModal from '../components/modals/CategoryFilterModal.vue';
  const isDefaultDataDirectory = files[0] === PathResolver.APPDATA_DIR;
 
  if (hasOverrideFile || !directoryHasContents || isDefaultDataDirectory) {
- await this.settings.setDataDirectory(files[0]);
  // Write dataDirectoryOverrideFile to allow re-selection of directory if changed at a later point.
  await fs.writeFile(path.join(files[0], dataDirectoryOverrideFile), "");
+ await this.settings.setDataDirectory(files[0]);
  InteractionProvider.instance.restartApp();
  } else {
  this.$store.commit('error/handleError', new R2Error(
@@ -530,6 +530,11 @@ import CategoryFilterModal from '../components/modals/CategoryFilterModal.vue';
  ));
  }
  }
+ }).catch((err) => {
+ this.$store.commit(
+ "error/handleError",
+ R2Error.fromThrownValue(err, "Failed to change Data Folder")
+ );
  });
  }