feat(data-grid): add whitespace visualization toggle

apps/desktop/src/lib/settings/settingsTransfer.ts

@@ -149,6 +149,7 @@ const SETTINGS_TRANSFER_CATEGORY_KEYS: Record<SettingsTransferCategoryId, readon
     "dataGridCellDetailButtonVisible",
     "dataGridCrosshairHighlight",
     "flatteningMultiLineText",
+    "dataGridShowWhitespace",
     "pageSize",
     "tableOpenPageSize",
     "queryResultMaxRowsEnabled",
@@ -259,6 +260,7 @@ const PASS_THROUGH_BOOLEAN_KEYS = [
   "compactColumnHeaderActions",
   "dataGridQuickEntry",
   "flatteningMultiLineText",
+  "dataGridShowWhitespace",
   "infiniteScroll",
   "autoCalculateTotalRows",
   "autoSelectActiveSidebarNode",