fix(data-table): preserve prior rows when multi-selecting

onRowSelectionChange computed the next selection from the render-time
`rowSelection` closure, which could be stale by the time a second row was
toggled. The updater then produced a selection containing only the latest
row, and the persistedMap sync deleted the earlier one — so checking a
second part unchecked the first, making multi-select behave as single-select.

Track the latest selection in a ref and derive the updater from it, so each
toggle builds on the current selection. Fixes adding multiple parts/services/
expense items in invoices, estimates, and job cards.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

apps/dashboard/shared/data-view/table-view/data-table.tsx

@@ -39,8 +39,13 @@ export function DataTable<TData>({
     // Persisted map of id → original row data across all pages
     const persistedMap = useRef<Map<string, TData>>(new Map())
 
-    // Current-page selection state that TanStack Table controls
+    // Current-page selection state that TanStack Table controls.
+    // A ref mirrors the latest value so onRowSelectionChange never derives the
+    // next selection from a stale closure (which would drop previously-checked
+    // rows and make multi-select behave like single-select).
     const [rowSelection, setRowSelection] = useState<RowSelectionState>({})
+    const rowSelectionRef = useRef<RowSelectionState>({})
+    rowSelectionRef.current = rowSelection
 
     // When the page/data changes, restore selection state for the new page from the map
     useEffect(() => {
@@ -50,6 +55,7 @@ export function DataTable<TData>({
             const id = String((row as Record<string, unknown>)[rowKeyStr])
             if (persistedMap.current.has(id)) restored[id] = true
         })
+        rowSelectionRef.current = restored
         setRowSelection(restored)
     }, [data]) // eslint-disable-line react-hooks/exhaustive-deps
 
@@ -128,7 +134,10 @@ export function DataTable<TData>({
             })
         },
         onRowSelectionChange: (updater) => {
-            const next = typeof updater === "function" ? updater(rowSelection) : updater
+            // Derive from the ref (always current), not the render-time closure,
+            // so toggling a second row preserves earlier selections.
+            const next = typeof updater === "function" ? updater(rowSelectionRef.current) : updater
+            rowSelectionRef.current = next
             setRowSelection(next)
             if (selection) {
                 // Sync current page into the persisted map