Add payments with TDS, invoice detail view and filterable History (Phase E2)

- Migration M8 adds payments (cash, TDS, mode, reference). Payment status is derived, never stored: unpaid, partially paid, paid, or overdue. Overpayment is rejected, TDS counts toward settling, and only issued invoices accept payments. list_invoices and get_invoice carry the paid, TDS and balance summary.
- New invoice detail view: archived-PDF preview, payments list, Record payment modal, Export, Duplicate (as a draft), Re-render and Cancel. An invoice with payments cannot be cancelled until they are deleted.
- History gets search, status, financial-year, month and client filters, sortable columns, pagination, footer totals and an FY summary. Cancelled invoices are excluded from totals. The per-row archive-status calls are gone; archiving is on the detail page.
- Rust tests for payments and the list summary; vitest for fiscal-year, money, filter and duplicate helpers.

PDF output and fingerprint goldens are unchanged. The new UI has not been run in a webview yet.

src/views/NewInvoice.tsx

@@ -84,6 +84,9 @@ interface NewInvoiceProps {
   active: boolean;
   /** Ask the shell to show this view (used by Ctrl+N from another tab). */
   onActivate: () => void;
+  /** A draft to open as soon as the form is shown (set by "Duplicate" on the invoice page). */
+  openDraftId?: number | null;
+  onDraftOpened?: () => void;
 }
 
 const AUTOSAVE_MS = 1000;
@@ -94,7 +97,7 @@ const formatStamp = (iso: string) => {
   return Number.isNaN(d.getTime()) ? iso : `${d.toLocaleDateString("en-GB")} ${formatTime(d)}`;
 };
 
-export default function NewInvoice({ settings, onSettingsChange, active, onActivate }: NewInvoiceProps) {
+export default function NewInvoice({ settings, onSettingsChange, active, onActivate, openDraftId = null, onDraftOpened }: NewInvoiceProps) {
   const toast = useToast();
   const newItem = (): InvoiceItem => ({ ...EMPTY_ITEM, hsnSac: settings.defaultHsnSac });
   const blankState = (): InvoiceFormState => {
@@ -562,6 +565,14 @@ export default function NewInvoice({ settings, onSettingsChange, active, onActiv
     }
   };
 
+  useEffect(() => {
+    if (openDraftId === null || !active) return;
+    onDraftOpened?.();
+    void resumeDraft(openDraftId);
+    // resumeDraft closes over fresh state each render; only a new request should trigger it.
+    // eslint-disable-next-line react-hooks/exhaustive-deps
+  }, [openDraftId, active]);
+
   const removeDraft = async (id: number) => {
     try {
       await api.deleteDraft(id);