feat: make MH Paid column inline-editable

Add PATCH /api/payments/:id/mh-paid-amount for direct value updates.
Clicking the MH Paid cell opens an input; Enter/blur saves and refreshes,
Escape cancels. Dash placeholder is also clickable to enter a value.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

apps/Backend/src/routes/payments.ts

@@ -427,6 +427,34 @@ router.patch(
   }
 );
 
+// PATCH /api/payments/:id/mh-paid-amount
+router.patch(
+  "/:id/mh-paid-amount",
+  async (req: Request, res: Response): Promise<any> => {
+    try {
+      const userId = req.user?.id;
+      if (!userId) return res.status(401).json({ message: "Unauthorized" });
+
+      const paymentId = parseIntOrError(req.params.id, "Payment ID");
+      const raw = req.body.mhPaidAmount;
+      const mhPaidAmount = parseFloat(raw);
+      if (isNaN(mhPaidAmount) || mhPaidAmount < 0) {
+        return res.status(400).json({ message: "Invalid mhPaidAmount value" });
+      }
+
+      const updated = await prisma.payment.update({
+        where: { id: paymentId },
+        data: { mhPaidAmount, updatedById: userId },
+      });
+
+      return res.json({ ...updated, mhPaidAmount: Number(updated.mhPaidAmount) });
+    } catch (err: unknown) {
+      const message = err instanceof Error ? err.message : "Failed to update MH paid amount";
+      return res.status(500).json({ message });
+    }
+  }
+);
+
 // PATCH /api/payments/:id/mh-payment-check
 router.patch(
   "/:id/mh-payment-check",

apps/Frontend/src/components/payments/payments-recent-table.tsx

@@ -99,6 +99,8 @@ export default function PaymentsRecentTable({
   const [selectedPaymentId, setSelectedPaymentId] = useState<number | null>(null);
   const [checkedPaymentIds, setCheckedPaymentIds] = useState<Set<number>>(new Set());
   const [isMhChecking, setIsMhChecking] = useState(false);
+  const [editingMhPaidId, setEditingMhPaidId] = useState<number | null>(null);
+  const [editingMhPaidValue, setEditingMhPaidValue] = useState<string>("");
 
   const [isRevertOpen, setIsRevertOpen] = useState(false);
   const [revertPaymentId, setRevertPaymentId] = useState<number | null>(null);
@@ -741,12 +743,60 @@ export default function PaymentsRecentTable({
                     </TableCell>
 
                     <TableCell>
-                      {payment.mhPaidAmount != null ? (
-                        <span className="text-sm font-medium text-green-700">
-                          ${Number(payment.mhPaidAmount).toFixed(2)}
-                        </span>
+                      {editingMhPaidId === payment.id ? (
+                        <input
+                          type="number"
+                          min="0"
+                          step="0.01"
+                          autoFocus
+                          className="w-24 border border-blue-400 rounded px-1 py-0.5 text-sm focus:outline-none focus:ring-2 focus:ring-blue-300"
+                          value={editingMhPaidValue}
+                          onChange={(e) => setEditingMhPaidValue(e.target.value)}
+                          onKeyDown={async (e) => {
+                            if (e.key === "Enter") {
+                              e.currentTarget.blur();
+                            } else if (e.key === "Escape") {
+                              setEditingMhPaidId(null);
+                            }
+                          }}
+                          onBlur={async () => {
+                            const val = parseFloat(editingMhPaidValue);
+                            if (!isNaN(val) && val >= 0) {
+                              try {
+                                const res = await apiRequest(
+                                  "PATCH",
+                                  `/api/payments/${payment.id}/mh-paid-amount`,
+                                  { mhPaidAmount: val }
+                                );
+                                if (res.ok) {
+                                  await queryClient.invalidateQueries({ queryKey: QK_PAYMENTS_RECENT_BASE });
+                                } else {
+                                  toast({ title: "Error", description: "Failed to save MH paid amount.", variant: "destructive" });
+                                }
+                              } catch {
+                                toast({ title: "Error", description: "Failed to save MH paid amount.", variant: "destructive" });
+                              }
+                            }
+                            setEditingMhPaidId(null);
+                          }}
+                        />
                       ) : (
-                        <span className="text-xs text-gray-400">—</span>
+                        <span
+                          className="text-sm font-medium text-green-700 cursor-pointer hover:underline hover:text-green-900"
+                          title="Click to edit"
+                          onClick={() => {
+                            setEditingMhPaidId(payment.id);
+                            setEditingMhPaidValue(
+                              payment.mhPaidAmount != null
+                                ? Number(payment.mhPaidAmount).toFixed(2)
+                                : "0.00"
+                            );
+                          }}
+                        >
+                          {payment.mhPaidAmount != null
+                            ? `$${Number(payment.mhPaidAmount).toFixed(2)}`
+                            : <span className="text-gray-400 font-normal">—</span>}
+                        </span>
                       )}
                     </TableCell>