feat: add Equal Split toggle to new invoice form

Author: marvelousufelix

src/app/invoice/new/page.tsx

@@ -26,6 +26,13 @@ export default function NewInvoicePage() {
   );
   const [submitting, setSubmitting] = useState(false);
   const [error, setError] = useState<string | null>(null);
+  const [equalSplit, setEqualSplit] = useState(false);
+  const [totalAmount, setTotalAmount] = useState("");
+
+  const perRecipientAmount =
+    equalSplit && totalAmount && recipients.length > 0
+      ? (parseFloat(totalAmount) / recipients.length).toFixed(7)
+      : undefined;
 
   const handleSubmit = async (e: React.FormEvent) => {
     e.preventDefault();
@@ -39,7 +46,7 @@ export default function NewInvoicePage() {
         creator,
         recipients: recipients.map((r) => ({
           address: r.address,
-          amount: parseAmount(r.amount),
+          amount: parseAmount(equalSplit ? (perRecipientAmount ?? "0") : r.amount),
         })),
         token,
         deadline: deadlineFromDays(deadlineDays),
@@ -58,12 +65,61 @@ export default function NewInvoicePage() {
       <h1 className="text-3xl font-bold mb-8">Create Invoice</h1>
 
       <form onSubmit={handleSubmit} className="flex flex-col gap-6">
+        {/* Equal Split toggle */}
+        <div className="flex items-center justify-between rounded-lg bg-gray-800 border border-gray-700 px-4 py-3">
+          <span className="text-sm font-medium text-gray-300">Equal Split</span>
+          <button
+            type="button"
+            role="switch"
+            aria-checked={equalSplit}
+            onClick={() => setEqualSplit((v) => !v)}
+            className={`relative inline-flex h-6 w-11 items-center rounded-full transition-colors focus:outline-none focus:ring-2 focus:ring-indigo-500 ${
+              equalSplit ? "bg-indigo-600" : "bg-gray-600"
+            }`}
+          >
+            <span
+              className={`inline-block h-4 w-4 transform rounded-full bg-white transition-transform ${
+                equalSplit ? "translate-x-6" : "translate-x-1"
+              }`}
+            />
+          </button>
+        </div>
+
+        {/* Total amount input (equal split mode) */}
+        {equalSplit && (
+          <div>
+            <label className="block text-sm font-medium text-gray-300 mb-1">
+              Total Amount (USDC)
+            </label>
+            <input
+              type="number"
+              placeholder="0.00"
+              step="0.0000001"
+              min="0.0000001"
+              value={totalAmount}
+              onChange={(e) => setTotalAmount(e.target.value)}
+              required
+              className="w-full bg-gray-800 border border-gray-700 rounded-lg px-4 py-2 text-sm focus:outline-none focus:ring-2 focus:ring-indigo-500"
+            />
+            {perRecipientAmount && (
+              <p className="mt-1 text-xs text-gray-400">
+                {perRecipientAmount} USDC per recipient
+              </p>
+            )}
+          </div>
+        )}
+
         {/* Recipients */}
         <div>
           <label className="block text-sm font-medium text-gray-300 mb-2">
-            Recipients &amp; Amounts (USDC)
+            Recipients {equalSplit ? "" : "& Amounts (USDC)"}
           </label>
-          <RecipientForm recipients={recipients} onChange={setRecipients} />
+          <RecipientForm
+            recipients={recipients}
+            onChange={setRecipients}
+            equalSplit={equalSplit}
+            amountOverride={perRecipientAmount}
+          />
         </div>
 
         {/* Token address */}

src/components/RecipientForm.tsx

@@ -8,12 +8,19 @@ interface RecipientRow {
 interface Props {
   recipients: RecipientRow[];
   onChange: (rows: RecipientRow[]) => void;
+  equalSplit?: boolean;
+  amountOverride?: string;
 }
 
 /**
  * RecipientForm — dynamic add/remove rows for recipients and split amounts.
  */
-export default function RecipientForm({ recipients, onChange }: Props) {
+export default function RecipientForm({
+  recipients,
+  onChange,
+  equalSplit = false,
+  amountOverride,
+}: Props) {
   const update = (index: number, field: keyof RecipientRow, value: string) => {
     const next = recipients.map((r, i) =>
       i === index ? { ...r, [field]: value } : r
@@ -37,18 +44,25 @@ export default function RecipientForm({ recipients, onChange }: Props) {
             onChange={(e) => update(i, "address", e.target.value)}
             required
             aria-label={`Recipient ${i + 1} address`}
-            className="flex-1 bg-gray-800 border border-gray-700 rounded-lg px-3 py-2 text-sm focus:outline-none focus:ring-2 focus:ring-indigo-500 font-mono"
+            className="flex-1 bg-gray-800 border border-gray-700 rounded-lg px-3 py-2 text-sm focus:outline-none focus:ring-2 focus:ring-indigo-500 font-mono min-w-0"
           />
           <input
             type="number"
             placeholder="USDC"
             step="0.0000001"
             min="0.0000001"
-            value={row.amount}
-            onChange={(e) => update(i, "amount", e.target.value)}
+            value={equalSplit ? (amountOverride ?? "") : row.amount}
+            onChange={
+              equalSplit ? undefined : (e) => update(i, "amount", e.target.value)
+            }
+            readOnly={equalSplit}
             required
             aria-label={`Recipient ${i + 1} amount`}
-            className="w-28 bg-gray-800 border border-gray-700 rounded-lg px-3 py-2 text-sm focus:outline-none focus:ring-2 focus:ring-indigo-500"
+            className={`w-28 bg-gray-800 border rounded-lg px-3 py-2 text-sm focus:outline-none focus:ring-2 focus:ring-indigo-500 ${
+              equalSplit
+                ? "border-gray-600 text-gray-400 cursor-not-allowed"
+                : "border-gray-700"
+            }`}
           />
           {recipients.length > 1 && (
             <button