refactor(bill-modal): extract PaymentFormFields (BM2, 4/n)

The add/edit manual-payment form (+ its PAYMENT_METHODS list) moves to its own
presentational component; the parent keeps the form state + submit handler.
Behavior-preserving — BillModal 1502 -> 1432 lines; build + client tests green.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

client/components/BillModal.jsx

@@ -22,6 +22,7 @@ import BillMerchantRules from '@/components/BillMerchantRules';
 import DebtDetailsSection from '@/components/bill-modal/DebtDetailsSection';
 import AutopayTrustIndicator from '@/components/bill-modal/AutopayTrustIndicator';
 import PaymentHistoryList from '@/components/bill-modal/PaymentHistoryList';
+import PaymentFormFields from '@/components/bill-modal/PaymentFormFields';
 import {
   BILLING_SCHEDULE_OPTIONS,
   billingCycleForSchedule,
@@ -41,15 +42,6 @@ function getOrdinalSuffix(day) {
 
 // Radix Select crashes on empty string value
 const CAT_NONE = 'none';
-const PAYMENT_METHODS = [
-  ['manual', 'Manual'],
-  ['bank', 'Bank Transfer'],
-  ['card', 'Card'],
-  ['autopay', 'Autopay'],
-  ['check', 'Check'],
-  ['cash', 'Cash'],
-];
-
 const DEBT_KEYWORDS = ['credit', 'loan', 'mortgage', 'housing', 'debt'];
 const SNOWBALL_KEYWORDS = ['credit', 'loan', 'debt', 'mortgage', 'housing'];
 const SUBSCRIPTION_TYPES = [
@@ -1091,79 +1083,17 @@ export default function BillModal({ bill, initialBill, categories, onClose, onSa
             </div>
 
             {paymentFormOpen && (
-              <form onSubmit={handlePaymentSubmit} className="mt-3 rounded-lg border border-border/60 bg-muted/20 p-3">
-                <div className="mb-3 flex items-center justify-between gap-3">
-                  <p className="text-xs font-semibold uppercase tracking-wider text-muted-foreground">
-                    {editingPayment ? 'Edit payment' : 'Add payment'}
-                  </p>
-                  <span className="rounded-md border border-emerald-500/25 bg-emerald-500/10 px-1.5 py-0.5 text-[10px] font-semibold uppercase tracking-wide text-emerald-600 dark:text-emerald-400">
-                    manual
-                  </span>
-                </div>
-                <div className="grid gap-3 sm:grid-cols-2">
-                  <div className="space-y-1.5">
-                    <Label className="text-xs uppercase tracking-wider text-muted-foreground">Amount ($)</Label>
-                    <Input
-                      type="number"
-                      min="0"
-                      step="0.01"
-                      value={paymentAmount}
-                      onChange={e => setPaymentAmount(e.target.value)}
-                      className={cn(inp, 'font-mono')}
-                      required
-                    />
-                  </div>
-                  <div className="space-y-1.5">
-                    <Label className="text-xs uppercase tracking-wider text-muted-foreground">Paid Date</Label>
-                    <Input
-                      type="date"
-                      value={paymentDate}
-                      onChange={e => setPaymentDate(e.target.value)}
-                      className={cn(inp, 'font-mono')}
-                      required
-                    />
-                  </div>
-                  <div className="space-y-1.5">
-                    <Label className="text-xs uppercase tracking-wider text-muted-foreground">Method</Label>
-                    <Select value={paymentMethod} onValueChange={setPaymentMethod}>
-                      <SelectTrigger className={cn(inp, 'w-full')}>
-                        <SelectValue />
-                      </SelectTrigger>
-                      <SelectContent>
-                        {PAYMENT_METHODS.map(([value, label]) => (
-                          <SelectItem key={value} value={value}>{label}</SelectItem>
-                        ))}
-                      </SelectContent>
-                    </Select>
-                  </div>
-                  <div className="space-y-1.5">
-                    <Label className="text-xs uppercase tracking-wider text-muted-foreground">Notes</Label>
-                    <Input
-                      value={paymentNotes}
-                      onChange={e => setPaymentNotes(e.target.value)}
-                      className={inp}
-                      placeholder="Paid from checking"
-                    />
-                  </div>
-                </div>
-                <div className="mt-3 flex justify-end gap-2">
-                  <Button
-                    type="button"
-                    variant="ghost"
-                    disabled={paymentBusy}
-                    onClick={() => {
-                      resetPaymentForm();
-                      setPaymentFormOpen(false);
-                    }}
-                    className="text-xs"
-                  >
-                    Cancel
-                  </Button>
-                  <Button type="submit" disabled={paymentBusy} className="text-xs">
-                    {paymentBusy ? 'Saving...' : editingPayment ? 'Save Payment' : 'Add Payment'}
-                  </Button>
-                </div>
-              </form>
+              <PaymentFormFields
+                inp={inp}
+                editingPayment={editingPayment}
+                paymentBusy={paymentBusy}
+                amount={paymentAmount} setAmount={setPaymentAmount}
+                date={paymentDate} setDate={setPaymentDate}
+                method={paymentMethod} setMethod={setPaymentMethod}
+                notes={paymentNotes} setNotes={setPaymentNotes}
+                onSubmit={handlePaymentSubmit}
+                onCancel={() => { resetPaymentForm(); setPaymentFormOpen(false); }}
+              />
             )}
           </div>
         )}

client/components/bill-modal/PaymentFormFields.jsx

@@ -0,0 +1,103 @@
+import { cn } from '@/lib/utils';
+import { Label } from '@/components/ui/label';
+import { Input } from '@/components/ui/input';
+import {
+  Select, SelectContent, SelectItem, SelectTrigger, SelectValue,
+} from '@/components/ui/select';
+import { Button } from '@/components/ui/button';
+
+const PAYMENT_METHODS = [
+  ['manual', 'Manual'],
+  ['bank', 'Bank Transfer'],
+  ['card', 'Card'],
+  ['autopay', 'Autopay'],
+  ['check', 'Check'],
+  ['cash', 'Cash'],
+];
+
+// Add/edit form for a manual payment on a bill (edit mode). Presentational —
+// the parent owns the form state, the submit handler, and open/close.
+export default function PaymentFormFields({
+  inp,
+  editingPayment,
+  paymentBusy,
+  amount, setAmount,
+  date, setDate,
+  method, setMethod,
+  notes, setNotes,
+  onSubmit,
+  onCancel,
+}) {
+  return (
+    <form onSubmit={onSubmit} className="mt-3 rounded-lg border border-border/60 bg-muted/20 p-3">
+      <div className="mb-3 flex items-center justify-between gap-3">
+        <p className="text-xs font-semibold uppercase tracking-wider text-muted-foreground">
+          {editingPayment ? 'Edit payment' : 'Add payment'}
+        </p>
+        <span className="rounded-md border border-emerald-500/25 bg-emerald-500/10 px-1.5 py-0.5 text-[10px] font-semibold uppercase tracking-wide text-emerald-600 dark:text-emerald-400">
+          manual
+        </span>
+      </div>
+      <div className="grid gap-3 sm:grid-cols-2">
+        <div className="space-y-1.5">
+          <Label className="text-xs uppercase tracking-wider text-muted-foreground">Amount ($)</Label>
+          <Input
+            type="number"
+            min="0"
+            step="0.01"
+            value={amount}
+            onChange={e => setAmount(e.target.value)}
+            className={cn(inp, 'font-mono')}
+            required
+          />
+        </div>
+        <div className="space-y-1.5">
+          <Label className="text-xs uppercase tracking-wider text-muted-foreground">Paid Date</Label>
+          <Input
+            type="date"
+            value={date}
+            onChange={e => setDate(e.target.value)}
+            className={cn(inp, 'font-mono')}
+            required
+          />
+        </div>
+        <div className="space-y-1.5">
+          <Label className="text-xs uppercase tracking-wider text-muted-foreground">Method</Label>
+          <Select value={method} onValueChange={setMethod}>
+            <SelectTrigger className={cn(inp, 'w-full')}>
+              <SelectValue />
+            </SelectTrigger>
+            <SelectContent>
+              {PAYMENT_METHODS.map(([value, label]) => (
+                <SelectItem key={value} value={value}>{label}</SelectItem>
+              ))}
+            </SelectContent>
+          </Select>
+        </div>
+        <div className="space-y-1.5">
+          <Label className="text-xs uppercase tracking-wider text-muted-foreground">Notes</Label>
+          <Input
+            value={notes}
+            onChange={e => setNotes(e.target.value)}
+            className={inp}
+            placeholder="Paid from checking"
+          />
+        </div>
+      </div>
+      <div className="mt-3 flex justify-end gap-2">
+        <Button
+          type="button"
+          variant="ghost"
+          disabled={paymentBusy}
+          onClick={onCancel}
+          className="text-xs"
+        >
+          Cancel
+        </Button>
+        <Button type="submit" disabled={paymentBusy} className="text-xs">
+          {paymentBusy ? 'Saving...' : editingPayment ? 'Save Payment' : 'Add Payment'}
+        </Button>
+      </div>
+    </form>
+  );
+}