Audit short-term: currency preview, date bounds, success destination, safe-area

- H3: Live currency preview below currency inputs shows the value formatted
  with thousands separators (en-US, USD) using Intl.NumberFormat. Skipped
  inside matrix cells to keep the Y1 monthly table compact.
- M1: Date inputs now apply min/max bounds. Default window is 1900-01-01 to
  2100-12-31; per-field override via FieldConfig.min/max as ISO strings.
- H6: On successful submit, replace the form with a SuccessDestination card
  (large checkmark, org name, "Submit another" + "safe to close" affordance).
  Prevents accidental duplicate submits from back-button / autofill replay.
- M6: Sticky submit bar respects iOS safe-area-inset-bottom.

FieldRenderer now takes a control prop so the currency preview can subscribe
to its single field via useWatch without re-rendering the whole form.

components/EngagementForm.tsx

@@ -182,6 +182,21 @@ export function EngagementForm({ config, cid, cs }: EngagementFormProps) {
   if (load.kind === "loading") return <LoadingState />;
   if (load.kind === "error") return <ErrorState message={load.message} />;
 
+  // After a successful submit, replace the form entirely with a destination
+  // screen. This prevents accidental duplicate submits (back-button, double-
+  // click, browser autofill replay) and gives the user a clear endpoint.
+  if (submitState.kind === "success") {
+    return (
+      <SuccessDestination
+        orgName={load.data.orgName}
+        onAnother={() => {
+          setSubmitState({ kind: "idle" });
+          window.scrollTo({ top: 0, behavior: "smooth" });
+        }}
+      />
+    );
+  }
+
   const onSubmit = async (values: Record<string, unknown>) => {
     setSubmitState({ kind: "submitting" });
     try {
@@ -283,6 +298,7 @@ export function EngagementForm({ config, cid, cs }: EngagementFormProps) {
               <StageSection
                 section={section}
                 register={register}
+                control={control}
                 errors={errors}
                 formValues={evalState}
                 isCurrent={section.rank === currentRank}
@@ -392,7 +408,10 @@ function SubmitBar({
   draftSavedAt: string | null;
 }) {
   return (
-    <div className="sticky bottom-3 z-20 flex flex-col gap-3 rounded-lg border border-rule bg-paper/95 px-5 py-4 shadow-[0_-4px_24px_-12px_rgba(60,80,40,0.2)] backdrop-blur sm:flex-row sm:items-center sm:justify-between sm:px-6">
+    <div
+      className="sticky bottom-3 z-20 flex flex-col gap-3 rounded-lg border border-rule bg-paper/95 px-5 py-4 shadow-[0_-4px_24px_-12px_rgba(60,80,40,0.2)] backdrop-blur sm:flex-row sm:items-center sm:justify-between sm:px-6"
+      style={{ marginBottom: "env(safe-area-inset-bottom)" }}
+    >
       <div className="flex flex-col gap-0.5">
         <SubmitFeedback state={state} />
         {state.kind === "idle" && (
@@ -429,12 +448,6 @@ function SubmitFeedback({ state }: { state: SubmitStatus }) {
         Saving your check-in…
       </p>
     );
-  if (state.kind === "success")
-    return (
-      <p className="text-sm font-medium text-leaf-800" role="status">
-        ✓ Check-in saved. Thank you.
-      </p>
-    );
   if (state.kind === "error")
     return (
       <p className="text-sm font-medium text-clay-700" role="alert">
@@ -471,6 +484,49 @@ function LoadingState() {
   );
 }
 
+function SuccessDestination({
+  orgName,
+  onAnother,
+}: {
+  orgName: string;
+  onAnother: () => void;
+}) {
+  return (
+    <section
+      role="status"
+      aria-live="polite"
+      className="rounded-lg border-2 border-leaf-600 bg-leaf-50/40 px-6 py-10 text-center shadow-[0_1px_0_0_rgba(0,0,0,0.04),0_12px_32px_-16px_rgba(60,80,40,0.22)] sm:px-10 sm:py-12"
+    >
+      <div
+        aria-hidden
+        className="mx-auto flex h-14 w-14 items-center justify-center rounded-full bg-leaf-700 text-paper shadow-sm"
+      >
+        <svg viewBox="0 0 24 24" className="h-7 w-7" fill="none" stroke="currentColor" strokeWidth="2.5" strokeLinecap="round" strokeLinejoin="round">
+          <path d="M5 12l5 5 9-11" />
+        </svg>
+      </div>
+      <h2 className="mt-5 font-display text-2xl font-medium leading-tight tracking-tight text-ink sm:text-3xl">
+        Check-in saved
+      </h2>
+      <p className="mx-auto mt-3 max-w-prose text-[15px] leading-relaxed text-ink-soft">
+        Thank you. We&apos;ve recorded this check-in for{" "}
+        <span className="font-medium text-ink">{orgName}</span>. Your engagement coordinator will see
+        it on their next review.
+      </p>
+      <div className="mt-7 flex flex-col items-center justify-center gap-3 sm:flex-row">
+        <button
+          type="button"
+          onClick={onAnother}
+          className="inline-flex items-center justify-center rounded-md border border-rule bg-paper px-5 py-2 text-sm font-medium text-ink-soft transition hover:bg-paper-2/60 focus:outline-none focus-visible:ring-2 focus-visible:ring-leaf-500/40"
+        >
+          Submit another check-in
+        </button>
+        <p className="text-xs text-ink-mute">It&apos;s safe to close this window.</p>
+      </div>
+    </section>
+  );
+}
+
 function ErrorState({ message }: { message: string }) {
   return (
     <div

components/StageSection.tsx

@@ -2,7 +2,12 @@
 
 import { useEffect, useId, useMemo, useState } from "react";
 import type { StageSectionConfig, SelectOption } from "@/types/form";
-import type { UseFormRegister, FieldValues, FieldErrors } from "react-hook-form";
+import type {
+  UseFormRegister,
+  FieldValues,
+  FieldErrors,
+  Control,
+} from "react-hook-form";
 import { FieldRenderer } from "./fields/FieldRenderer";
 import { MatrixGroup } from "./MatrixGroup";
 import { StageIcon } from "./StageIcon";
@@ -11,6 +16,7 @@ import { evaluate } from "@/lib/conditional";
 interface StageSectionProps {
   section: StageSectionConfig;
   register: UseFormRegister<FieldValues>;
+  control: Control<FieldValues>;
   errors: FieldErrors;
   /** Live form values, used to evaluate per-field visibility rules. */
   formValues: Record<string, unknown>;
@@ -36,6 +42,7 @@ interface StageSectionProps {
 export function StageSection({
   section,
   register,
+  control,
   errors,
   formValues,
   isCurrent,
@@ -153,6 +160,7 @@ export function StageSection({
                     <FieldRenderer
                       field={f}
                       register={register}
+                      control={control}
                       errors={errors}
                       readonlyValue={formValues[f.name]}
                       resolvedOptions={resolvedOptions}

components/fields/FieldRenderer.tsx

@@ -1,12 +1,20 @@
 "use client";
 
+import { useWatch } from "react-hook-form";
 import type { FieldConfig, SelectOption } from "@/types/form";
-import type { UseFormRegister, FieldValues, FieldErrors } from "react-hook-form";
+import type {
+  UseFormRegister,
+  FieldValues,
+  FieldErrors,
+  Control,
+} from "react-hook-form";
 
 interface FieldRendererProps {
   field: FieldConfig;
   register: UseFormRegister<FieldValues>;
   errors: FieldErrors;
+  /** Form control — required for currency live-preview formatting. */
+  control: Control<FieldValues>;
   /** For readonly display fields, the value to render. */
   readonlyValue?: unknown;
   /**
@@ -17,6 +25,9 @@ interface FieldRendererProps {
   resolvedOptions?: SelectOption[];
 }
 
+const DATE_MIN_DEFAULT = "1900-01-01";
+const DATE_MAX_DEFAULT = "2100-12-31";
+
 /**
  * Renders a single field appropriate to its `type`. All inputs share a common
  * accessibility scaffold: a real <label htmlFor>, aria-describedby pointing
@@ -34,6 +45,7 @@ export function FieldRenderer({
   field,
   register,
   errors,
+  control,
   readonlyValue,
   resolvedOptions,
 }: FieldRendererProps) {
@@ -263,17 +275,43 @@ export function FieldRenderer({
             </span>
           )}
         </div>
+        {field.type === "currency" && (
+          <CurrencyPreview control={control} name={field.name} />
+        )}
         {field.help && <Help id={helpId!}>{field.help}</Help>}
         {errorMsg && <ErrorText id={errorId!}>{errorMsg}</ErrorText>}
       </div>
     );
   }
 
-  // ── Default: text-like (text / email / phone / date) ────────────────────
+  // ── Date ────────────────────────────────────────────────────────────────
+  if (field.type === "date") {
+    const dateMin = typeof field.min === "string" ? field.min : DATE_MIN_DEFAULT;
+    const dateMax = typeof field.max === "string" ? field.max : DATE_MAX_DEFAULT;
+    return (
+      <div className="space-y-1">
+        <Label id={id} field={field} />
+        <input
+          id={id}
+          type="date"
+          aria-describedby={describedBy}
+          aria-invalid={errorMsg ? true : undefined}
+          aria-required={field.required || undefined}
+          min={dateMin}
+          max={dateMax}
+          {...register(field.name, { required: requiredOpt })}
+          className={baseInputClass}
+        />
+        {field.help && <Help id={helpId!}>{field.help}</Help>}
+        {errorMsg && <ErrorText id={errorId!}>{errorMsg}</ErrorText>}
+      </div>
+    );
+  }
+
+  // ── Default: text-like (text / email / phone) ───────────────────────────
   const inputType =
     field.type === "email" ? "email" :
     field.type === "phone" ? "tel" :
-    field.type === "date" ? "date" :
     "text";
 
   return (
@@ -301,6 +339,30 @@ export function FieldRenderer({
   );
 }
 
+const currencyFmt = new Intl.NumberFormat("en-US", {
+  style: "currency",
+  currency: "USD",
+  maximumFractionDigits: 2,
+});
+
+function CurrencyPreview({
+  control,
+  name,
+}: {
+  control: Control<FieldValues>;
+  name: string;
+}) {
+  const raw = useWatch({ control, name });
+  if (raw === undefined || raw === null || raw === "") return null;
+  const n = typeof raw === "number" ? raw : Number(raw);
+  if (!Number.isFinite(n)) return null;
+  return (
+    <p className="text-xs tabular-nums text-ink-mute" aria-live="polite">
+      {currencyFmt.format(n)}
+    </p>
+  );
+}
+
 function Label({ id, field }: { id: string; field: FieldConfig }) {
   return (
     <label htmlFor={id} className="block text-sm font-medium text-ink">