fix(builder): deterministic ids for NumberCounter + form-relay marker

Two components of the det-id bug class were missed in the earlier migration:
NumberCounter's wrapper/counter ids and count-up script, and the shared
form-relay-wiring fid (used by ContactForm/FormContainer). Both used
Math.random() for exported HTML ids, breaking caching/diffing across exports.

Migrate both to scopeId(nodeId, fallbackSeed, prefix), threading nodeId
through NumberCounter.toHtml and relayFormWiring (via ContactForm.toHtml and
FormContainer.toHtml, both now passing nodeId as their 3rd arg).

craft/src/components/sections/NumberCounter.toHtml.test.ts

@@ -0,0 +1,49 @@
+import { describe, test, expect } from 'vitest';
+import { NumberCounter } from './NumberCounter';
+
+const toHtml = (NumberCounter as any).toHtml;
+
+const counters = [
+  { number: 150, suffix: '+', label: 'Projects' },
+  { number: 50, suffix: '+', label: 'Clients' },
+];
+
+describe('NumberCounter.toHtml deterministic + unique scope ids (thread node id, no Math.random)', () => {
+  test('same node id -> identical output across calls (deterministic)', () => {
+    const { html: html1 } = toHtml({ counters }, '', 'node-nc1');
+    const { html: html2 } = toHtml({ counters }, '', 'node-nc1');
+    expect(html1).toBe(html2);
+  });
+
+  test('different node ids -> distinct, non-colliding nc_ scopes (identical props, no collision)', () => {
+    const { html: html1 } = toHtml({ counters }, '', 'node-nc1');
+    const { html: html2 } = toHtml({ counters }, '', 'node-nc2');
+    const wrapId1 = html1.match(/<div id="(nc_[^"]+)"/)![1];
+    const wrapId2 = html2.match(/<div id="(nc_[^"]+)"/)![1];
+    expect(wrapId1).not.toBe(wrapId2);
+  });
+
+  test('wrapper id, per-counter ids, and inline script agree on the same uid', () => {
+    const { html } = toHtml({ counters }, '', 'node-nc1');
+    const wrapId = html.match(/<div id="(nc_[^"]+)"/)![1];
+    expect(html).toContain(`id="${wrapId}_n0"`);
+    expect(html).toContain(`id="${wrapId}_n1"`);
+    expect(html).toContain(`var uid="${wrapId}"`);
+    expect(html).toContain('document.getElementById(uid)');
+    expect(html).toContain('document.getElementById(uid+"_n"+i)');
+  });
+
+  test('no nodeId (legacy 2-arg call): still deterministic across repeated calls, not random', () => {
+    const { html: html1 } = toHtml({ counters }, '');
+    const { html: html2 } = toHtml({ counters }, '');
+    expect(html1).toBe(html2);
+  });
+
+  test('two different node ids never collide even with default (no counters override) props', () => {
+    const { html: html1 } = toHtml({}, '', 'node-a');
+    const { html: html2 } = toHtml({}, '', 'node-b');
+    const wrapId1 = html1.match(/<div id="(nc_[^"]+)"/)![1];
+    const wrapId2 = html2.match(/<div id="(nc_[^"]+)"/)![1];
+    expect(wrapId1).not.toBe(wrapId2);
+  });
+});

craft/src/components/sections/NumberCounter.tsx

@@ -1,7 +1,7 @@
 import React, { CSSProperties } from 'react';
 import { useNode, UserComponent } from '@craftjs/core';
 import { cssPropsToString } from '../../utils/style-helpers';
-import { escapeHtml, escapeAttr } from '../../utils/escape';
+import { escapeHtml, escapeAttr, scopeId } from '../../utils/escape';
 
 interface Counter {
   number: number;
@@ -109,7 +109,7 @@ NumberCounter.craft = {
 
 /* ---------- HTML export ---------- */
 
-(NumberCounter as any).toHtml = (props: NumberCounterProps, _childrenHtml: string) => {
+(NumberCounter as any).toHtml = (props: NumberCounterProps, _childrenHtml: string, nodeId?: string) => {
   const {
     counters = defaultCounters,
     columns = 4,
@@ -120,7 +120,13 @@ NumberCounter.craft = {
   } = props;
 
   const items = counters.length > 0 ? counters : defaultCounters;
-  const uid = 'nc_' + Math.random().toString(36).slice(2, 8);
+
+  // Deterministic AND unique id for this counter instance's wrapper/span
+  // ids and getElementById() calls inside its inline script -- scoped on
+  // the Craft node id so two NumberCounter instances (e.g. both left at
+  // default props) don't collide and end up animating each other's digits.
+  const seed = items.map((c) => `${c.number}${c.suffix}::${c.label}`).join('|');
+  const uid = scopeId(nodeId, seed, 'nc');
 
   const sectionStyle = cssPropsToString({
     padding: '60px 20px',