fix(builder): escape/allowlist all attribute-value sinks incl. numeric/enum props (XSS)

An adversarial pass found 5 Critical XSS sinks where props declared number/enum
in TypeScript were interpolated raw into exported HTML attribute values,
trusting the type — but nothing enforces it at runtime (AI update_props only
validates node_id; deserialized saved state is untyped JSON). Fixed all 5
(NumberCounter data-target, StarRating aria-label, FormContainer method,
ContactForm/InputField input type) plus 6 sibling sinks found by an exhaustive
audit of every attribute-value interpolation across src/components: a
JS-source injection into ContentSlider's inline setInterval script, a
prototype-pollution-adjacent allowlist gap in Section's divider-shape lookup,
TextareaField rows, Testimonials rating aria-label, HeroSimple textAlign, and
MapEmbed zoom. Adds shared sanitizeFormMethod/sanitizeInputType allowlist
helpers to utils/escape.ts alongside the existing escapeAttr/safeUrl/cssValue
primitives. Every fix is TDD'd: a malicious-value test reproduces the raw
injection against the pre-fix code, then passes after the fix.

502 tests green (npx vitest run), tsc + vite build green (npm run build).

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

craft/src/components/forms/TextareaField.tsx

@@ -97,6 +97,11 @@ TextareaField.craft = {
     ...props.style,
   });
   const reqAttr = props.required ? ' required' : '';
+  // `rows` is declared as a TS `number` but arrives unchecked (AI update_props
+  // path only validates node_id; deserialized saved-state JSON is untyped at
+  // runtime), so a string like `4"><script>...` must be coerced to a real
+  // number before interpolation, not trusted as already-numeric.
+  const rows = Number(props.rows) || 4;
   // Deterministic AND unique id: scoped on the Craft node id so the
   // <label for> always matches the <textarea id> AND two TextareaField
   // instances that share the same (often default) `name` -- e.g. two
@@ -113,7 +118,7 @@ TextareaField.craft = {
   return {
     html: `<div${wrapStyle ? ` style="${wrapStyle}"` : ''}>
   ${labelHtml}
-  <textarea id="${escapeAttr(fieldId)}" name="${escapeAttr(props.name || 'message')}" placeholder="${escapeAttr(props.placeholder || '')}" rows="${props.rows || 4}"${reqAttr}${ariaLabelAttr} style="padding:10px 12px;border:1px solid #d4d4d8;border-radius:6px;font-size:14px;color:#18181b;background-color:#ffffff;width:100%;box-sizing:border-box;resize:vertical;font-family:inherit"></textarea>
+  <textarea id="${escapeAttr(fieldId)}" name="${escapeAttr(props.name || 'message')}" placeholder="${escapeAttr(props.placeholder || '')}" rows="${escapeAttr(String(rows))}"${reqAttr}${ariaLabelAttr} style="padding:10px 12px;border:1px solid #d4d4d8;border-radius:6px;font-size:14px;color:#18181b;background-color:#ffffff;width:100%;box-sizing:border-box;resize:vertical;font-family:inherit"></textarea>
 </div>`,
   };
 };