Fix sw.forms.render() preact globals

Use window.html + hooks destructuring to match existing SDK
primitive conventions (confirm.js, toast.js pattern).

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

src/js/sw/sdk/forms.js

@@ -10,7 +10,9 @@
 //   const result = await sw.forms.validateRemote(template, data);
 // ==========================================
 
-const { html, render, useState, useEffect, useRef } = preact;
+const { html } = window;
+const { h, render: preactRender } = preact;
+const { useState, useEffect, useRef } = hooks;
 
 // ── Field type → HTML input mapping ─────────
 
@@ -303,28 +305,14 @@ export function createForms(restClient) {
          */
         render(container, template, opts = {}) {
             const handle = { getData: () => ({}), setErrors: () => {}, destroy: () => {} };
-            const Wrapper = () => {
+
+            const ConnectedForm = () => {
                 const ref = useRef(handle);
-                return html`<${FormRenderer} template=${template} opts=${{ ...opts, ref }} />`;
-            };
-
-            // Render with handle ref wiring
-            render(html`<${() => {
-                const ref = useRef(handle);
-                useEffect(() => { ref.current = handle; }, []);
-                return html`<${FormRenderer} template=${template} opts=${{ ...opts }} />`;
-            }} />`, container);
-
-            // Wire getData into the handle via a simpler approach
-            const formEl = container.querySelector('.sw-form');
-            handle.destroy = () => { render(null, container); };
-
-            // Re-render with handle reference
-            const App = () => {
-                const internalRef = useRef(handle);
                 return html`<${FormRenderer} template=${template} opts=${{ ...opts }} />`;
             };
-            render(html`<${App} />`, container);
+
+            preactRender(html`<${ConnectedForm} />`, container);
+            handle.destroy = () => { preactRender(null, container); };
 
             return handle;
         },