fix(showcase): use supported ai:input block + bump objectui console pin (#1464)

- examples/app-showcase: the component-gallery page referenced
  `ai:chat_window`, which the Console intentionally does not register as
  an inline page component (the floating chatbot overlay is the canonical
  entry point), so it surfaced a loud "Unknown component type". Switch to
  the supported `ai:input` inline AI block.
- Bump .objectui-sha to pick up objectstack-ai/objectui#1431, which fills
  the Console field-widget and dashboard chart-type renderer registry gaps
  (toggle/multiselect/radio/checkboxes/tags/color/slider/rating/code/…
  fields and column/spline/pyramid/radar/kpi/bullet/… charts).

Co-authored-by: Jack Zhuang <277994282+os-zhuang@users.noreply.github.com>
Co-authored-by: Claude Opus 4.8 <noreply@anthropic.com>

Author: 3 people

.objectui-sha

@@ -1 +1 @@
-97468a164ab4efd64558e40ac0268fbe5a49e2bb
+0af951fc15e335fc9ccf840cd8dd6587b0d0aded

examples/app-showcase/src/pages/index.ts

@@ -45,7 +45,11 @@ export const ComponentGalleryPage: Page = {
       name: 'sidebar',
       width: 'small',
       components: [
-        { type: 'ai:chat_window', properties: { agentName: 'showcase_assistant' } },
+        // NOTE: `ai:chat_window` is intentionally NOT a supported inline page
+        // component — the canonical chat entry point is the floating chatbot
+        // overlay (plugin-chatbot), so referencing it here surfaces a loud
+        // "Unknown component type". Use a supported inline AI block instead.
+        { type: 'ai:input', properties: { agentName: 'showcase_assistant', placeholder: 'Ask the showcase assistant…' } },
       ],
     },
   ],