Emdash source with visual editor image upload fix

Fixes:
1. media.ts: wrap placeholder generation in try-catch
2. toolbar.ts: check r.ok, display error message in popover

templates/marketing-cloudflare/src/components/MarketingBlocks.astro

@@ -0,0 +1,33 @@
+---
+/**
+ * Custom Portable Text renderer for marketing blocks.
+ *
+ * This component maps custom block types (marketing.hero, marketing.features, etc.)
+ * to their corresponding Astro components. Pass it to the PortableText component
+ * via the `components` prop.
+ */
+import type { PortableTextBlock } from "emdash";
+import { PortableText } from "emdash/ui";
+import Hero from "./blocks/Hero.astro";
+import Features from "./blocks/Features.astro";
+import Testimonials from "./blocks/Testimonials.astro";
+import Pricing from "./blocks/Pricing.astro";
+import FAQ from "./blocks/FAQ.astro";
+
+interface Props {
+	value: PortableTextBlock[];
+}
+
+const { value } = Astro.props;
+
+// Custom block type components
+const marketingTypes = {
+	"marketing.hero": Hero,
+	"marketing.features": Features,
+	"marketing.testimonials": Testimonials,
+	"marketing.pricing": Pricing,
+	"marketing.faq": FAQ,
+};
+---
+
+<PortableText value={value} components={{ type: marketingTypes }} />