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/starter-cloudflare/astro.config.mjs

@@ -0,0 +1,22 @@
+import cloudflare from "@astrojs/cloudflare";
+import react from "@astrojs/react";
+import { d1, r2 } from "@emdash-cms/cloudflare";
+import { defineConfig } from "astro/config";
+import emdash from "emdash/astro";
+
+export default defineConfig({
+	output: "server",
+	adapter: cloudflare(),
+	image: {
+		layout: "constrained",
+		responsiveStyles: true,
+	},
+	integrations: [
+		react(),
+		emdash({
+			database: d1({ binding: "DB", session: "auto" }),
+			storage: r2({ binding: "MEDIA" }),
+		}),
+	],
+	devToolbar: { enabled: false },
+});