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/astro.config.mjs

@@ -0,0 +1,77 @@
+import cloudflare from "@astrojs/cloudflare";
+import react from "@astrojs/react";
+import { d1, r2 } from "@emdash-cms/cloudflare";
+import icon from "astro-iconset";
+import { defineConfig, fontProviders } from "astro/config";
+import emdash from "emdash/astro";
+
+export default defineConfig({
+	output: "server",
+	adapter: cloudflare(),
+	image: {
+		layout: "constrained",
+		responsiveStyles: true,
+	},
+	vite: {
+		ssr: {
+			optimizeDeps: {
+				// Pre-bundle so it isn't discovered mid-render, which would trigger
+				// a Vite dep re-optimization and break in-flight worker imports
+				// under the Cloudflare dev runner (workerd).
+				include: ["astro-iconset/components"],
+			},
+		},
+	},
+	integrations: [
+		react(),
+		icon({
+			// Only ship the Phosphor icons actually referenced in templates,
+			// not the full @iconify-json/ph set (which adds megabytes to the
+			// deployed worker bundle).
+			include: {
+				ph: [
+					"chart-bar",
+					"check-circle",
+					"clock",
+					"cloud",
+					"code",
+					"currency-dollar",
+					"envelope",
+					"globe",
+					"heart",
+					"lifebuoy",
+					"lightning",
+					"lock",
+					"shield-check",
+					"sparkle",
+					"star",
+					"users-three",
+				],
+			},
+		}),
+		emdash({
+			database: d1({ binding: "DB", session: "auto" }),
+			storage: r2({ binding: "MEDIA" }),
+			plugins: [
+				{
+					id: "marketing-blocks",
+					version: "0.1.0",
+					// Absolute file:// URL so the virtual emdash/plugins module
+					// can resolve this at build time (relative paths fail because
+					// the virtual module has no on-disk location to anchor them).
+					entrypoint: new URL("./src/plugins/marketing-blocks/index.ts", import.meta.url).href,
+				},
+			],
+		}),
+	],
+	fonts: [
+		{
+			provider: fontProviders.google(),
+			name: "Inter",
+			cssVariable: "--font-sans",
+			weights: [400, 500, 600, 700, 800],
+			fallbacks: ["sans-serif"],
+		},
+	],
+	devToolbar: { enabled: false },
+});