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

packages/cloudflare/tsdown.config.ts

@@ -0,0 +1,25 @@
+import { defineConfig } from "tsdown";
+
+export default defineConfig({
+	entry: [
+		"src/index.ts",
+		"src/db/d1.ts",
+		"src/db/do.ts",
+		"src/db/playground.ts",
+		"src/db/playground-middleware.ts",
+		"src/storage/r2.ts",
+		"src/auth/index.ts",
+		"src/sandbox/index.ts",
+		"src/plugins/index.ts",
+		// Media provider runtimes
+		"src/media/images-runtime.ts",
+		"src/media/stream-runtime.ts",
+		// Cache provider
+		"src/cache/runtime.ts",
+		"src/cache/config.ts",
+	],
+	format: ["esm"],
+	dts: true,
+	clean: true,
+	external: ["cloudflare:workers", "cloudflare:email"],
+});