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

infra/cache-demo/package.json

@@ -0,0 +1,37 @@
+{
+	"name": "@emdash-cms/cache-demo-site",
+	"version": "0.0.4",
+	"private": true,
+	"type": "module",
+	"scripts": {
+		"dev": "astro dev",
+		"build": "astro build",
+		"preview": "astro preview",
+		"deploy": "astro build && wrangler deploy",
+		"typecheck": "astro check",
+		"bootstrap": "emdash init && emdash seed",
+		"seed": "emdash seed"
+	},
+	"dependencies": {
+		"@astrojs/cloudflare": "https://pkg.pr.new/@astrojs/cloudflare@94d342d",
+		"@astrojs/react": "catalog:",
+		"@emdash-cms/cloudflare": "workspace:*",
+		"@emdash-cms/plugin-forms": "workspace:*",
+		"@emdash-cms/plugin-webhook-notifier": "workspace:*",
+		"astro": "https://pkg.pr.new/astro@94d342d",
+		"emdash": "workspace:*",
+		"react": "catalog:",
+		"react-dom": "catalog:"
+	},
+	"devDependencies": {
+		"@astrojs/check": "catalog:",
+		"@cloudflare/workers-types": "catalog:",
+		"wrangler": "^4.83.0"
+	},
+	"pnpm": {
+		"onlyBuiltDependencies": [
+			"esbuild",
+			"workerd"
+		]
+	}
+}