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/perf-monitor/package.json

@@ -0,0 +1,24 @@
+{
+	"name": "@emdash-cms/perf-monitor",
+	"version": "0.0.1",
+	"private": true,
+	"type": "module",
+	"scripts": {
+		"dev": "vite dev",
+		"build": "vite build",
+		"deploy": "pnpm build && pnpm deploy:probes && wrangler deploy",
+		"deploy:probes": "for dir in dist/emdash_perf_probe_*; do wrangler deploy -c $dir/wrangler.json; done",
+		"cf-typegen": "wrangler types",
+		"typecheck": "tsc --noEmit",
+		"db:migrations:list": "wrangler d1 migrations list emdash_perf --remote",
+		"db:migrations:apply": "wrangler d1 migrations apply emdash_perf --remote",
+		"db:migrations:create": "wrangler d1 migrations create emdash_perf",
+		"trigger": "node scripts/trigger.mjs"
+	},
+	"devDependencies": {
+		"@cloudflare/vite-plugin": "^1.0.0",
+		"typescript": "catalog:",
+		"vite": "^6.0.0",
+		"wrangler": "catalog:"
+	}
+}