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/marketplace/package.json

@@ -0,0 +1,42 @@
+{
+  "name": "@emdash-cms/marketplace",
+  "version": "0.0.1",
+  "private": true,
+  "description": "Plugin marketplace Worker for EmDash CMS",
+  "type": "module",
+  "main": "src/index.ts",
+  "scripts": {
+    "dev": "wrangler dev",
+    "deploy": "wrangler deploy",
+    "test": "vitest",
+    "typecheck": "tsc --noEmit"
+  },
+  "dependencies": {
+    "hono": "^4.12.7",
+    "jose": "^6.1.3",
+    "modern-tar": "^0.7.5",
+    "zod": "^3.25.67"
+  },
+  "devDependencies": {
+    "@types/better-sqlite3": "^7.6.13",
+    "@types/node": "catalog:",
+    "better-sqlite3": "catalog:",
+    "typescript": "catalog:",
+    "vitest": "catalog:",
+    "wrangler": "catalog:"
+  },
+  "repository": {
+    "type": "git",
+    "url": "git+https://github.com/emdash-cms/emdash.git",
+    "directory": "packages/marketplace"
+  },
+  "homepage": "https://github.com/emdash-cms/emdash",
+  "keywords": [
+    "emdash",
+    "cms",
+    "marketplace",
+    "cloudflare-workers"
+  ],
+  "author": "Matt Kane",
+  "license": "MIT"
+}