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/plugins/api-test/package.json

@@ -0,0 +1,37 @@
+{
+	"name": "@emdash-cms/plugin-api-test",
+	"private": true,
+	"version": "0.0.3",
+	"description": "Test plugin that exercises all EmDash plugin APIs",
+	"type": "module",
+	"main": "src/index.ts",
+	"exports": {
+		".": "./src/index.ts",
+		"./admin": "./src/admin.tsx"
+	},
+	"files": [
+		"src"
+	],
+	"keywords": [
+		"emdash",
+		"cms",
+		"plugin",
+		"test",
+		"api"
+	],
+	"author": "Matt Kane",
+	"license": "MIT",
+	"peerDependencies": {
+		"emdash": "workspace:>=0.9.0",
+		"react": "^18.0.0 || ^19.0.0",
+		"@phosphor-icons/react": "^2.1.10"
+	},
+	"dependencies": {},
+	"devDependencies": {},
+	"optionalDependencies": {},
+	"repository": {
+		"type": "git",
+		"url": "git+https://github.com/emdash-cms/emdash.git",
+		"directory": "packages/plugins/api-test"
+	}
+}