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/tsconfig.base.json

@@ -0,0 +1,9 @@
+{
+	"extends": "../../tsconfig.json",
+	"compilerOptions": {
+		"declaration": true,
+		"declarationMap": true,
+		"jsx": "react-jsx",
+		"lib": ["es2024", "DOM", "DOM.Iterable"]
+	}
+}