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/core/tsconfig.json

@@ -0,0 +1,22 @@
+{
+	"extends": "../../tsconfig.json",
+	"compilerOptions": {
+		"outDir": "./dist",
+		"rootDir": "./src",
+		"declaration": true,
+		"declarationMap": true,
+		"noUncheckedIndexedAccess": false,
+		"types": ["astro/client"]
+	},
+	"include": ["src/**/*"],
+	"exclude": [
+		"node_modules",
+		"dist",
+		"tests",
+		"src/astro/**",
+		"src/components/**",
+		"src/preview/**",
+		"src/ui.ts",
+		"src/auth/providers/*-admin.tsx"
+	]
+}