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/blocks/playground/tsconfig.json

@@ -0,0 +1,14 @@
+{
+	"compilerOptions": {
+		"target": "ES2024",
+		"module": "preserve",
+		"moduleResolution": "bundler",
+		"jsx": "react-jsx",
+		"strict": true,
+		"noUncheckedIndexedAccess": true,
+		"lib": ["ES2024", "DOM", "DOM.Iterable"],
+		"skipLibCheck": true,
+		"verbatimModuleSyntax": true
+	},
+	"include": ["src/**/*"]
+}