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

i18n/tsconfig.json

@@ -0,0 +1,10 @@
+{
+	"compilerOptions": {
+		"module": "preserve",
+		"moduleResolution": "bundler",
+		"target": "es2024",
+		"strict": true,
+		"types": ["node"]
+	},
+	"include": ["build.ts"]
+}