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

templates/marketing/tsconfig.json

@@ -0,0 +1,5 @@
+{
+	"extends": "astro/tsconfigs/strict",
+	"include": [".astro/types.d.ts", "**/*"],
+	"exclude": ["dist"]
+}