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/screenshots.json

@@ -0,0 +1,30 @@
+{
+	"blog": {
+		"pages": {
+			"homepage": "/",
+			"post": "/posts/building-for-the-long-term",
+			"posts": "/posts",
+			"about": "/pages/about",
+			"search": "/search?q=test",
+			"404": "/nonexistent"
+		}
+	},
+	"marketing": {
+		"pages": {
+			"homepage": "/",
+			"pricing": "/pricing",
+			"contact": "/contact",
+			"404": "/nonexistent"
+		}
+	},
+	"portfolio": {
+		"pages": {
+			"homepage": "/",
+			"work": "/work",
+			"work-tagged": "/work?tag=identity",
+			"project": "/work/meridian-brand",
+			"contact": "/contact",
+			"404": "/nonexistent"
+		}
+	}
+}