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

skills/wordpress-theme-to-emdash/scaffold/tsconfig.json

@@ -0,0 +1,8 @@
+{
+	"extends": "astro/tsconfigs/strict",
+	"compilerOptions": {
+		"strictNullChecks": true
+	},
+	"include": ["src/**/*", ".astro/**/*"],
+	"exclude": ["node_modules", "dist"]
+}