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

docs/.vscode/extensions.json

@@ -0,0 +1,4 @@
+{
+	"recommendations": ["astro-build.astro-vscode"],
+	"unwantedRecommendations": []
+}

docs/.vscode/launch.json

@@ -0,0 +1,11 @@
+{
+	"version": "0.2.0",
+	"configurations": [
+		{
+			"command": "./node_modules/.bin/astro dev",
+			"name": "Development server",
+			"request": "launch",
+			"type": "node-terminal"
+		}
+	]
+}