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

demos/preview/CHANGELOG.md

@@ -0,0 +1,17 @@
+# @emdash-cms/demo-preview
+
+## 0.0.3
+
+### Patch Changes
+
+- Updated dependencies [[`3c319ed`](https://github.com/emdash-cms/emdash/commit/3c319ed6411a595e6974a86bc58c2a308b91c214)]:
+  - emdash@0.0.3
+  - @emdash-cms/cloudflare@0.0.3
+
+## 0.0.2
+
+### Patch Changes
+
+- Updated dependencies [[`b09bfd5`](https://github.com/emdash-cms/emdash/commit/b09bfd51cece5e88fe8314668a591ab11de36b4d)]:
+  - emdash@0.0.2
+  - @emdash-cms/cloudflare@0.0.2