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/README.md

@@ -0,0 +1,101 @@
+# EmDash Theme Scaffold
+
+This is a minimal, working EmDash theme that demonstrates correct patterns for:
+
+- **Site settings** - Use `getSiteSettings()` for title, tagline, logo - never hard-code
+- **Menus** - Use `getMenu()` for navigation - never hard-code links
+- **Image fields** - Always access `.src` and `.alt`, never the field directly
+- **Taxonomy terms** - Use `getEntryTerms()` without a db parameter
+- **PortableText** - Use the `<PortableText>` component from `emdash/ui`
+
+## Critical: No Hard-Coded Content
+
+The theme is a shell that displays CMS content. Never hard-code:
+
+- Site title or tagline (use `settings.title`, `settings.tagline`)
+- Navigation links (use `getMenu("primary")`)
+- Logo or favicon (use `settings.logo`, `settings.favicon`)
+- Footer content (use site settings or widget areas)
+
+## Usage
+
+When porting a WordPress theme:
+
+1. Copy this scaffold to your theme directory
+2. Run `pnpm install` from monorepo root
+3. Verify it builds: `pnpm --filter your-theme build`
+4. Use these templates as reference for correct API usage
+
+## Key Patterns
+
+### Image Fields
+
+```astro
+{/* CORRECT - check .src exists */}
+{post.data.featured_image?.src && (
+  <img
+    src={post.data.featured_image.src}
+    alt={post.data.featured_image.alt || post.data.title}
+  />
+)}
+
+{/* WRONG - field is an object, not a string */}
+{post.data.featured_image && (
+  <img src={post.data.featured_image} />  // Renders [object Object]
+)}
+```
+
+### Taxonomy Terms
+
+```astro
+{/* CORRECT - no db parameter */}
+const categories = await getEntryTerms("posts", post.id, "categories");
+
+{/* WRONG - db is not a parameter */}
+const categories = await getEntryTerms("posts", post.id, "categories", db);
+```
+
+### Seed File Images
+
+```json
+{
+	"featured_image": {
+		"$media": {
+			"url": "https://example.com/image.jpg",
+			"alt": "Description",
+			"filename": "image.jpg"
+		}
+	}
+}
+```
+
+At runtime, this becomes `{ src: "...", alt: "..." }`.
+
+## Files
+
+```
+scaffold/
+├── package.json           # Working dependency versions
+├── astro.config.mjs       # Minimal config
+├── tsconfig.json
+├── src/
+│   ├── env.d.ts
+│   ├── live.config.ts     # Collection loader setup
+│   ├── styles/global.css  # Minimal styles with comments
+│   ├── layouts/Base.astro # Header, footer, menus
+│   ├── components/
+│   │   └── PostCard.astro # Image field handling example
+│   └── pages/
+│       ├── index.astro
+│       ├── 404.astro
+│       ├── posts/
+│       │   ├── index.astro
+│       │   └── [slug].astro  # Taxonomy terms example
+│       ├── pages/[slug].astro
+│       ├── categories/[slug].astro
+│       └── tags/[slug].astro
+├── public/
+│   └── favicon.svg
+└── .emdash/
+    └── seed.json          # All field types demonstrated
+```