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

packages/blocks/src/server.ts

@@ -0,0 +1,49 @@
+/**
+ * Server-safe exports for @emdash-cms/blocks.
+ *
+ * Use this entry point in plugin route handlers and other server-side code
+ * that doesn't have React available. Provides builders, validation, and types
+ * without importing any React components.
+ */
+
+export { blocks, elements } from "./builders.js";
+export { validateBlocks } from "./validation.js";
+
+export type {
+	// Composition objects
+	ConfirmDialog,
+	// Elements
+	ButtonElement,
+	TextInputElement,
+	NumberInputElement,
+	SelectElement,
+	ToggleElement,
+	SecretInputElement,
+	Element,
+	// Form
+	FieldCondition,
+	FormField,
+	// Block sub-types
+	TableColumn,
+	StatItem,
+	// Blocks
+	HeaderBlock,
+	SectionBlock,
+	DividerBlock,
+	FieldsBlock,
+	TableBlock,
+	ActionsBlock,
+	StatsBlock,
+	FormBlock,
+	ImageBlock,
+	ContextBlock,
+	ColumnsBlock,
+	Block,
+	// Interactions
+	BlockAction,
+	FormSubmit,
+	PageLoad,
+	BlockInteraction,
+	// Response
+	BlockResponse,
+} from "./types.js";