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/core/src/version.ts

@@ -0,0 +1,12 @@
+/**
+ * Build-time version constants, replaced by tsdown/Vite `define`.
+ * Falls back to "dev" when running uncompiled (tests, dev).
+ */
+
+declare const __EMDASH_VERSION__: string;
+declare const __EMDASH_COMMIT__: string;
+
+export const VERSION: string =
+	typeof __EMDASH_VERSION__ !== "undefined" ? __EMDASH_VERSION__ : "dev";
+
+export const COMMIT: string = typeof __EMDASH_COMMIT__ !== "undefined" ? __EMDASH_COMMIT__ : "dev";