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/tests/integration/fixture/astro.config.mjs

@@ -0,0 +1,51 @@
+/**
+ * Minimal Astro config for e2e tests.
+ *
+ * Uses EMDASH_TEST_DB env var for the database path so each
+ * test run gets an isolated database.
+ */
+import node from "@astrojs/node";
+import react from "@astrojs/react";
+import { colorPlugin } from "@emdash-cms/plugin-color";
+import { defineConfig } from "astro/config";
+import emdash, { local } from "emdash/astro";
+import { sqlite } from "emdash/db";
+
+const dbUrl = process.env.EMDASH_TEST_DB || "file:./test.db";
+const uploadsDir = process.env.EMDASH_TEST_UPLOADS || "./uploads";
+const _rawMaxUploadSize = process.env.EMDASH_MAX_UPLOAD_SIZE
+	? parseInt(process.env.EMDASH_MAX_UPLOAD_SIZE, 10)
+	: undefined;
+const maxUploadSize =
+	_rawMaxUploadSize !== undefined && Number.isFinite(_rawMaxUploadSize) && _rawMaxUploadSize > 0
+		? _rawMaxUploadSize
+		: undefined;
+
+export default defineConfig({
+	output: "server",
+	adapter: node({ mode: "standalone" }),
+	integrations: [
+		react(),
+		emdash({
+			database: sqlite({ url: dbUrl }),
+			storage: local({ directory: uploadsDir, baseUrl: "/_emdash/api/media/file" }),
+			maxUploadSize,
+			plugins: [colorPlugin()],
+		}),
+	],
+	i18n: {
+		defaultLocale: "en",
+		locales: ["en", "fr", "es"],
+		fallback: { fr: "en", es: "en" },
+	},
+	devToolbar: { enabled: false },
+	vite: {
+		server: {
+			fs: {
+				// When running from a temp dir, node_modules is symlinked back to the
+				// monorepo. Vite needs permission to serve files from the real paths.
+				strict: false,
+			},
+		},
+	},
+});