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/unit/templates/blog-site-identity.test.ts

@@ -0,0 +1,75 @@
+import { describe, expect, it } from "vitest";
+
+import { resolveBlogSiteIdentity as resolveBlogSiteIdentityCloudflare } from "../../../../../templates/blog-cloudflare/src/utils/site-identity";
+import { resolveBlogSiteIdentity as resolveBlogSiteIdentityNode } from "../../../../../templates/blog/src/utils/site-identity";
+
+describe("blog template site identity", () => {
+	it("uses CMS site title and tagline when provided", () => {
+		// Favicon is intentionally absent from the helper return: core's
+		// EmDashHead now emits the favicon link via renderSiteIdentity()
+		// (#831), so the template no longer needs to surface it.
+		const settings = {
+			title: "Example Site",
+			tagline: "Writing about shipping software",
+			logo: { mediaId: "logo-1", alt: "My Logo", url: "/_emdash/api/media/file/logo.webp" },
+			favicon: { mediaId: "fav-1", url: "/_emdash/api/media/file/favicon.svg" },
+		};
+
+		expect(resolveBlogSiteIdentityNode(settings)).toEqual({
+			siteTitle: "Example Site",
+			siteTagline: "Writing about shipping software",
+			siteLogo: { mediaId: "logo-1", alt: "My Logo", url: "/_emdash/api/media/file/logo.webp" },
+		});
+		expect(resolveBlogSiteIdentityCloudflare(settings)).toEqual({
+			siteTitle: "Example Site",
+			siteTagline: "Writing about shipping software",
+			siteLogo: { mediaId: "logo-1", alt: "My Logo", url: "/_emdash/api/media/file/logo.webp" },
+		});
+	});
+
+	it("falls back to the bundled blog defaults when settings are missing", () => {
+		expect(resolveBlogSiteIdentityNode({})).toEqual({
+			siteTitle: "My Blog",
+			siteTagline: "Thoughts, stories, and ideas.",
+			siteLogo: null,
+		});
+		expect(resolveBlogSiteIdentityCloudflare({})).toEqual({
+			siteTitle: "My Blog",
+			siteTagline: "Thoughts, stories, and ideas.",
+			siteLogo: null,
+		});
+	});
+
+	it("preserves intentionally blank settings instead of restoring defaults", () => {
+		const settings = {
+			title: "Example Site",
+			tagline: "",
+			siteLogo: "",
+		};
+
+		expect(resolveBlogSiteIdentityNode(settings)).toEqual({
+			siteTitle: "Example Site",
+			siteTagline: "",
+			siteLogo: null,
+		});
+		expect(resolveBlogSiteIdentityCloudflare(settings)).toEqual({
+			siteTitle: "Example Site",
+			siteTagline: "",
+			siteLogo: null,
+		});
+	});
+
+	it("returns null for logo without resolved URL", () => {
+		const settings = {
+			title: "Example Site",
+			tagline: "",
+			logo: { mediaId: "logo-1" },
+		};
+
+		expect(resolveBlogSiteIdentityNode(settings)).toEqual({
+			siteTitle: "Example Site",
+			siteTagline: "",
+			siteLogo: null,
+		});
+	});
+});