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/plugins/page-context.test.ts

@@ -0,0 +1,156 @@
+/**
+ * Page Context Tests
+ *
+ * Tests the public page context builder for:
+ * - Astro-like input handling
+ * - URL string and object input
+ * - Default pageType resolution
+ * - Null normalization for optional fields
+ */
+
+import { describe, it, expect } from "vitest";
+
+import { createPublicPageContext } from "../../../src/page/context.js";
+
+describe("createPublicPageContext", () => {
+	it("accepts Astro-like input and extracts url/path/locale", () => {
+		const result = createPublicPageContext({
+			Astro: {
+				url: new URL("https://example.com/blog/hello"),
+				currentLocale: "en",
+			},
+			kind: "content",
+			title: "Hello",
+			pageTitle: "Hello",
+		});
+
+		expect(result.url).toBe("https://example.com/blog/hello");
+		expect(result.path).toBe("/blog/hello");
+		expect(result.locale).toBe("en");
+		expect(result.title).toBe("Hello");
+		expect(result.pageTitle).toBe("Hello");
+	});
+
+	it("accepts URL string input", () => {
+		const result = createPublicPageContext({
+			url: "https://example.com/about",
+			kind: "custom",
+			locale: "fr",
+		});
+
+		expect(result.url).toBe("https://example.com/about");
+		expect(result.path).toBe("/about");
+		expect(result.locale).toBe("fr");
+	});
+
+	it("accepts URL object input", () => {
+		const urlObj = new URL("https://example.com/products?page=2");
+
+		const result = createPublicPageContext({
+			url: urlObj,
+			kind: "custom",
+		});
+
+		expect(result.url).toBe("https://example.com/products?page=2");
+		expect(result.path).toBe("/products");
+	});
+
+	it('defaults pageType to "article" for content kind', () => {
+		const result = createPublicPageContext({
+			url: "https://example.com/post/1",
+			kind: "content",
+		});
+
+		expect(result.pageType).toBe("article");
+	});
+
+	it('defaults pageType to "website" for custom kind', () => {
+		const result = createPublicPageContext({
+			url: "https://example.com/",
+			kind: "custom",
+		});
+
+		expect(result.pageType).toBe("website");
+	});
+
+	it("normalizes undefined locale to null", () => {
+		const result = createPublicPageContext({
+			Astro: {
+				url: new URL("https://example.com/"),
+				// currentLocale not set
+			},
+			kind: "custom",
+		});
+
+		expect(result.locale).toBeNull();
+	});
+
+	it("normalizes undefined pageTitle to null", () => {
+		const result = createPublicPageContext({
+			url: "https://example.com/about",
+			kind: "custom",
+			title: "About | My Site",
+		});
+
+		expect(result.pageTitle).toBeNull();
+	});
+
+	it("normalizes content slug undefined to null", () => {
+		const result = createPublicPageContext({
+			url: "https://example.com/post/1",
+			kind: "content",
+			content: { collection: "posts", id: "abc123" },
+		});
+
+		expect(result.content).toBeDefined();
+		expect(result.content!.slug).toBeNull();
+		expect(result.content!.collection).toBe("posts");
+		expect(result.content!.id).toBe("abc123");
+	});
+
+	it("sets content to undefined for custom kind", () => {
+		const result = createPublicPageContext({
+			url: "https://example.com/about",
+			kind: "custom",
+		});
+
+		expect(result.content).toBeUndefined();
+	});
+
+	it("passes breadcrumbs through verbatim when provided", () => {
+		const result = createPublicPageContext({
+			url: "https://example.com/blog/hello",
+			kind: "content",
+			breadcrumbs: [
+				{ name: "Home", url: "/" },
+				{ name: "Blog", url: "/blog/" },
+				{ name: "Hello", url: "/blog/hello" },
+			],
+		});
+
+		expect(result.breadcrumbs).toEqual([
+			{ name: "Home", url: "/" },
+			{ name: "Blog", url: "/blog/" },
+			{ name: "Hello", url: "/blog/hello" },
+		]);
+	});
+
+	it("leaves breadcrumbs undefined when not provided", () => {
+		const result = createPublicPageContext({
+			url: "https://example.com/about",
+			kind: "custom",
+		});
+
+		expect(result.breadcrumbs).toBeUndefined();
+	});
+
+	it("preserves explicit empty breadcrumbs array (opt-out signal)", () => {
+		const result = createPublicPageContext({
+			url: "https://example.com/",
+			kind: "custom",
+			breadcrumbs: [],
+		});
+
+		expect(result.breadcrumbs).toEqual([]);
+	});
+});