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/field-widgets.test.ts

@@ -0,0 +1,187 @@
+/**
+ * Tests for the field widget plugin pipeline.
+ *
+ * Covers:
+ * - Manifest schema validation for fieldWidgets
+ * - definePlugin() with fieldWidgets
+ * - FieldWidgetConfig type correctness
+ */
+
+import { describe, expect, it } from "vitest";
+
+import { pluginManifestSchema } from "../../../src/plugins/manifest-schema.js";
+
+/** Minimal valid manifest */
+function makeManifest(admin: Record<string, unknown> = {}) {
+	return {
+		id: "test-plugin",
+		version: "1.0.0",
+		capabilities: [],
+		allowedHosts: [],
+		storage: {},
+		hooks: [],
+		routes: [],
+		admin,
+	};
+}
+
+describe("pluginManifestSchema — fieldWidgets", () => {
+	it("should accept manifest without fieldWidgets", () => {
+		const result = pluginManifestSchema.safeParse(makeManifest());
+		expect(result.success).toBe(true);
+	});
+
+	it("should accept manifest with empty fieldWidgets array", () => {
+		const result = pluginManifestSchema.safeParse(makeManifest({ fieldWidgets: [] }));
+		expect(result.success).toBe(true);
+	});
+
+	it("should accept a valid field widget definition", () => {
+		const result = pluginManifestSchema.safeParse(
+			makeManifest({
+				fieldWidgets: [
+					{
+						name: "picker",
+						label: "Color Picker",
+						fieldTypes: ["string"],
+					},
+				],
+			}),
+		);
+		expect(result.success).toBe(true);
+	});
+
+	it("should accept multiple field widget definitions", () => {
+		const result = pluginManifestSchema.safeParse(
+			makeManifest({
+				fieldWidgets: [
+					{
+						name: "picker",
+						label: "Color Picker",
+						fieldTypes: ["string"],
+					},
+					{
+						name: "pricing",
+						label: "Pricing Editor",
+						fieldTypes: ["json"],
+						elements: [{ type: "toggle", action_id: "enabled", label: "Enable" }],
+					},
+				],
+			}),
+		);
+		expect(result.success).toBe(true);
+	});
+
+	it("should accept field widget with Block Kit elements", () => {
+		const result = pluginManifestSchema.safeParse(
+			makeManifest({
+				fieldWidgets: [
+					{
+						name: "pricing",
+						label: "Pricing",
+						fieldTypes: ["json"],
+						elements: [
+							{ type: "toggle", action_id: "enabled", label: "Enable" },
+							{ type: "text_input", action_id: "price", label: "Price" },
+							{
+								type: "select",
+								action_id: "mode",
+								label: "Mode",
+								options: [{ value: "a", label: "A" }],
+							},
+						],
+					},
+				],
+			}),
+		);
+		expect(result.success).toBe(true);
+	});
+
+	it("should accept field widget with multiple field types", () => {
+		const result = pluginManifestSchema.safeParse(
+			makeManifest({
+				fieldWidgets: [
+					{
+						name: "hex",
+						label: "Hex Input",
+						fieldTypes: ["string", "json"],
+					},
+				],
+			}),
+		);
+		expect(result.success).toBe(true);
+	});
+
+	it("should reject field widget with empty name", () => {
+		const result = pluginManifestSchema.safeParse(
+			makeManifest({
+				fieldWidgets: [
+					{
+						name: "",
+						label: "Test",
+						fieldTypes: ["string"],
+					},
+				],
+			}),
+		);
+		expect(result.success).toBe(false);
+	});
+
+	it("should reject field widget with empty label", () => {
+		const result = pluginManifestSchema.safeParse(
+			makeManifest({
+				fieldWidgets: [
+					{
+						name: "test",
+						label: "",
+						fieldTypes: ["string"],
+					},
+				],
+			}),
+		);
+		expect(result.success).toBe(false);
+	});
+
+	it("should reject field widget without name", () => {
+		const result = pluginManifestSchema.safeParse(
+			makeManifest({
+				fieldWidgets: [
+					{
+						label: "Test",
+						fieldTypes: ["string"],
+					},
+				],
+			}),
+		);
+		expect(result.success).toBe(false);
+	});
+
+	it("should reject field widget without fieldTypes", () => {
+		const result = pluginManifestSchema.safeParse(
+			makeManifest({
+				fieldWidgets: [
+					{
+						name: "test",
+						label: "Test",
+					},
+				],
+			}),
+		);
+		expect(result.success).toBe(false);
+	});
+
+	it("should accept field widget with empty fieldTypes array", () => {
+		const result = pluginManifestSchema.safeParse(
+			makeManifest({
+				fieldWidgets: [
+					{
+						name: "test",
+						label: "Test",
+						fieldTypes: [],
+					},
+				],
+			}),
+		);
+		expect(result.success).toBe(true);
+	});
+});