test(e2e): retarget the editor specs at the v4 shell

src/components/ai-edition/NewEditorShell.module.css

@@ -846,6 +846,12 @@
 	align-items: center;
 	gap: var(--sp-2);
 	padding: 12px var(--sp-4);
+	/* Every pane wearing this header is rendered inside FloatingInspector, which
+	   floats its "Collapse inspector" button (right: 12, 26px wide) over the
+	   header's right edge — landing squarely on whatever sits there and
+	   swallowing its clicks. The Help button was the casualty: visible on every
+	   facet, and unclickable. Reserve the floated button its own lane instead. */
+	padding-right: 46px;
 	border-bottom: 1px solid var(--border-soft);
 	min-height: 44px;
 }

tests/e2e/editor-smoke.spec.ts

@@ -0,0 +1,39 @@
+// Boot smoke test for the v4 editor shell: no project seeded, so this is the
+// cold-start path a user hits before they have anything to edit. Its companion
+// `v4-shell.spec.ts` always seeds a document; this one deliberately doesn't —
+// the empty state is its own render branch (Preview → EditorEmptyState) and the
+// only thing that catches a mount-time crash with an empty shim.
+//
+// Needs a dev server: `npm run dev` (default 5173, override with E2E_BASE_URL).
+import { expect, test } from "@playwright/test";
+
+const BASE_URL = process.env.E2E_BASE_URL ?? "http://localhost:5173";
+const EDITOR_URL = `${BASE_URL}/?windowType=editor`;
+
+test("editor boots into the empty state with no project, and logs no console errors", async ({
+	page,
+}) => {
+	const consoleErrors: string[] = [];
+	page.on("console", (msg) => {
+		if (msg.type() === "error") consoleErrors.push(msg.text());
+	});
+	page.on("pageerror", (err) => consoleErrors.push(`pageerror: ${err.message}`));
+
+	// A fresh Playwright context has empty localStorage, so the shell's mount
+	// effect finds no project via listProjects() and renders the empty branch.
+	await page.goto(EDITOR_URL, { waitUntil: "domcontentloaded" });
+
+	// Preview shell — the transport-state hooks the editor exposes to the outside.
+	const preview = page.getByTestId("preview");
+	await expect(preview).toBeVisible();
+	await expect(preview).toHaveAttribute("data-current-time-sec", /^\d+(\.\d+)?$/);
+	await expect(preview).toHaveAttribute("data-is-playing", /^(true|false)$/);
+	await expect(preview).toContainText("No project open");
+
+	// Timeline mounts even with nothing on it (V4Timeline's tools toolbar).
+	await expect(page.getByRole("toolbar", { name: "Timeline tools" })).toBeVisible();
+	// Top bar mounted, defaulting to Edit mode.
+	await expect(page.getByRole("tab", { name: "Edit" })).toHaveAttribute("aria-selected", "true");
+
+	expect(consoleErrors, `console errors:\n${consoleErrors.join("\n")}`).toEqual([]);
+});