test(documents): wait for the vault to book the Coach hand-off

The maximize case clicked the drawer's maximize control as soon as the drawer
was on screen. Those are not the same event: the vault records `?doc=` as the
way back only once the detail sheet has actually closed with the drawer owning
the same document, and maximizing before that sends the close down the other
branch, which calls `history.back()` and races the push to `/coach`. The URL
then stays on `/documents` and nothing is raised. The sheet's own close control
leaves the tree with the sheet, so its absence is that hand-off, observed.

The delete case is addressed to the toast's attributes rather than its copy.
The literal there has already been wrong once — a trailing full stop moved and
the assertion spent its whole timeout hunting a sentence that no longer
existed, on every attempt, on both projects.

e2e/documents.spec.ts

@@ -345,6 +345,16 @@ test.describe("document vault", () => {
     await detail.locator('[data-slot="document-chat-open"]').click();
     const drawer = page.locator('[data-slot="coach-drawer"]');
     await expect(drawer).toBeVisible();
+    // The drawer being on screen is not the same event as the vault having
+    // recorded the hand-off. The page books `?doc=` as the way back only once
+    // the detail sheet is actually closed with the drawer owning the same
+    // document; maximize before that and the close path takes the other branch
+    // — `history.back()` — which races the push to `/coach` and lands back on
+    // `/documents` with nothing raised. The sheet's own close control leaves
+    // the tree with the sheet, so its absence is that hand-off, observed.
+    await expect(
+      page.locator('[data-slot="document-detail-close"]'),
+    ).toHaveCount(0);
     await drawer.locator('[data-slot="coach-drawer-maximize"]').click();
     await expect.poll(() => new URL(page.url()).pathname).toBe("/coach");
     expect(new URL(page.url()).searchParams.get("doc")).toBe(MRT_DOC_ID);
@@ -392,11 +402,19 @@ test.describe("document vault", () => {
     await sheet.getByRole("button", { name: "Delete" }).click();
 
     // Undo toast → restore → the card returns.
-    await expect(
-      page.getByText("Document deleted", { exact: true }),
-    ).toBeVisible();
+    //
+    // Addressed to the toast's own attributes, not to its copy. The copy is
+    // i18n-driven and the literal here has already been wrong once — a trailing
+    // full stop moved and the assertion spent its whole timeout looking for a
+    // sentence that no longer existed, on every attempt, on both projects. The
+    // success type is what the delete claims and the action button is what the
+    // undo needs; both are structural.
+    const undo = page.locator(
+      '[data-sonner-toast][data-type="success"] [data-button]',
+    );
+    await expect(undo).toBeVisible();
     await expect(openButton(page, `${title}.pdf`)).not.toBeVisible();
-    await page.getByRole("button", { name: "Undo" }).click();
+    await undo.click();
     await expect(openButton(page, `${title}.pdf`)).toBeVisible();
   });