fix: preserve blank-name backups and open linked bill editors

src/export/json.test.ts

@@ -6,6 +6,7 @@ import {
   ImportValidationError,
   exportFilename,
 } from "./json.ts";
+import { addRecurringCost, updatePost, updateRecurringCost } from "../store/actions.ts";
 import { createSeedDataset } from "../domain/seed.ts";
 import { monthView, yearView } from "../domain/views.ts";
 import type { Dataset } from "../domain/types.ts";
@@ -164,21 +165,33 @@ describe("import rejects invalid folder graph", () => {
     expect(() => parse(data)).toThrow(ImportValidationError);
   });
 
-  test("rejects a blank post name", () => {
+  test.each([
+    ["", "Rent"], ["  ", "Rent"], ["Games", ""], ["Games", "  "],
+  ])("blank item names (%j, %j) survive saved dataset round trips and v7 import", (postName, billName) => {
     const data = populated();
-    data.posts[0]!.name = "  ";
-    expect(() => parse(data)).toThrow(ImportValidationError);
-  });
-
-  test("rejects a blank recurring-cost name", () => {
-    const data = populated();
-    data.recurring.push({
-      id: "rent", name: "  ", order: 3, folderId: null, archived: false,
+    const bill = addRecurringCost(data, {
+      name: "Rent", folderId: null, archived: false,
       amount: { amount: 100, currency: "DKK" }, startDate: "2026-01",
       recurrence: { kind: "everyNMonths", n: 1 }, anchoring: "calendar",
       splitMode: "percent", splits: [{ postId: data.posts[0]!.id, value: 100, absorbsRemainder: true }],
     });
-    expect(() => parse(data)).toThrow(ImportValidationError);
+    updatePost(data, data.posts[0]!.id, { name: postName });
+    updateRecurringCost(data, bill.id, { name: billName });
+    expect(parseDatasetJson(exportDatasetJson(data))).toEqual(data);
+    const legacy = JSON.parse(exportDatasetJson(data));
+    legacy.settings.schemaVersion = 7;
+    delete legacy.folders;
+    for (const item of [...legacy.posts, ...legacy.recurring]) delete item.folderId;
+    const imported = parseDatasetJson(JSON.stringify(legacy));
+    expect(imported.posts[0]!.name).toBe(postName);
+    expect(imported.recurring[0]!.name).toBe(billName);
+    expect(imported.folders).toEqual([]);
+  });
+
+  test.each(["", "  "])("still rejects blank folder names %j", name => {
+    const data = populated();
+    data.folders = [{ ...folder("home", null, data.posts.length), name }];
+    expect(() => parse(data)).toThrow(/empty name/);
   });
 });
 

src/export/json.ts

@@ -190,14 +190,14 @@ function requireFolderTree(data: Dataset): void {
     requireLocation(folder.parentId, folder.order, `Folder "${folder.id}"`);
   }
   for (const post of data.posts) {
-    if (typeof post?.name !== "string" || !post.name.trim()) {
-      throw new ImportValidationError("Post has an empty name");
+    if (typeof post?.name !== "string") {
+      throw new ImportValidationError("Post name must be a string");
     }
     requireLocation(post?.folderId, post?.order, `Post "${post?.name}"`);
   }
   for (const cost of data.recurring) {
-    if (typeof cost?.name !== "string" || !cost.name.trim()) {
-      throw new ImportValidationError("Recurring cost has an empty name");
+    if (typeof cost?.name !== "string") {
+      throw new ImportValidationError("Recurring cost name must be a string");
     }
     requireLocation(cost?.folderId, cost?.order, `Recurring cost "${cost?.name}"`);
   }

src/ui/routes/SettingsRoute.test.tsx

@@ -0,0 +1,51 @@
+import { expect, test } from "bun:test";
+import { GlobalRegistrator } from "@happy-dom/global-registrator";
+if (!GlobalRegistrator.isRegistered) GlobalRegistrator.register();
+(globalThis as { IS_REACT_ACT_ENVIRONMENT?: boolean }).IS_REACT_ACT_ENVIRONMENT = true;
+import { act } from "react";
+import { createRoot } from "react-dom/client";
+import { Link, MemoryRouter, Route, Routes } from "react-router";
+import { createSeedDataset } from "../../domain/seed.ts";
+import { addRecurringCost } from "../../store/actions.ts";
+import { store } from "../../store/index.ts";
+import { monthView } from "../../domain/views.ts";
+import { BudgetTree } from "../components/BudgetTree.tsx";
+import { SettingsRoute } from "./SettingsRoute.tsx";
+
+test("month bill Edit navigates to Settings, opens and focuses its editor; fragment changes retarget it", () => {
+  const data = createSeedDataset("2026-09");
+  const bill = addRecurringCost(data, {
+    name: "Phone", folderId: null, archived: false,
+    amount: { amount: 30, currency: "DKK" }, startDate: "2026-09",
+    recurrence: { kind: "everyNMonths", n: 1 }, anchoring: "calendar",
+    splitMode: "percent", splits: [{ postId: data.posts[0]!.id, value: 100, absorbsRemainder: true }],
+  });
+  const second = addRecurringCost(data, { ...bill, name: "Internet" });
+  const original = { get: store.get, subscribe: store.subscribe };
+  store.get = () => data;
+  store.subscribe = () => () => {};
+  const container = document.createElement("div");
+  document.body.append(container);
+  const root = createRoot(container);
+  try {
+    act(() => root.render(<MemoryRouter initialEntries={["/month/2026-09"]}>
+      <Link id="second-bill" to={`/settings#bill-${second.id}`}>Other bill</Link>
+      <Link id="missing-bill" to="/settings#bill-missing">Missing bill</Link>
+      <Routes>
+        <Route path="/month/:month" element={<BudgetTree monthId="2026-09" rows={monthView(data, "2026-09").rows} />} />
+        <Route path="/settings" element={<SettingsRoute />} />
+      </Routes>
+    </MemoryRouter>));
+    act(() => (container.querySelector(`[data-budget-item="${bill.id}"] a`) as HTMLAnchorElement).click());
+    expect(container.textContent).toContain("Save destinations");
+    expect(document.activeElement?.id).toBe(`bill-${bill.id}`);
+    act(() => (container.querySelector("#second-bill") as HTMLAnchorElement).click());
+    expect(document.activeElement?.id).toBe(`bill-${second.id}`);
+    const editorRow = container.querySelector(`[data-bill-id="${second.id}"]`)!.nextElementSibling!;
+    expect(editorRow.textContent).toContain("Save destinations");
+    act(() => (container.querySelector("#missing-bill") as HTMLAnchorElement).click());
+    expect(container.textContent).toContain("Recurring costs");
+  } finally {
+    act(() => root.unmount()); container.remove(); Object.assign(store, original);
+  }
+});

src/ui/routes/SettingsRoute.tsx

@@ -1,3 +1,5 @@
+import { useEffect } from "react";
+import { useLocation } from "react-router";
 import { CurrencySection } from "./settings/CurrencySection.tsx";
 import { BudgetFoldersSection } from "./settings/BudgetFoldersSection.tsx";
 import { PostsSection } from "./settings/PostsSection.tsx";
@@ -18,6 +20,18 @@ import { ColophonSection } from "./settings/ColophonSection.tsx";
  * "remove" against the card edge.
  */
 export function SettingsRoute() {
+  const location = useLocation();
+  useEffect(() => {
+    // BrowserRouter updates the URL without native fragment navigation. Run
+    // after the settings rows mount, and again for navigation within Settings.
+    if (!location.hash.startsWith("#bill-")) return;
+    const target = document.getElementById(location.hash.slice(1));
+    if (!(target instanceof HTMLButtonElement)) return;
+    target.click();
+    target.focus({ preventScroll: true });
+    target.scrollIntoView({ block: "center" });
+  }, [location.key, location.hash]);
+
   return (
     <div className="space-y-5">
       <h1 className="text-2xl">Settings</h1>