Start the setup wizard blank and add a Run setup again button

The first-run seed no longer inserts the original vendor's name, address, contact
details, PAN or bank account; the wizard now starts empty and requires a name and
state. Settings > Data gets a Run setup again button that clears the onboarded flag.
Re-running the wizard keeps the active invoice series unless the prefix or padding
changes. The sample logo moves out of public/ so it no longer ships in the app.

src/components/DataBackupPanel.tsx

@@ -1,7 +1,8 @@
 import { useCallback, useEffect, useState } from "react";
 import { Button, InlineLoading, InlineNotification, Modal, Tile, Toggle } from "@carbon/react";
-import { open, save } from "@tauri-apps/plugin-dialog";
+import { confirm, open, save } from "@tauri-apps/plugin-dialog";
 import { api } from "../lib/api";
+import type { Settings } from "../lib/types";
 import {
   backupFileName,
   ensureZipExtension,
@@ -20,8 +21,15 @@ type RestoreStep = "confirm" | "staging" | "ready";
 const joinPath = (dir: string, name: string) =>
   !dir ? name : /[\\/]$/.test(dir) ? `${dir}${name}` : `${dir}${dir.includes("\\") && !dir.includes("/") ? "\\" : "/"}${name}`;
 
-/** Settings > Data: manual backup, restore (staged, applied after a restart) and the automatic daily backup. */
-export default function DataBackupPanel() {
+interface DataBackupPanelProps {
+  /** The saved settings; "Run setup again" writes them back with the wizard flag cleared. */
+  settings: Settings;
+  /** Called after the flag is cleared, so the app reloads settings and shows the wizard. */
+  onRerunSetup: () => void;
+}
+
+/** Settings > Data: manual backup, restore (staged, applied after a restart), the automatic daily backup and re-running setup. */
+export default function DataBackupPanel({ settings, onRerunSetup }: DataBackupPanelProps) {
   const toast = useToast();
   const [status, setStatus] = useState<BackupStatus | null>(null);
   const [backingUp, setBackingUp] = useState(false);
@@ -32,6 +40,20 @@ export default function DataBackupPanel() {
   const [restarting, setRestarting] = useState(false);
   useReturnFocus(restorePath !== null);
 
+  const rerunSetup = async () => {
+    const ok = await confirm(
+      "Open the setup wizard again? Your invoices, clients and backups are kept, and the wizard starts with your current details.",
+      { title: "Run setup again", kind: "warning" },
+    );
+    if (!ok) return;
+    try {
+      await api.saveSettings({ ...settings, onboarded: false });
+      onRerunSetup();
+    } catch (e) {
+      toast.error("Could not start setup", String(e));
+    }
+  };
+
   const refresh = useCallback(async () => {
     try {
       setStatus(await api.getBackupStatus());
@@ -229,6 +251,19 @@ export default function DataBackupPanel() {
         </div>
       </Tile>
 
+      <Tile>
+        <h2 className="voiced-section-title">Setup wizard</h2>
+        <p className="voiced-muted">
+          Run the first-time setup again to change your business details, logo, bank account and numbering in one go. Existing
+          invoices, clients and backups are not touched, and invoice numbering carries on unless you change the prefix.
+        </p>
+        <div className="voiced-actions">
+          <Button size="md" kind="tertiary" onClick={() => void rerunSetup()}>
+            Run setup again
+          </Button>
+        </div>
+      </Tile>
+
       <Modal
         open={restorePath !== null}
         danger={step === "confirm"}