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/pdf/templates/harness.ts

@@ -166,7 +166,7 @@ export function fixtureLogo(kind: LogoKind): LogoInput | null {
   if (!hit) {
     if (kind === "real") {
       // 2172 x 724: the untrimmed Test Vendor logo, a 3:1 aspect.
-      const png = readFileSync(path.resolve(process.cwd(), "public/brand/sample-wordmark-logo.png"));
+      const png = readFileSync(path.resolve(process.cwd(), "src/pdf/testing/fixtures/sample-wordmark-logo.png"));
       const [width, height] = [png.readUInt32BE(16), png.readUInt32BE(20)];
       hit = { dataUri: dataUri(png), width, height, aspect: width / height, density: 0.21, kind: "wordmark", includesName: true };
     } else if (kind === "knockout") {