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.

scripts/logo/contact-sheet.mjs

@@ -116,7 +116,7 @@ async function main() {
   const { computeLogoPlacement, slotFor } = await loadPlacement();
   mkdirSync(OUT_DIR, { recursive: true });
 
-  const sampleRaw = await loadImage(readFileSync(path.join(ROOT, "public/brand/sample-wordmark-logo.png")));
+  const sampleRaw = await loadImage(readFileSync(path.join(ROOT, "src/pdf/testing/fixtures/sample-wordmark-logo.png")));
   const sampleCanvas = createCanvas(sampleRaw.width, sampleRaw.height);
   sampleCanvas.getContext("2d").drawImage(sampleRaw, 0, 0);
   const syn = syntheticLogos(createCanvas);