Add PAP-2351 BindingPicker screenshot capture script

Wraps a tiny static HTTP server around `ui/storybook-static` and
runs Playwright to screenshot the `Product/Secrets > BindingPicker`
story at 1440x900 dark mode. Used to verify the fixture-wiring fix
and re-attach the active-bound happy-path screenshot for the
Phase 6 UX review on PAP-2351 / PAP-2350.

Co-Authored-By: Paperclip <noreply@paperclip.ing>

scripts/capture-pap-2351-binding-picker.mjs

@@ -0,0 +1,115 @@
+#!/usr/bin/env node
+// Captures the BindingPicker storybook screenshot for PAP-2351 re-review.
+// Boots a tiny static server over `ui/storybook-static` and screenshots the
+// happy-path picker grid in dark mode at 1440x900 (matches the original
+// PAP-2350 capture).
+
+import { createRequire } from "node:module";
+const localRequire = createRequire(import.meta.url);
+const { chromium } = localRequire("playwright");
+import http from "node:http";
+import { promises as fs } from "node:fs";
+import path from "node:path";
+import { fileURLToPath } from "node:url";
+
+const __dirname = path.dirname(fileURLToPath(import.meta.url));
+const repoRoot = path.resolve(__dirname, "..");
+const storybookRoot = path.join(repoRoot, "ui", "storybook-static");
+const outDir = process.argv[2]
+  ? path.resolve(process.argv[2])
+  : path.join(repoRoot, "screenshots", "pap-2351");
+
+const MIME = {
+  ".html": "text/html",
+  ".js": "application/javascript",
+  ".mjs": "application/javascript",
+  ".css": "text/css",
+  ".json": "application/json",
+  ".svg": "image/svg+xml",
+  ".png": "image/png",
+  ".jpg": "image/jpeg",
+  ".woff": "font/woff",
+  ".woff2": "font/woff2",
+  ".ico": "image/x-icon",
+  ".map": "application/json",
+};
+
+function startStaticServer(rootDir) {
+  return new Promise((resolve) => {
+    const server = http.createServer(async (req, res) => {
+      try {
+        const urlPath = decodeURIComponent((req.url ?? "/").split("?")[0]);
+        let filePath = path.join(rootDir, urlPath === "/" ? "index.html" : urlPath);
+        let stat;
+        try {
+          stat = await fs.stat(filePath);
+        } catch {
+          stat = null;
+        }
+        if (stat?.isDirectory()) {
+          filePath = path.join(filePath, "index.html");
+          stat = await fs.stat(filePath).catch(() => null);
+        }
+        if (!stat) {
+          res.statusCode = 404;
+          res.end("not found");
+          return;
+        }
+        const ext = path.extname(filePath).toLowerCase();
+        res.setHeader("content-type", MIME[ext] ?? "application/octet-stream");
+        res.setHeader("cache-control", "no-cache");
+        const data = await fs.readFile(filePath);
+        res.end(data);
+      } catch (err) {
+        res.statusCode = 500;
+        res.end(err.message);
+      }
+    });
+    server.listen(0, "127.0.0.1", () => {
+      const address = server.address();
+      const port = typeof address === "object" && address ? address.port : 0;
+      resolve({ server, baseUrl: `http://127.0.0.1:${port}` });
+    });
+  });
+}
+
+const SHOTS = [
+  {
+    storyId: "product-secrets--binding-picker",
+    label: "secrets-binding-picker",
+    viewport: { width: 1440, height: 900 },
+    theme: "dark",
+  },
+];
+
+async function main() {
+  await fs.mkdir(outDir, { recursive: true });
+  const { server, baseUrl } = await startStaticServer(storybookRoot);
+  const browser = await chromium.launch();
+  const ctx = await browser.newContext({ deviceScaleFactor: 1 });
+  const page = await ctx.newPage();
+  const captured = [];
+  try {
+    for (const shot of SHOTS) {
+      await page.setViewportSize(shot.viewport);
+      const url = `${baseUrl}/iframe.html?id=${encodeURIComponent(shot.storyId)}&viewMode=story&globals=theme:${shot.theme}`;
+      await page.goto(url, { waitUntil: "networkidle", timeout: 30_000 });
+      // Allow the storybook fixture to swap CompanyContext to the storybook id and
+      // for the picker's useQuery to settle from cache.
+      await page.waitForTimeout(1500);
+      const dest = path.join(outDir, `${shot.label}.png`);
+      await page.screenshot({ path: dest, fullPage: false });
+      captured.push(dest);
+      console.log("captured", dest);
+    }
+  } finally {
+    await browser.close();
+    server.close();
+  }
+  console.log(JSON.stringify({ captured }, null, 2));
+}
+
+main().catch((err) => {
+  console.error(err);
+  process.exit(1);
+});