5 files changed, 423 insertions, 0 deletions
diff --git a/tools/lnurl-auth-test.js b/tools/lnurl-auth-test.js
new file mode 100644
index 0000000..767e85c
--- /dev/null
+++ b/tools/lnurl-auth-test.js
@@ -0,0 +1,102 @@
+// A site's login lnurl (LNURL-auth) pasted into Send is a login, not a
+// payment: the wallet asks first, naming the site, then signs the challenge
+// and tells the site; the site's refusal is shown as its own words. Against
+// a stand-in login server that checks the signature the way a real one does.
+// Run: bun tools/lnurl-auth-test.js
+import puppeteer from './puppeteer.js';
+import { generateMnemonic } from '@scure/bip39';
+import { wordlist } from '@scure/bip39/wordlists/english';
+import { secp256k1 } from '@noble/curves/secp256k1';
+import { hexToBytes } from '@noble/hashes/utils';
+import { encodeLnurl } from '../src/lnurl.js';
+import { buildHtml } from '../build.js';
+const sleep = (ms) => new Promise((r) => setTimeout(r, ms));
+let ok = true;
+const check = (n, c, d = '') => { console.log(` ${c ? '✓' : '✗'} ${n}${d ? ' — ' + d : ''}`); if (!c) ok = false; };
+const html = await buildHtml({ minify: true, pwa: false });
+const logins = []; // what the stand-in site was told
+const server = Bun.serve({ port: 0, fetch: (req) => {
+  const u = new URL(req.url), p = u.pathname;
+  if (p === '/lnauth') {
+    const sig = u.searchParams.get('sig'), key = u.searchParams.get('key'), k1 = u.searchParams.get('k1');
+    if (!sig) return Response.json({ status: 'ERROR', reason: 'no sig query variable provided' });
+    let good = false;
+    try { good = secp256k1.verify(secp256k1.Signature.fromDER(sig), hexToBytes(k1), hexToBytes(key)); } catch {}
+    logins.push({ k1, key, good });
+    return Response.json(good ? { status: 'OK' } : { status: 'ERROR', reason: 'bad signature' });
+  }
+  if (p === '/lnauth-closed') return Response.json({ status: 'ERROR', reason: 'registrations are closed' });
+  if (p.startsWith('/punks') || p === '/verify-worker.js' || p.startsWith('/locales') || /\.js$/.test(p)) { const f = Bun.file('dist' + p); return f.size ? new Response(f) : new Response('', { status: 404 }); }
+  return new Response(html, { headers: { 'content-type': 'text/html' } });
+} });
+const k1 = 'c0ffee'.repeat(10) + 'abcd';
+const loginLnurl = encodeLnurl(server.url.origin + '/lnauth?tag=login&k1=' + k1 + '&action=login');
+const closedLnurl = encodeLnurl(server.url.origin + '/lnauth-closed?tag=login&k1=' + k1 + '&action=register');
+const browser = await puppeteer.launch({ executablePath: process.env.CHROME || '/usr/bin/google-chrome', headless: 'new', args: ['--no-sandbox'] });
+const ctx = browser.defaultBrowserContext();
+await ctx.overridePermissions(server.url.origin, ['clipboard-read', 'clipboard-write', 'clipboard-sanitized-write']);
+const page = await browser.newPage();
+const errs = []; page.on('pageerror', (e) => errs.push(String(e)));
+const click = (t) => page.evaluate((x) => { const e = [...document.querySelectorAll('button')].find((n) => n.textContent.trim().toLowerCase() === x || n.textContent.trim().toLowerCase().includes(x)); if (e) { e.click(); return true; } return false; }, t);
+const text = () => page.evaluate(() => document.body.innerText);
+const waitText = async (x, ms = 8000) => { for (let i = 0; i < ms / 200; i++) { if ((await text()).includes(x)) return true; await sleep(200); } return false; };
+const freshSend = async () => {
+  await page.evaluate(() => [...document.querySelectorAll('button')].find((b) => b.textContent.trim() === 'Receive')?.click()); await sleep(300);
+  await page.evaluate(() => [...document.querySelectorAll('button')].find((b) => b.textContent.trim() === 'Send')?.click());
+  await page.waitForSelector('textarea.send-dest', { timeout: 10000 });
+  await page.$eval('textarea.send-dest', (e) => { e.value = ''; e.dispatchEvent(new Event('input', { bubbles: true })); }); await sleep(300);
+  await page.focus('textarea.send-dest');
+};
+const paste = async (s) => { await page.evaluate((v) => navigator.clipboard.writeText(v), s); await page.keyboard.down('Control'); await page.keyboard.press('KeyV'); await page.keyboard.up('Control'); };
+try {
+  await page.setViewport({ width: 390, height: 844 });
+  await page.goto(server.url.origin, { waitUntil: 'domcontentloaded' });
+  await sleep(400);
+  await click('create a new wallet'); await sleep(500); await click('to import'); await sleep(400);
+  await page.waitForSelector('textarea'); await page.type('textarea', generateMnemonic(wordlist)); await click('open wallet');
+  for (let i = 0; i < 80 && !(await page.evaluate(() => [...document.querySelectorAll('button')].some((b) => b.textContent.trim() === 'Send'))); i++) {
+    await page.evaluate(() => [...document.querySelectorAll('button')].find((b) => /^(not now|skip|continue|later)$/i.test(b.textContent.trim()))?.click());
+    await sleep(400);
+  }
+  await sleep(3000);
+  const host = new URL(server.url.origin).hostname;
+
+  console.log('[a login lnurl pasted into Send]');
+  await freshSend();
+  await paste(loginLnurl);
+  check('the wallet asks first, naming the site', await waitText('Log in with Lightning') && (await text()).includes(host + ' is asking you to log in'), (await text()).slice(0, 200));
+  check('…says what it is about to do, and that nothing is paid', /key it keeps for this site alone/.test(await text()) && /No payment is made/.test(await text()));
+  check('…no amount field, no payment flow', !(await page.$('input[type=number]')));
+  check('nothing was sent to the site before the user agreed', logins.length === 0);
+  await click('log in');
+  check('the site accepts the signed challenge', await waitText('Logged in to ' + host, 8000), (await text()).slice(0, 300));
+  check('…it was told once, with a signature that verifies under the key', logins.length === 1 && logins[0].good && logins[0].k1 === k1, JSON.stringify(logins));
+  const key1 = logins[0].key;
+  await click('done');
+  check('Done returns to a blank Send form', await page.waitForSelector('textarea.send-dest', { timeout: 5000 }).then(() => true, () => false) && (await page.$eval('textarea.send-dest', (e) => e.value)) === '');
+
+  console.log('[the same site again: the same key]');
+  await freshSend();
+  await paste(loginLnurl);
+  await waitText('Log in with Lightning'); await click('log in');
+  await waitText('Logged in to ' + host, 8000);
+  check('the wallet is the same user on the site next time', logins.length === 2 && logins[1].key === key1, JSON.stringify(logins.map((l) => l.key.slice(0, 12))));
+  await click('done');
+
+  console.log('[a site that says no]');
+  await freshSend();
+  await paste(closedLnurl);
+  check('a register link asks to create an account', await waitText('asking you to create an account'));
+  await click('create account');
+  check("the site's reason is shown", await waitText('registrations are closed', 8000), (await text()).slice(0, 300));
+  check('…with a way to try again, and back', (await text()).includes('Try again') && (await text()).includes('Back'));
+  await click('back');
+  check('Back leaves the login', await page.waitForSelector('textarea.send-dest', { timeout: 5000 }).then(() => true, () => false));
+  check('no page errors', errs.length === 0, errs.join('; ').slice(0, 300));
+} catch (e) {
+  check('run completed', false, e.stack);
+} finally {
+  await browser.close(); server.stop(true);
+}
+console.log(ok ? '\n✅ a login lnurl logs in' : '\n❌ failures above');
+process.exit(ok ? 0 : 1);
diff --git a/tools/lnurl-auth-unit-test.js b/tools/lnurl-auth-unit-test.js
new file mode 100644
index 0000000..c9989be
--- /dev/null
+++ b/tools/lnurl-auth-unit-test.js
@@ -0,0 +1,63 @@
+// LNURL-auth (LUD-04/05) without a browser: a login lnurl is told from a
+// pay one; the linking key is the same for a domain every time and different
+// per domain; the signature over k1 verifies under the key sent.
+// Run: bun tools/lnurl-auth-unit-test.js
+import assert from 'node:assert/strict';
+import { HDKey } from '@scure/bip32';
+import { mnemonicToSeedSync } from '@scure/bip39';
+import { secp256k1 } from '@noble/curves/secp256k1';
+import { bytesToHex, hexToBytes } from '@noble/hashes/utils';
+import { encodeLnurl, parseLnurlAuth, lnurlAuthKey, lnurlAuthLogin } from '../src/lnurl.js';
+const k1 = 'a'.repeat(64);
+const loginUrl = 'https://stacker.news/api/lnauth?tag=login&k1=' + k1 + '&action=login';
+const a = parseLnurlAuth(encodeLnurl(loginUrl));
+assert.deepEqual(a, { url: loginUrl, domain: 'stacker.news', k1, action: 'login' });
+assert.equal(parseLnurlAuth('lightning:' + encodeLnurl(loginUrl).toUpperCase()).domain, 'stacker.news', 'a lightning: prefix and upper case are fine');
+assert.equal(parseLnurlAuth(encodeLnurl('https://stacker.news/api/lnauth?tag=login&k1=zz')), null, 'a k1 that is not 32 bytes is not a login');
+assert.equal(parseLnurlAuth(encodeLnurl('https://coinos.io/.well-known/lnurlp/adam')), null, 'a pay lnurl is not a login');
+assert.equal(parseLnurlAuth('[email protected]'), null);
+assert.equal(parseLnurlAuth(encodeLnurl(loginUrl.replace('action=login', 'action=register'))).action, 'register');
+assert.equal(parseLnurlAuth(encodeLnurl(loginUrl.replace('action=login', 'action=what'))).action, 'login', 'an unknown action is a login');
+const master = HDKey.fromMasterSeed(mnemonicToSeedSync('abandon abandon abandon abandon abandon abandon abandon abandon abandon abandon abandon about'));
+const k = lnurlAuthKey(master, 'stacker.news');
+assert.equal(bytesToHex(k.publicKey), bytesToHex(lnurlAuthKey(master, 'stacker.news').publicKey), 'the same key for a domain every time');
+assert.notEqual(bytesToHex(k.publicKey), bytesToHex(lnurlAuthKey(master, 'coinos.io').publicKey), 'another domain, another key');
+assert.equal(k.publicKey.length, 33, 'a compressed public key');
+assert.notEqual(bytesToHex(lnurlAuthKey(HDKey.fromMasterSeed(mnemonicToSeedSync('zoo zoo zoo zoo zoo zoo zoo zoo zoo zoo zoo wrong')), 'stacker.news').publicKey), bytesToHex(k.publicKey), 'another wallet, another user');
+// the callback, with a server that checks the signature the way theirs does
+let got = null;
+globalThis.fetch = async (url) => {
+  const u = new URL(url);
+  got = { sig: u.searchParams.get('sig'), key: u.searchParams.get('key'), k1: u.searchParams.get('k1'), tag: u.searchParams.get('tag') };
+  const okSig = secp256k1.verify(secp256k1.Signature.fromDER(got.sig), hexToBytes(got.k1), hexToBytes(got.key));
+  return new Response(JSON.stringify(okSig ? { status: 'OK' } : { status: 'ERROR', reason: 'bad sig' }), { headers: { 'content-type': 'application/json' } });
+};
+const r = await lnurlAuthLogin(a, k);
+assert.equal(got.tag, 'login'); assert.equal(got.k1, k1);
+assert.equal(got.key, bytesToHex(k.publicKey), 'the key sent is the linking key');
+assert.equal(r.key, got.key);
+assert.match(got.sig, /^30[0-9a-f]+$/, 'a DER signature');
+globalThis.fetch = async () => new Response(JSON.stringify({ status: 'ERROR', reason: 'no such user' }), { headers: { 'content-type': 'application/json' } });
+await assert.rejects(lnurlAuthLogin(a, k), /no such user/, "the server's reason is the error");
+console.log('✓ lnurl-auth: a login is told from a payment, one key per site per wallet, the signature verifies, the server has the last word');
+
+// ---- LNURL-withdraw (LUD-03) ----
+const { parseZapTarget, withdrawParamsOf, fetchWithdrawParams, submitWithdraw, fetchPayParams } = await import('../src/lnurl.js');
+const w = parseZapTarget('lnurlw://pay.example.com/withdraw?k=1');
+assert.equal(w.url, 'https://pay.example.com/withdraw?k=1', 'lnurlw:// is the URL over https');
+assert.equal(parseZapTarget('LIGHTNING:lnurlp://pay.example.com/.well-known/lnurlp/bob').url, 'https://pay.example.com/.well-known/lnurlp/bob');
+assert.equal(parseZapTarget('lnurlw://abc.onion/w').url, 'http://abc.onion/w', 'an onion over http');
+const terms = { tag: 'withdrawRequest', callback: 'https://pay.example.com/cb', k1: 'k1k1', minWithdrawable: 1000, maxWithdrawable: 50000, defaultDescription: 'faucet' };
+assert.deepEqual(withdrawParamsOf(terms), { callback: 'https://pay.example.com/cb', k1: 'k1k1', minMsat: 1000, maxMsat: 50000, description: 'faucet', domain: 'pay.example.com' });
+assert.equal(withdrawParamsOf({ tag: 'payRequest', callback: 'x' }), null);
+assert.equal(withdrawParamsOf({ ...terms, maxWithdrawable: 0 }), null, 'nothing to withdraw is no withdraw');
+globalThis.fetch = async () => Response.json(terms);
+assert.deepEqual(await fetchWithdrawParams('https://pay.example.com/w'), withdrawParamsOf(terms));
+await assert.rejects(fetchPayParams('https://pay.example.com/w'), (e) => e.withdraw && e.withdraw.k1 === 'k1k1', 'a pay fetch that finds a withdraw says so');
+let cb = null;
+globalThis.fetch = async (url) => { const u = new URL(url); cb = { path: u.pathname, k1: u.searchParams.get('k1'), pr: u.searchParams.get('pr') }; return Response.json({ status: 'OK' }); };
+assert.equal(await submitWithdraw(withdrawParamsOf(terms), 'lnbc1invoice'), true);
+assert.deepEqual(cb, { path: '/cb', k1: 'k1k1', pr: 'lnbc1invoice' }, 'the callback gets k1 and the invoice');
+globalThis.fetch = async () => Response.json({ status: 'ERROR', reason: 'already claimed' });
+await assert.rejects(submitWithdraw(withdrawParamsOf(terms), 'lnbc1invoice'), /already claimed/);
+console.log('✓ lnurl-withdraw: lnurlw:// and lnurlp:// schemes, the terms, a pay fetch that finds a withdraw, the callback, the refusal');
diff --git a/tools/lnurl-withdraw-test.js b/tools/lnurl-withdraw-test.js
new file mode 100644
index 0000000..cc1b152
--- /dev/null
+++ b/tools/lnurl-withdraw-test.js
@@ -0,0 +1,103 @@
+// LNURL-withdraw: a site's withdraw lnurl pasted into Send is an offer to
+// PAY us — the wallet shows their range, makes an invoice for the amount
+// chosen, hands it to their callback and watches for the money. The Ark
+// side is faked (the invoice hook); the site is a stand-in on the test
+// server. Run: bun tools/lnurl-withdraw-test.js
+import assert from 'node:assert/strict';
+import puppeteer from './puppeteer.js';
+import { encodeLnurl } from '../src/lnurl.js';
+
+const app = await Bun.file('src/app.js').text();
+const domHelper = app.slice(app.indexOf('function h(tag,'), app.indexOf('// ---------------------------------------------------------------- morphing'));
+const entry = `
+import { zapsFeature } from './src/features/zaps.js';
+${domHelper}
+const ui = { screen: 'wallet', tab: 'send', send: { recipients: [{ address: '', amount: '' }] } };
+let watch = null, cancelled = [], invoices = 0;
+const wallet = { watchOnly: false, loadFeatureState: (k, d) => d, saveFeatureState: () => {} };
+const ctx = {
+  h, ui, wallet, render, toast: (m) => (window.toasts = (window.toasts || [])).push(m),
+  blankSend: () => ({ recipients: [{ address: '', amount: '' }] }),
+  fmtAmount: (n) => Number(n).toLocaleString('en-US'), unitLabel: () => 'sats', unitTag: () => h('span', { class: 'unit-tag' }, 'sats'),
+  parseAmount: (v) => { const n = Number(String(v).replace(/,/g, '')); return isFinite(n) ? Math.round(n) : null; }, getUnit: () => 'sats',
+  amountField: (sat) => String(sat),
+  hook(name, ...a) {
+    if (name === 'canLnPay') return true;
+    if (name === 'arkLnInvoice') { invoices++; return Promise.resolve({ id: 'ln' + invoices, invoice: 'lnbc' + a[0] + 'n1testinvoice' + invoices, amountSat: a[0] }); }
+    if (name === 'arkLnWatch') { watch = { id: a[0], cb: a[1] }; return true; }
+    if (name === 'arkLnUnwatch') { if (watch && watch.id === a[0]) watch = null; return true; }
+    if (name === 'arkLnCancel') { cancelled.push(a[0]); return Promise.resolve(true); }
+    return null;
+  },
+};
+const feature = zapsFeature(ctx); window.__feature = feature;
+function render() { document.querySelector('#app').replaceChildren(feature.sendView() || h('div', { id: 'closed' }, 'closed')); }
+window.test = { paste: (s) => feature.matchSendText(s, false), settle: (ok) => { const w = watch; watch = null; w.cb({ step: ok ? 'done' : 'failed' }); }, get watch() { return watch && watch.id; }, get cancelled() { return cancelled; }, ui };
+render();
+`;
+const bundle = await Bun.build({
+  entrypoints: ['lnw-test-entry'], target: 'browser',
+  plugins: [{ name: 'lnw-test', setup(build) {
+    build.onResolve({ filter: /^lnw-test-entry$/ }, () => ({ path: 'entry', namespace: 'lnw-test' }));
+    build.onLoad({ filter: /.*/, namespace: 'lnw-test' }, () => ({ contents: entry, loader: 'js', resolveDir: process.cwd() }));
+  } }],
+});
+assert(bundle.success, bundle.logs.join('\n'));
+const css = await Bun.file('src/style.css').text();
+const js = await bundle.outputs[0].text();
+const html = `<!doctype html><meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1"><style>${css}</style><div id="app"></div><script type="module">${js}</script>`;
+const claims = [];
+const server = Bun.serve({ port: 0, fetch: (req) => {
+  const u = new URL(req.url);
+  if (u.pathname === '/withdraw') return Response.json({ tag: 'withdrawRequest', callback: server.url.origin + '/cb', k1: 'deadbeef', minWithdrawable: 100000, maxWithdrawable: 5000000, defaultDescription: 'Faucet drip' });
+  if (u.pathname === '/withdraw-fixed') return Response.json({ tag: 'withdrawRequest', callback: server.url.origin + '/cb', k1: 'fixed1', minWithdrawable: 21000, maxWithdrawable: 21000 });
+  if (u.pathname === '/withdraw-spent') return Response.json({ tag: 'withdrawRequest', callback: server.url.origin + '/cb-spent', k1: 'spent', minWithdrawable: 1000, maxWithdrawable: 1000 });
+  if (u.pathname === '/cb') { claims.push({ k1: u.searchParams.get('k1'), pr: u.searchParams.get('pr') }); return Response.json({ status: 'OK' }); }
+  if (u.pathname === '/cb-spent') return Response.json({ status: 'ERROR', reason: 'this voucher was already used' });
+  return new Response(html, { headers: { 'content-type': 'text/html' } });
+} });
+const lnurl = (path) => encodeLnurl(server.url.origin + path);
+const browser = await puppeteer.launch({ executablePath: '/usr/bin/google-chrome', headless: true, args: ['--no-sandbox'] });
+const page = await browser.newPage();
+const errors = [];
+page.on('pageerror', (e) => errors.push(e.message));
+const pause = (ms) => new Promise((r) => setTimeout(r, ms));
+const check = (name, value, detail = '') => { assert(value, name + (detail ? ' — ' + detail : '')); console.log(' ✓ ' + name); };
+const text = () => page.evaluate(() => document.body.innerText.replace(/\s+/g, ' '));
+const waitText = async (re, ms = 5000) => { for (let i = 0; i < ms / 100; i++) { if (re.test(await text())) return true; await pause(100); } return false; };
+const click = (label) => page.evaluate((x) => { const b = [...document.querySelectorAll('button')].find((n) => n.textContent.trim() === x || n.textContent.trim().endsWith(' ' + x)); if (!b) return false; b.click(); return true; }, label);
+const type = (sel, v) => page.evaluate(([s, val]) => { const i = document.querySelector(s); i.value = val; i.dispatchEvent(new Event('input', { bubbles: true })); }, [sel, v]);
+const host = new URL(server.url.origin).hostname;
+try {
+  await page.setViewport({ width: 390, height: 844 });
+  await page.goto(server.url.href);
+  await page.waitForSelector('#closed');
+  console.log('[a withdraw lnurl with a range]');
+  check('the paste is claimed', await page.evaluate((s) => test.paste(s), lnurl('/withdraw')));
+  check('their terms show: the site, the range, the description', await waitText(/Withdraw over Lightning/) && new RegExp(host + ' will pay you between 100 and 5,000 sats').test(await text()) && /Faucet drip/.test(await text()), await text());
+  check('the amount starts at their max', await page.$eval('input[type=number]', (i) => i.value) === '5000');
+  await type('input[type=number]', '9000'); await click('Withdraw'); await pause(100);
+  check('over their max: told the range, nothing sent', /Between 100 and 5,000 sats/.test(await text()) && claims.length === 0);
+  await type('input[type=number]', '1500'); await click('Withdraw');
+  check('an invoice for the amount is handed to their callback', await waitText(new RegExp(host + ' has your invoice for 1,500 sats')) && claims.length === 1 && claims[0].k1 === 'deadbeef' && claims[0].pr === 'lnbc1500n1testinvoice1', JSON.stringify(claims));
+  check('…and the wallet watches for the money', (await page.evaluate(() => test.watch)) === 'ln1');
+  await page.evaluate(() => test.settle(true));
+  check('paid: Received', await waitText(/Received 1,500 sats/) && !!(await page.$('.check-badge')));
+  await click('Done'); await pause(50);
+  check('Done closes it', !!(await page.$('#closed')));
+
+  console.log('[a fixed amount]');
+  await page.evaluate((s) => test.paste(s), lnurl('/withdraw-fixed'));
+  check('a fixed amount is stated, with no field', await waitText(new RegExp(host + ' will pay you 21 sats')) && !(await page.$('input[type=number]')));
+  await click('Withdraw');
+  check('withdrawn at that amount', await waitText(/has your invoice for 21 sats/) && claims[1].pr === 'lnbc21n1testinvoice2', JSON.stringify(claims));
+  await click('Back'); await pause(50);
+  check('Back before it is paid stops watching', (await page.evaluate(() => test.watch)) === null && !!(await page.$('#closed')));
+
+  console.log('[a site that refuses]');
+  await page.evaluate((s) => test.paste(s), lnurl('/withdraw-spent'));
+  await waitText(/will pay you 1 sats/); await click('Withdraw');
+  check("their reason is shown, with Try again", await waitText(/already used/) && /Try again/.test(await text()), await text());
+  check('no page errors', errors.length === 0, errors.join('; '));
+  console.log('\n✅ a withdraw lnurl pays us');
+} catch (e) { console.error('\n❌', e.message); process.exitCode = 1; } finally { await browser.close(); server.stop(true); }
diff --git a/tools/pager-gone-picture-test.js b/tools/pager-gone-picture-test.js
new file mode 100644
index 0000000..683493b
--- /dev/null
+++ b/tools/pager-gone-picture-test.js
@@ -0,0 +1,77 @@
+// A picture whose host is down (its server answers 502, so neither a copy
+// nor the original can load) shows a plain "couldn't be loaded" slide with
+// the host's name, not the browser's broken-picture glyph in a corner
+// (Adam's screenshot, 2026-10-16: isolabellart's relay down). The slides
+// around it are untouched. Run: bun tools/pager-gone-picture-test.js
+import puppeteer from './puppeteer.js';
+import { cacheKeyFor } from '../src/wallet.js';
+import { generateSecretKey, getPublicKey, finalizeEvent } from 'nostr-tools/pure';
+import { buildHtml } from '../build.js';
+const sleep = (ms) => new Promise((r) => setTimeout(r, ms));
+let ok = true;
+const check = (n, c, d = '') => { console.log(` ${c ? '✓' : '✗'} ${n}${d ? ' — ' + d : ''}`); if (!c) ok = false; };
+const png = (size) => Bun.spawnSync(['ffmpeg', '-loglevel', 'error', '-f', 'lavfi', '-i', 'testsrc=size=' + size, '-frames:v', '1', '-f', 'image2', '-c:v', 'png', 'pipe:1']).stdout;
+const PICS = { big1: png('2400x1800'), big3: png('2000x2000') };
+const SK = generateSecretKey(), AUTHOR = getPublicKey(SK);
+const now = Math.floor(Date.now() / 1000);
+const post = (content, ago) => finalizeEvent({ kind: 1, created_at: now - ago, tags: [], content }, SK);
+const html = await buildHtml({ minify: true, pwa: false });
+const hits = [];
+const server = Bun.serve({ port: 0, fetch: (req) => {
+  const path = new URL(req.url).pathname;
+  if (path.startsWith('/punks')) return new Response(Bun.file('dist' + path));
+  if (path === '/big2.png') { hits.push('big2'); return new Response('Bad Gateway', { status: 502 }); } // the host is down
+  const m = /^\/(big\d)\.png$/.exec(path);
+  if (m) { hits.push(m[1]); return new Response(PICS[m[1]], { headers: { 'content-type': 'image/png', 'access-control-allow-origin': '*' } }); }
+  return new Response(html, { headers: { 'content-type': 'text/html' } });
+} });
+const U = (n) => server.url.origin + '/' + n + '.png';
+const seeded = [post('first big ' + U('big1'), 100), post('second big ' + U('big2'), 200), post('third big ' + U('big3'), 300),
+  ...Array.from({ length: 10 }, (_, i) => post('filler ' + i + ' ' + 'lorem ipsum dolor sit amet. '.repeat(5), 500 + i * 60))];
+const browser = await puppeteer.launch({ executablePath: '/usr/bin/google-chrome', headless: 'new', args: ['--no-sandbox'] });
+const page = await browser.newPage();
+const errs = [];
+page.on('pageerror', (e) => errs.push(String(e)));
+const click = (t) => page.evaluate((x) => { const e = [...document.querySelectorAll('button')].find((n) => n.textContent.trim().toLowerCase().includes(x)); if (e) { e.click(); return true; } return false; }, t);
+const waitText = async (x, ms = 25000) => { for (let i = 0; i < ms / 250; i++) { if ((await page.evaluate(() => document.body.innerText)).toLowerCase().includes(x)) return true; await sleep(250); } return false; };
+const waitFor = async (fn, arg, ms = 10000) => { for (let i = 0; i < ms / 100; i++) { if (await page.evaluate(fn, arg)) return true; await sleep(100); } return false; };
+const slides = () => page.evaluate(() => [...document.querySelectorAll('.mp-slide')].map((s) => { const i = s.querySelector('img.mp-media'); const r = s.getBoundingClientRect(); return { k: s.getAttribute('data-k').split('/').pop(), src: (i.getAttribute('src') || '').replace(/^blob:.*/, 'blob:'), cur: s.classList.contains('mp-cur'), willChange: getComputedStyle(i).willChange, on: Math.abs(r.top) < 4 }; }));
+try {
+  await page.setViewport({ width: 390, height: 844 });
+  await page.goto(server.url.href, { waitUntil: 'domcontentloaded' });
+  await page.evaluate(() => localStorage.setItem('btc-wallet-network', 'regtest'));
+  await page.reload({ waitUntil: 'domcontentloaded' });
+  await sleep(400);
+  await click('create a new wallet'); await sleep(600);
+  await page.waitForSelector('.words .w .t');
+  const mn = (await page.$$eval('.words .w .t', (l) => l.map((e) => e.textContent.trim()))).join(' ');
+  await click('skip verification');
+  await waitText('receive', 20000);
+  const base = cacheKeyFor(mn + '\n');
+  await page.evaluate(([k, pk, ns]) => {
+    localStorage.setItem(k + ':follows', JSON.stringify({ tags: [['p', pk]], c: '', at: Math.floor(Date.now() / 1000) }));
+    localStorage.setItem(k + ':feedNotes', JSON.stringify(ns));
+    localStorage.setItem(k + ':profiles', JSON.stringify({ [pk]: { name: 'Picture Poster', t: Date.now() } }));
+    localStorage.setItem('btc-wallet-feed:' + k, 'following');
+  }, [base, AUTHOR, seeded]);
+  await page.reload({ waitUntil: 'domcontentloaded' });
+  await waitText('receive', 20000);
+  await page.evaluate(() => document.querySelector('.app-nav-button[aria-label="Feed"]').click());
+  check('the feed paints its copies of the pictures', await waitFor(() => [...document.querySelectorAll('.notes-feed img.note-img')].filter((i) => i.getAttribute('src').startsWith('blob:')).length >= 2, null, 25000));
+  const at = await page.evaluate(() => { const r = [...document.querySelectorAll('.notes-feed [data-key]')].find((n) => n.textContent.includes('first big')); r.scrollIntoView({ block: 'center' }); const i = r.querySelector('img.note-img').getBoundingClientRect(); return { x: i.x + i.width / 2, y: i.y + i.height / 2 }; });
+  await sleep(300);
+  await page.mouse.click(at.x, at.y);
+  check('the picture opens in the pager', await waitFor(() => !!document.querySelector('.media-pager .mp-slide img.mp-media'), null, 4000));
+  check('the picture that loads is sharpened at rest', await waitFor(() => { const c = document.querySelector('.mp-slide.mp-cur img.mp-media'); return c && c.getAttribute('src').endsWith('/big1.png'); }, null, 5000));
+  await page.keyboard.press('ArrowDown');
+  check('down: the dead picture\'s slide', await waitFor(() => { const c = document.querySelector('.mp-slide.mp-cur'); return c && c.getAttribute('data-k').endsWith('/big2.png'); }, null, 4000));
+  check('it says the picture couldn\'t be loaded, naming the host', await waitFor(() => { const c = document.querySelector('.mp-slide.mp-cur'); return c.classList.contains('mp-gone') && /couldn’t be loaded/.test(c.textContent) && /localhost/.test(c.querySelector('.mp-missing')?.textContent || ''); }, null, 6000), await page.evaluate(() => document.querySelector('.mp-slide.mp-cur').outerHTML.slice(0, 300)));
+  check('…and the broken <img> is hidden', await page.evaluate(() => getComputedStyle(document.querySelector('.mp-slide.mp-cur img.mp-media')).display === 'none'));
+  check('the original was tried after the copy failed', await page.evaluate(() => document.querySelector('.mp-slide.mp-cur img.mp-media').getAttribute('src').endsWith('/big2.png')));
+  await page.keyboard.press('ArrowDown');
+  check('the next slide is fine', await waitFor(() => { const c = document.querySelector('.mp-slide.mp-cur'); return c && c.getAttribute('data-k').endsWith('/big3.png') && !c.classList.contains('mp-gone'); }, null, 4000) && await waitFor(() => document.querySelector('.mp-slide.mp-cur img.mp-media').getAttribute('src').endsWith('/big3.png'), null, 5000));
+  check('its caption and controls are still there on the dead one', await page.evaluate(() => { const g = [...document.querySelectorAll('.mp-slide')].find((x) => x.getAttribute('data-k').endsWith('/big2.png')); return !!g.querySelector('.mp-like') && /second big/.test(g.textContent); }));
+  check('no page errors', errs.length === 0, errs.slice(0, 2).join(' | '));
+} catch (e) { console.error(e); ok = false; } finally { await browser.close(); server.stop(true); }
+console.log(ok ? '\n✅ a dead picture says so' : '\n❌ failed');
+process.exit(ok ? 0 : 1);
diff --git a/tools/pager-sharpen-test.js b/tools/pager-sharpen-test.js
new file mode 100644
index 0000000..ea5c878
--- /dev/null
+++ b/tools/pager-sharpen-test.js
@@ -0,0 +1,78 @@
+// A picture in the media pager flies in as the feed's column copy (the one
+// the feed already decoded) and is sharpened to the original once its slide
+// comes to rest; only the slide at rest carries the zoom layer. (Originals
+// decoded and uploaded as they passed made a flight stutter — Adam,
+// 2026-10-16.) Run: bun tools/pager-sharpen-test.js
+import puppeteer from './puppeteer.js';
+import { cacheKeyFor } from '../src/wallet.js';
+import { generateSecretKey, getPublicKey, finalizeEvent } from 'nostr-tools/pure';
+import { buildHtml } from '../build.js';
+const sleep = (ms) => new Promise((r) => setTimeout(r, ms));
+let ok = true;
+const check = (n, c, d = '') => { console.log(` ${c ? '✓' : '✗'} ${n}${d ? ' — ' + d : ''}`); if (!c) ok = false; };
+const png = (size) => Bun.spawnSync(['ffmpeg', '-loglevel', 'error', '-f', 'lavfi', '-i', 'testsrc=size=' + size, '-frames:v', '1', '-f', 'image2', '-c:v', 'png', 'pipe:1']).stdout;
+const PICS = { big1: png('2400x1800'), big2: png('1800x2400'), big3: png('2000x2000') };
+const SK = generateSecretKey(), AUTHOR = getPublicKey(SK);
+const now = Math.floor(Date.now() / 1000);
+const post = (content, ago) => finalizeEvent({ kind: 1, created_at: now - ago, tags: [], content }, SK);
+const html = await buildHtml({ minify: true, pwa: false });
+const hits = [];
+const server = Bun.serve({ port: 0, fetch: (req) => {
+  const path = new URL(req.url).pathname;
+  if (path.startsWith('/punks')) return new Response(Bun.file('dist' + path));
+  const m = /^\/(big\d)\.png$/.exec(path);
+  if (m) { hits.push(m[1]); return new Response(PICS[m[1]], { headers: { 'content-type': 'image/png', 'access-control-allow-origin': '*' } }); }
+  return new Response(html, { headers: { 'content-type': 'text/html' } });
+} });
+const U = (n) => server.url.origin + '/' + n + '.png';
+const seeded = [post('first big ' + U('big1'), 100), post('second big ' + U('big2'), 200), post('third big ' + U('big3'), 300),
+  ...Array.from({ length: 10 }, (_, i) => post('filler ' + i + ' ' + 'lorem ipsum dolor sit amet. '.repeat(5), 500 + i * 60))];
+const browser = await puppeteer.launch({ executablePath: '/usr/bin/google-chrome', headless: 'new', args: ['--no-sandbox'] });
+const page = await browser.newPage();
+const errs = [];
+page.on('pageerror', (e) => errs.push(String(e)));
+const click = (t) => page.evaluate((x) => { const e = [...document.querySelectorAll('button')].find((n) => n.textContent.trim().toLowerCase().includes(x)); if (e) { e.click(); return true; } return false; }, t);
+const waitText = async (x, ms = 25000) => { for (let i = 0; i < ms / 250; i++) { if ((await page.evaluate(() => document.body.innerText)).toLowerCase().includes(x)) return true; await sleep(250); } return false; };
+const waitFor = async (fn, arg, ms = 10000) => { for (let i = 0; i < ms / 100; i++) { if (await page.evaluate(fn, arg)) return true; await sleep(100); } return false; };
+const slides = () => page.evaluate(() => [...document.querySelectorAll('.mp-slide')].map((s) => { const i = s.querySelector('img.mp-media'); const r = s.getBoundingClientRect(); return { k: s.getAttribute('data-k').split('/').pop(), src: (i.getAttribute('src') || '').replace(/^blob:.*/, 'blob:'), cur: s.classList.contains('mp-cur'), willChange: getComputedStyle(i).willChange, on: Math.abs(r.top) < 4 }; }));
+try {
+  await page.setViewport({ width: 390, height: 844 });
+  await page.goto(server.url.href, { waitUntil: 'domcontentloaded' });
+  await page.evaluate(() => localStorage.setItem('btc-wallet-network', 'regtest'));
+  await page.reload({ waitUntil: 'domcontentloaded' });
+  await sleep(400);
+  await click('create a new wallet'); await sleep(600);
+  await page.waitForSelector('.words .w .t');
+  const mn = (await page.$$eval('.words .w .t', (l) => l.map((e) => e.textContent.trim()))).join(' ');
+  await click('skip verification');
+  await waitText('receive', 20000);
+  const base = cacheKeyFor(mn + '\n');
+  await page.evaluate(([k, pk, ns]) => {
+    localStorage.setItem(k + ':follows', JSON.stringify({ tags: [['p', pk]], c: '', at: Math.floor(Date.now() / 1000) }));
+    localStorage.setItem(k + ':feedNotes', JSON.stringify(ns));
+    localStorage.setItem(k + ':profiles', JSON.stringify({ [pk]: { name: 'Picture Poster', t: Date.now() } }));
+    localStorage.setItem('btc-wallet-feed:' + k, 'following');
+  }, [base, AUTHOR, seeded]);
+  await page.reload({ waitUntil: 'domcontentloaded' });
+  await waitText('receive', 20000);
+  await page.evaluate(() => document.querySelector('.app-nav-button[aria-label="Feed"]').click());
+  check('the feed paints its copies of the pictures', await waitFor(() => [...document.querySelectorAll('.notes-feed img.note-img')].filter((i) => i.getAttribute('src').startsWith('blob:')).length >= 2, null, 25000));
+  const at = await page.evaluate(() => { const r = [...document.querySelectorAll('.notes-feed [data-key]')].find((n) => n.textContent.includes('first big')); r.scrollIntoView({ block: 'center' }); const i = r.querySelector('img.note-img').getBoundingClientRect(); return { x: i.x + i.width / 2, y: i.y + i.height / 2 }; });
+  await sleep(300);
+  await page.mouse.click(at.x, at.y);
+  check('the picture opens in the pager', await waitFor(() => !!document.querySelector('.media-pager .mp-slide img.mp-media'), null, 4000));
+  let s = await slides();
+  check('every slide carries the copy, not the original', s.length >= 3 && s.every((x) => x.src === 'blob:' || x.src === ''), JSON.stringify(s.map((x) => x.src)));
+  check('the slide on screen is the current one, alone with the zoom layer', s.filter((x) => x.cur).length === 1 && s.find((x) => x.cur).on && s.every((x) => (x.willChange === 'transform') === x.cur), JSON.stringify(s.map((x) => [x.cur, x.willChange])));
+  check('…sharpened to the original once at rest', await waitFor(() => { const c = document.querySelector('.mp-slide.mp-cur img.mp-media'); return c && c.getAttribute('src').endsWith('/big1.png'); }, null, 5000), JSON.stringify((await slides()).map((x) => x.src)));
+  s = await slides();
+  check('the others stay on their copies', s.filter((x) => !x.cur).every((x) => x.src === 'blob:' || x.src === ''), JSON.stringify(s.map((x) => x.src)));
+  await page.keyboard.press('ArrowDown');
+  check('down: the next slide becomes current', await waitFor(() => { const c = document.querySelector('.mp-slide.mp-cur'); return c && c.getAttribute('data-k').endsWith('/big2.png'); }, null, 4000));
+  check('…and is sharpened in its turn', await waitFor(() => { const c = document.querySelector('.mp-slide.mp-cur img.mp-media'); return c && c.getAttribute('src').endsWith('/big2.png'); }, null, 5000), JSON.stringify((await slides()).map((x) => x.src)));
+  s = await slides();
+  check('only one slide has the zoom layer', s.filter((x) => x.willChange === 'transform').length === 1 && s.find((x) => x.willChange === 'transform').k === 'big2.png');
+  check('no page errors', errs.length === 0, errs.slice(0, 2).join(' | '));
+} catch (e) { console.error(e); ok = false; } finally { await browser.close(); server.stop(true); }
+console.log(ok ? '\n✅ pager slides fly as copies and sharpen at rest' : '\n❌ failed');
+process.exit(ok ? 0 : 1);