chore: satisfy prettier in frontend and e2e

`checks.yml` runs `npm run format:check` for both projects and both were failing.

- frontend/src/lib/ui-store.ts is mine, unformatted since the round-1 upload-queue
  badge fix — the same miss as the rustfmt one: I gated on svelte-check and eslint
  but never on format:check.
- e2e/loadtest/* and e2e/shots.mjs have been unformatted since 7758270 and are
  unrelated to the audit work. Fixed here because they block the same gate and the
  fix is mechanical; no behaviour change in either project.

Still red and deliberately NOT fixed here: `npm run lint` in the frontend reports
`svelte/prefer-svelte-reactivity` on routes/diashow/+page.svelte:208 (a mutable
`Set` where the rule wants `SvelteSet`), pre-existing since 5009590. That one is a
real reactivity change in code I have no test coverage for, so it belongs in its
own change rather than smuggled into a formatting commit.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

e2e/loadtest/driver.mjs

@@ -132,9 +132,19 @@ const truncate = (adminJwt) =>
   api('/admin/__truncate', { method: 'POST', token: adminJwt, expect: [204] });
 
 const CAPTIONS = [
-  'Was für ein magischer Tag 💍', 'Der erste Tanz 🕺', 'Prost! 🥂', 'Die Torte 🍰',
-  'Feuerwerk 🎆', 'Beste Freunde 💕', 'Was für eine Stimmung! 🎉', 'Details 🌸',
-  'Sonnenuntergang 🌅', 'Tanzfläche brennt 🔥', null, null, null,
+  'Was für ein magischer Tag 💍',
+  'Der erste Tanz 🕺',
+  'Prost! 🥂',
+  'Die Torte 🍰',
+  'Feuerwerk 🎆',
+  'Beste Freunde 💕',
+  'Was für eine Stimmung! 🎉',
+  'Details 🌸',
+  'Sonnenuntergang 🌅',
+  'Tanzfläche brennt 🔥',
+  null,
+  null,
+  null,
 ];
 const TAGS = ['hochzeit', 'liebe', 'party', 'tanzen', 'natur', 'feier', 'freunde', 'dessert'];
 
@@ -238,9 +248,12 @@ async function sampleResources() {
   const out = { ts: now() };
   try {
     const { stdout } = await execFileAsync('docker', [
-      'stats', '--no-stream', '--format',
+      'stats',
+      '--no-stream',
+      '--format',
       '{{.Name}}|{{.CPUPerc}}|{{.MemUsage}}',
-      cfg.appContainer, cfg.dbContainer,
+      cfg.appContainer,
+      cfg.dbContainer,
     ]);
     out.docker = stdout.trim();
   } catch (e) {
@@ -259,8 +272,15 @@ async function sampleResources() {
 
 function psql(sql) {
   return execFileAsync('docker', [
-    'exec', cfg.dbContainer, 'psql', '-U', 'eventsnap_test', '-d', 'eventsnap_test',
-    '-tAc', sql,
+    'exec',
+    cfg.dbContainer,
+    'psql',
+    '-U',
+    'eventsnap_test',
+    '-d',
+    'eventsnap_test',
+    '-tAc',
+    sql,
   ]);
 }
 
@@ -292,8 +312,13 @@ function summarize(nums) {
   const s = [...nums].sort((a, b) => a - b);
   const sum = s.reduce((a, b) => a + b, 0);
   return {
-    n: s.length, min: s[0], max: s[s.length - 1], mean: Math.round(sum / s.length),
-    p50: pct(s, 50), p95: pct(s, 95), p99: pct(s, 99),
+    n: s.length,
+    min: s[0],
+    max: s[s.length - 1],
+    mean: Math.round(sum / s.length),
+    p50: pct(s, 50),
+    p95: pct(s, 95),
+    p99: pct(s, 99),
   };
 }
 
@@ -490,7 +515,9 @@ async function main() {
   await sleep(cfg.windowSec * 1000 + 500);
   await Promise.all(burstPromises);
   clearInterval(ticker);
-  console.log(`[run] all bursts issued. uploaded ${done}, ok ${uploads.filter((u) => u.status === 201).length}`);
+  console.log(
+    `[run] all bursts issued. uploaded ${done}, ok ${uploads.filter((u) => u.status === 201).length}`
+  );
 
   // Drain: wait for compression backlog to clear (SSE processed ⊇ successful ids)
   console.log('[drain] waiting for compression backlog to clear…');
@@ -589,21 +616,28 @@ async function main() {
   console.log('\n' + '━'.repeat(72));
   console.log('RESULTS');
   console.log('━'.repeat(72));
-  console.log(`uploads: ${okUploads.length}/${uploads.length} ok — byStatus ${JSON.stringify(byStatus)}`);
+  console.log(
+    `uploads: ${okUploads.length}/${uploads.length} ok — byStatus ${JSON.stringify(byStatus)}`
+  );
   console.log(`upload latency ms: ${JSON.stringify(uploadLatency)}`);
   console.log(`pipeline latency ms (upload→preview ready): ${JSON.stringify(pipelineLatency)}`);
   console.log(`backlog drain: ${(drainMs / 1000).toFixed(1)}s, cleared=${report.drain.cleared}`);
   console.log(`final db compression status: ${JSON.stringify(finalCounts)}`);
-  console.log(`sse: ${sseClients.length} conns, ${totalReconnects} reconnects, ${totalResyncs} resyncs`);
+  console.log(
+    `sse: ${sseClients.length} conns, ${totalReconnects} reconnects, ${totalResyncs} resyncs`
+  );
   console.log(`\nfull report → ${outPath}`);
 
   // Heuristic pass/fail flags (validate shipping config)
   const flags = [];
-  const err5xx = Object.entries(byStatus).filter(([s]) => +s >= 500).reduce((a, [, n]) => a + n, 0);
+  const err5xx = Object.entries(byStatus)
+    .filter(([s]) => +s >= 500)
+    .reduce((a, [, n]) => a + n, 0);
   if (err5xx > 0) flags.push(`✗ ${err5xx} server errors (5xx)`);
   if (byStatus['507']) flags.push(`✗ ${byStatus['507']} quota rejections (507)`);
   if (byStatus['413']) flags.push(`⚠ ${byStatus['413']} too-large (413)`);
-  if (byStatus['429']) flags.push(`⚠ ${byStatus['429']} rate-limited (429) — unexpected with limits off`);
+  if (byStatus['429'])
+    flags.push(`⚠ ${byStatus['429']} rate-limited (429) — unexpected with limits off`);
   if (!report.drain.cleared) flags.push(`✗ backlog did NOT drain within ${cfg.drainTimeoutSec}s`);
   if (totalResyncs > sseClients.length) flags.push(`⚠ ${totalResyncs} SSE resyncs (consumer lag)`);
   if (pipelineLatency && pipelineLatency.p95 > 60000)