chore: upgrade React experimental to 0.0.0-experimental-404b38c7-20260408

[react-server-bot]

Automated daily upgrade of React packages to the latest experimental version.

Previous version: 0.0.0-experimental-1b45e243-20260402
New version: 0.0.0-experimental-404b38c7-20260408

Updated locations

• packages/react-server/package.json — react, react-dom, react-is, react-server-dom-webpack
• package.json — all pnpm.overrides for React
• docs/ — micro-frontends MDX (en + ja) esm.sh URLs
• pnpm-lock.yaml

Smoke test

• Dev mode — hello world test passed ✅
• Build+start mode — hello world test passed ✅

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Status	Name	Latest Commit	Updated (UTC)
✅ Deployment successful! View logs	react-server-docs	f249668	Apr 09 2026, 06:36 AM

[github-actions]

⚡ Benchmark Results

	PR f249668	main 249497a
Config	50 connections, 10s/test	50 connections, 10s/test

Benchmark	Req/s	vs main	Avg Latency	vs main	P99 Latency	Throughput
minimal	488	🟢 +2.6%	101.3 ms	🟢 -2.8%	165 ms	2.4 MB/s
small	496	⚪ -0.9%	99.67 ms	🔴 +1.1%	143 ms	3.0 MB/s
medium	220	🟢 +4.2%	223.64 ms	🟢 -3.5%	346 ms	9.8 MB/s
large	28	🟢 +16.1%	1687.27 ms	🟢 -7.6%	3465 ms	9.6 MB/s
deep	385	🟢 +3.3%	128.91 ms	🟢 -3.1%	183 ms	5.6 MB/s
wide	36	🟢 +15.8%	1305.86 ms	🟢 -7.6%	2471 ms	7.9 MB/s
cached	3299	🟢 +4.5%	14.64 ms	🟢 -4.6%	30 ms	146.4 MB/s
client-min	554	🔴 -3.8%	89.34 ms	🔴 +3.6%	137 ms	2.6 MB/s
client-small	564	⚪ -0.7%	87.72 ms	⚪ +0.3%	128 ms	2.8 MB/s
client-med	407	🔴 -2.5%	121.84 ms	🔴 +2.4%	161 ms	7.6 MB/s
client-large	95	🟢 +8.7%	513.2 ms	🟢 -7.7%	911 ms	9.9 MB/s
client-deep	507	🔴 -2.9%	97.78 ms	🔴 +2.6%	129 ms	3.8 MB/s
client-wide	162	🟢 +17.0%	305.71 ms	🟢 -12.8%	542 ms	9.5 MB/s
static-json	9528	🔴 -12.7%	4.85 ms	🔴 +24.0%	14 ms	4.0 MB/s
static-js	9832	🔴 -10.5%	4.68 ms	🔴 +20.0%	14 ms	11.7 MB/s
404-miss	6480	🟢 +6.9%	7.34 ms	🟢 -3.8%	15 ms	0.8 MB/s

Legend

🟢 > 1% improvement | 🔴 > 1% regression | ⚪ within noise margin

Benchmarks run on GitHub Actions runners (shared infrastructure) — expect ~5% variance between runs. Consistent directional changes across multiple routes are more meaningful than any single number.

[codecov-commenter]

❌ 1 Tests Failed:

Tests completed	Failed	Passed	Skipped
903	1	902	12

View the top 2 failed test(s) by shortest run time

__test__/apps/typed-router.spec.mjs > typed-router — resource data across navigations > navigating between user pages updates resource data

Stack Traces | 1.02s run time

AssertionError: expected 'Name: Charlie Brown' to contain 'Diana Prince'

Expected: "Diana Prince"
Received: "Name: Charlie Brown"

 ❯ __test__/apps/typed-router.spec.mjs:710:65

__test__/apps/mantine.spec.mjs > __test__/apps/mantine.spec.mjs

Stack Traces | 240s run time

Error: Hook timed out in 240000ms.
If this is a long-running hook, pass a timeout value as the last argument or configure it globally with "hookTimeout".
 ❯ __test__/apps/mantine.spec.mjs:13:10

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