test(filechooser): allow exact one second lastModified rounding

[dcrousso]

WebKit can round a millisecond timestamp down by exactly one second

for example, https://github.com/microsoft/playwright-browsers/actions/runs/31034589073/job/92422156152

[github-actions]

Test results for "tests 1"

8 flaky

⚠️ [chromium-library] › library/beforeunload.spec.ts:130 › should support dismissing the dialog multiple times `@chromium-ubuntu-22.04-arm-node20`
⚠️ [chromium-library] › library/video.spec.ts:699 › screencast › should capture full viewport on hidpi `@chromium-ubuntu-22.04-arm-node20`
⚠️ [chromium-library] › library/chromium/chromium.spec.ts:211 › should intercept service worker requests (main and within) `@realtime-time-library-chromium-linux`
⚠️ [chromium-library] › library/video.spec.ts:495 › screencast › should capture static page in persistent context @smoke `@realtime-time-library-chromium-linux`
⚠️ [firefox-library] › library/browsertype-connect.spec.ts:807 › run-server › should upload a folder `@firefox-ubuntu-22.04-node20`
⚠️ [firefox-library] › library/heap.spec.ts:223 › should not leak workers `@firefox-ubuntu-22.04-node20`
⚠️ [firefox-page] › page/page-event-request.spec.ts:181 › should return response body when Cross-Origin-Opener-Policy is set `@firefox-ubuntu-22.04-node20`
⚠️ [webkit-library] › library/browsertype-connect.spec.ts:714 › run-server › should record trace with sources `@webkit-ubuntu-22.04-node20`

51229 passed, 1190 skipped

---

Merge workflow run.

[github-actions]

Test results for "MCP"

2 failed
❌ [firefox] › mcp/cli-core.spec.ts:77 › click with --modifiers @mcp-windows-latest-firefox
❌ [firefox] › mcp/cli-devtools.spec.ts:84 › request shows full request and response details @mcp-windows-latest-firefox

8048 passed, 1284 skipped

---

Merge workflow run.

[github-actions]

🟢 CI is clear — both failures are pre-existing flakes

Hi, I'm the Playwright bot and I took a first look at the failing CI here.

This PR is test-only (relaxing the lastModified rounding assertion from < 1000 to <= 1000 in three filechooser specs). The two failures are both Firefox MCP tests on Windows that have nothing to do with that diff, and both fail on unrelated SHAs, so I'm calling this green.

Details

Overall: The "tests 1" report has no failures — 8 flaky, nothing to triage. The MCP report has 2 failed, both on mcp-windows-latest-firefox, both proven pre-existing flakes. Nothing the diff touches (the setInputFiles lastModified assertion) is exercised by these MCP click/request tests.

Pre-existing flake / infra

• [firefox] › mcp/cli-core.spec.ts:77 › click with --modifiers — flaked on this bot outside this PR. Across the results DB it's failed 1 of 654 Firefox runs, and that other failure is on PR fix(mcp): validate Host and Origin on CDP relay WebSocket upgrades #42103 (sha 3d7e075e), same mcp-windows-latest-firefox bot. Unrelated to a filechooser test change.
• [firefox] › mcp/cli-devtools.spec.ts:84 › request shows full request and response details — flaked repeatedly elsewhere. Failed 3 of 654 Firefox runs (plus once on msedge), on a main push (sha 4b0cc996) and on PRs feat(chromium): roll to r1236 #42038 and Revert "feat(routeFromHar): add interceptAPIRequests option (#41294)" #41964 — all on mcp-windows-latest-firefox, none related to this PR.

Both are Firefox-only, Windows-only sporadic failures on code this PR doesn't touch.

_{Triaged by the Playwright bot - agent run}