Downloads with the same suggested filename silently overwrite each other in the output dir #514

Downloads are saved to <outputDir>/<suggestedFilename>. Unlike screenshots, snapshots and storage-state files, which get timestamped names, a second download with the same suggested name replaces the first. Both responses report the same path, so the first file is lost without any warning. Sites commonly reuse names such as invoice.pdf, export.csv or report.xlsx.

Steps to reproduce

<!-- dl.html -->
<a href="data:text/plain,v1" download="same.txt">V1</a>
<a href="data:text/plain,v2" download="same.txt">V2</a>

playwright-cli open http://127.0.0.1:8765/dl.html
playwright-cli click 'text=V1'   # Downloaded file same.txt to ".playwright-cli/same.txt"
playwright-cli click 'text=V2'   # Downloaded file same.txt to ".playwright-cli/same.txt"
cat .playwright-cli/same.txt     # v2

Expected

The second download gets a unique name (for example same-1.txt, the way video files get a -1 suffix), and the event reports that path.

Environment

• @playwright/cli 0.1.23 (main @ f50f579), playwright-core 1.65.0-alpha-2026-10-30
• Node 22.23.4, Linux x64, Chrome for Testing 153