docs: troubleshooting now references Chrome (not Chromium), add Windows kill cmd

[chewinggum604-art]

Summary

scripts/setup_environment.py installs Chrome (not Chromium) — see
the python -m patchright install chrome call. The reasoning is in the
inline comment: real Chrome ensures cross-platform reliability and
consistent fingerprinting.

But references/troubleshooting.md still calls it "Chromium" everywhere,
and the kill-process snippet only covers Linux/macOS (pkill -f chromium),
leaving Windows users with no equivalent.

This PR:

• Replaces every occurrence of chromium / Chromium in the
  troubleshooting guide with chrome / Chrome.
• Adds the Windows equivalent (taskkill /F /IM chrome.exe) alongside
  the Linux/macOS pkill -f chrome line.

Diff

 references/troubleshooting.md | 16 +++++++++-------
 1 file changed, 9 insertions(+), 7 deletions(-)

Doc-only change.