chore(e2e): untrack + gitignore Playwright test-results artifacts

These were accidentally committed (tracked on main); they are regenerated on
every run and shouldn't be in git.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

.gitignore

@@ -30,3 +30,7 @@ simulator/static/review_audio.html
 # Static build outputs (tools/build_static.py)
 /dist/
 /dist-media/
+
+# Playwright e2e artifacts (should never be committed)
+simulator/e2e/test-results/
+simulator/e2e/playwright-report/