Thanks for the regression fix for #1360.

Cross-checked against current static/ui.js and static/style.css:

• The dead-zone widening is a real change — static/ui.js line ~836 currently uses scrollHeight - scrollTop - clientHeight < 150, so bumping the re-pin threshold to 250px is a single-site edit on the right code path.
• overscroll-anchor: none does not appear anywhere in static/style.css today, so adding it on the transcript scroller is net-new (not a duplicate or override of an existing rule).
• Routing queue-card paths through scrollIfPinned() instead of scrollToBottom() matches the pattern already established at the streaming-update site (~line 2987), where the codebase already gates on S.activeStreamId for exactly this reason. Good to see the same logic extended to the queue-card insert path.

A couple of things worth manually confirming before merge:

1. Firefox / Safari behavior — overscroll-anchor is well supported in Chromium, Firefox supports it, but it is worth a quick sanity check that scroll-anchoring being off does not introduce visible jank when tool-call cards render on slower devices (the dead-zone widening should compensate).
2. 250px on tall windows — the dead zone is now ~25% of a small mac window but only ~15% of a 1440px-tall desktop. If anyone runs into "the page never re-pins after scrolling up a little", that is the knob to revisit.

The new tests/test_issue1360_streaming_scroll_hardening.py plus the existing tests/test_issue677.py coverage looks like the right surface area. Will defer final approve/merge to maintainer review since this touches user-visible scroll behavior.

Released as part of v0.50.252 — thanks @NocGeek!

This PR was merged into the v0.50.252 release batch via #1387 alongside 5 other contributor fixes. The full CHANGELOG entry is at https://github.com/nesquena/hermes-webui/blob/master/CHANGELOG.md.

Pre-release verification: 3507 pytest tests pass, full QA harness pass (20 structural + 11 browser API + 23 Agent Browser CDP), Opus mentor APPROVED with two non-blocking follow-ups applied during the release batch (force=True on agent redactor, debug-log on profile fallback).

Closing this PR — the change is live on master.