## Release v0.51.240 — Release HH (stage-q12)
Mobile UX bug-fix — UX-approved via Telegram.
### Fixed
| PR | Author | Fix |
|----|--------|-----|
| #3470 | @cnogrin | On mobile/touch, you can now **swipe up to stop streaming auto-scroll**. Previously the view snapped to the bottom on every token with no way to read earlier content while a response streamed — `_recordNonMessageScrollIntent()` only detected upward intent on the wheel path (`e.deltaY`), and touch events have no `deltaY`. Now tracks `_touchStartY` on `touchstart` and treats a `touchmove` that drags the finger down >8px (= scroll up into history, `scrollTop` decreases) as upward intent, setting the same `_messageUserUnpinned` flag the wheel path + scroll listener use. |
### Why this is safe for existing installs
- **Only ADDS a touch-unpin path** — wheel + desktop behavior completely untouched, no existing branch modified.
- New `touchstart`/`touchend`/`touchcancel` listeners are **passive + capture-only** (they only write `_touchStartY`), so they can't interfere with existing touch handling.
- Net effect for users: mobile users *gain* the ability to scroll up during streaming (which was simply broken before). No one's working flow changes.
### Absorbed on review (Codex CORE MUST-FIX)
The contributor's gesture sign was inverted (`dy<-8` = finger up = *follow* the stream), which would have unpinned in the wrong direction. Corrected to `dy>8` to match the existing scroll listener's `movedUp` semantics; fixed the comment; strengthened the regression test to pin the gesture direction.
### Gate
- Full pytest suite: **7503 passed, 9 skipped, 3 xpassed, 0 failed**
- ESLint runtime gate: CLEAN · browser-smoke: CLEAN
- Codex (regression): SHIP-ONLY-WITH-FIXES (inverted sign) → fixed → re-reviewed **SAFE TO SHIP**
- Regression test `tests/test_issue3470_touch_unpin_streaming_scroll.py` (verified to fail against master)
UX-approved via Telegram (mobile touch-gesture behavior, no visual/layout delta to screenshot).
Co-authored-by: cnogrin <cnogrin@users.noreply.github.com>
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