iris bench: a press only reaches what the pointer is on (ai-app-2 5e34dba)

Iris's report on the previous bench build: a vertical scroll locked to a
horizontal scroll area whose fling was still running, and the message
box clipping its text 12dp inside its own edge.

README.md

@@ -11,6 +11,35 @@ no enrolment and no permissions.
 
 The rest of this file is the runbook that was delivered with the APKs.
 
+**2026-09-08 (later still): the scroll lock, and the input box's clip.**
+`iris-bench-arm64.apk` rebuilt from ai-app-2 `5e34dba`. Both are from
+your report on the bench build, and both have a test that fails without
+the change.
+
+- **"If I try to scroll vertically while a horizontal scroll animation
+  is still active, it stays locked to the horizontal scroll."** Your
+  diagnosis was the right one: it was global state, and the fling had
+  nothing to do with it. A widget kept receiving presses for one frame
+  *after* the finger left it (the frame that exists so a hover can end),
+  and a press landing on something that is already coasting commits to a
+  pan immediately, with no slop -- so a code fence grabbed the whole
+  gesture from wherever on the screen you actually touched. Measured
+  before the fix: a finger put down 500px above a coasting fence and
+  dragged 160px down the screen moved the list by nothing at all. A
+  press now only reaches the widget it is actually on. What to try:
+  flick a code block sideways and, while it is still moving, scroll the
+  transcript up and down somewhere else -- the transcript should follow
+  your finger and the code block should carry on coasting on its own.
+  Putting a finger down *on* the coasting block still catches it,
+  whichever way you then drag, which is what Compose does.
+- **"The message input box doesn't clip correctly."** It was clipped 12dp
+  inside its own edge, so a long message was sliced through the middle of
+  a line of text with a band of bare grey above the cut. The box itself
+  is the clip now -- the same rounded rect that draws the bar is what the
+  text is cut to, so text disappears under its edge. The padding still
+  holds the text off the edge at the end you are typing at. What to try:
+  type or paste more than six lines and scroll inside the box.
+
 **2026-09-08 (late): the four defects from your second report.**
 `iris-bench-arm64.apk` rebuilt from ai-app-2 `a2e5e58`. Everything here
 comes from the report you sent, and each one has a test that fails