lsm / neokai / 24872378326

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fix(web): keep last chat message visible above floating composer (#1617)

The chat scroll container is extended beneath the floating composer for
the glassmorphism effect, but auto-scroll was landing at the true bottom
of the container — which is underneath the composer — so newly arrived
messages appeared hidden behind the input instead of above it.

- `getMessagesBottomPaddingPx` now derives padding from the live footer
  height + a small clearance buffer (was baseline-112 minus-96, which
  always left ~16px of the last message clipped). MIN/MAX are bumped to
  128/320 to match the new intent.
- Mirror `--messages-bottom-padding` as `scroll-padding-bottom` on the
  messages container so `scrollIntoView` and any browser-driven scroll
  (focus, anchor) stops short of the composer.
- `useAutoScroll` uses `scrollIntoView({ block: 'end' })` so the end
  sentinel honors scroll-padding-bottom and the newest message lands
  just above the composer.

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