A model menu that stays on the phone

Inside a chat the picker sits mid-bar with the panel buttons to its right,
and its menu opened from the picker's right edge -- at 390px it spanned
x = -132..226, cutting every model's name off. Below 48rem the bar is now
the containing block and the menu is pinned between its edges (capped at
24rem). Opening it on a touchscreen no longer focuses the filter, which
raised the keyboard over half the list.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

CHANGELOG.md

@@ -16,6 +16,23 @@ for 1.0.0 have something to be assembled from.
 
 ## Unreleased
 
+## 1.8.3
+
+The model picker on a phone, which could not be read once a chat was open.
+
+- **The model menu no longer runs off the left of the screen.** Inside a chat
+  the picker sits in the middle of the top bar, with the panel buttons to its
+  right, and its menu opened from the picker's right edge — so on a phone most
+  of it was off the screen and every model's name was cut off. On a narrow
+  screen the menu now hangs from the bar itself, edge to edge, and every name is
+  whole. Wider screens are unchanged.
+
+- **Opening it on a touchscreen no longer raises the keyboard.** With more than
+  eight models the menu has a filter box, and it took the focus on opening — so
+  the keyboard came up and covered half the list you had opened it to choose
+  from. On a touchscreen the chosen model takes the focus instead; the filter is
+  one tap away. With a mouse, typing straight into the filter works as before.
+
 ## 1.8.2
 
 The model lists, made readable. Both printed every capability switch as a tag —