An admin area a phone could reach and not navigate

Administration has a nav of its own rather than the chat sidebar, and 1.1.0
gave every `.sidebar` the drawer behaviour -- starts closed, slides in --
without giving that one any of the drawer's furniture. No id for the toggle to
resolve, no toggle, no close, no scrim: it sat at left:-280 with nothing in the
application able to open it. The close button and the scrim are partials now,
used by both, and the test that guards it *finds* sidebars by scanning the
templates rather than working from a list, which is exactly why this one was
missed.

The chat, measured at 390px, spent forty pixels of side padding and a
forty-four pixel avatar column before drawing a word -- close to a quarter of
the screen on margin, so anything that could not wrap had to be reached
sideways. Padding halved and the avatar moved above the turn; a code block
gained about sixty pixels.

Worse in the same row: `.topbar__actions` asked for 317px of a 390px bar,
because the control that used to give in that row is display:none below a
tablet width, so the group went rigid and the title -- flex: 1 -- was squeezed
to exactly zero. And `.btn--icon` sets a width with no `flex: none`, so the row
shrank the button instead of the text: the sidebar toggle measured eighteen
pixels across. The picker gives now, and shows its avatar rather than its name
on a phone.

Also the instrument, which lied twice more: it could not see horizontal
overflow at all, because `.shell` is overflow:hidden and its "is this
contained" test therefore answered yes for everything on the page; and run from
a copy it resolved `STATIC` to a directory that did not exist, rewrote every
asset URL to a dead file:// path and reported the whole application overflowing
by thirty thousand pixels. It resolves from the imported package now and
asserts that what it rewrote to is really there.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

CHANGELOG.md

@@ -16,6 +16,36 @@ for 1.0.0 have something to be assembled from.
 
 ## Unreleased
 
+## 1.1.2
+
+Two things a phone found that 1.1.0's phone pass had not.
+
+- Fixed: **the administration area could not be navigated on a phone.** Admin
+  has a nav of its own rather than the chat sidebar, and 1.1.0 gave every
+  sidebar the drawer behaviour — starts closed, slides in — without giving that
+  one any of the drawer's furniture. So it sat off-screen with no button to open
+  it, no close, and nothing to tap beside it: every administration page was
+  reachable and then a dead end. It now opens, closes and dims the page like the
+  other one, and a test refuses any future sidebar that cannot be opened.
+- Fixed: **the chat gave nearly a quarter of a phone screen to margins**, so
+  anything that could not wrap had to be scrolled to sideways. The thread's side
+  padding is halved, and the speaker's avatar moves above the turn instead of
+  sitting in a 44px column beside every line of it — a code block gained about
+  sixty pixels of readable width.
+- Fixed: **the chat's title was squeezed to nothing.** The row's designated
+  shrinker is hidden below a tablet width, so on a phone the controls went rigid
+  and asked for 317 pixels of a 390 pixel bar; the heading was not truncated, it
+  simply stopped occupying space. The model picker gives now, and on a phone it
+  shows its avatar rather than its name — the name is one tap away and the
+  title is not.
+- Tick boxes and the smaller buttons are big enough to hit on a phone. A
+  checkbox is drawn by the browser at about sixteen pixels whatever the type
+  around it, which made it the smallest target in the application by some way,
+  and the admin lists are mostly checkboxes.
+- Fixed: **icon buttons could be squashed below their own size.** The sidebar
+  toggle measured eighteen pixels across on a phone, under half its target,
+  because a full row shrank the button rather than the text beside it.
+
 ## 1.1.1
 
 One bug, and it is the one that made 1.1.0 look broken the moment you updated to