fix(desktop): the composer surface can no longer be widened by its own content

The surface is a grid that never declared a column, and an implicit auto
column sizes to its items' min-content. The coding status row (branch, PR
chip, worktree path, counts — none of it wrapping) out-measured narrow panes
and silently set the track wider than the surface; every w-full child laid
out against that phantom width and overflow-hidden clipped the right edge,
send button first. grid-cols-[minmax(0,1fr)] pins the track to the surface.

apps/desktop/src/app/chat/composer/index.tsx

@@ -321,7 +321,7 @@ export function ChatBar({
     return onCancel()
   }, [activeQueueSessionKeyRef, onCancel])
 
-  const { compactPill, stacked } = useComposerMetrics({
+  const { compactPill, foldVoice, minimal, stacked } = useComposerMetrics({
     composerDockRef,
     composerRef,
     composerSurfaceRef,
@@ -984,7 +984,9 @@ export function ChatBar({
         status: conversation.status
       }}
       disabled={disabled}
+      foldVoice={foldVoice}
       hasComposerPayload={hasComposerPayload}
+      minimal={minimal}
       onDictate={dictate}
       onQueue={queueDraft}
       onToggleAutoSpeak={handleToggleAutoSpeak}
@@ -1242,7 +1244,13 @@ export function ChatBar({
               {hudMode && busy && <span aria-hidden className="arc-border arc-composer" />}
               <div
                 className={cn(
-                  'group/composer-surface relative z-4 isolate grid grid-rows-[auto_1fr] overflow-hidden rounded-[inherit] border border-[color-mix(in_srgb,var(--dt-composer-ring)_calc(18%*var(--composer-ring-strength)),var(--dt-input))]',
+                  // grid-cols-[minmax(0,1fr)]: the implicit `auto` column sized
+                  // itself to its items' min-content, so a status row whose
+                  // content out-measured a narrow pane silently widened the
+                  // track past the surface — and every `w-full` child (the fade,
+                  // the input/controls row) laid out against that phantom width
+                  // and got clipped by overflow-hidden, send button first.
+                  'group/composer-surface relative z-4 isolate grid grid-cols-[minmax(0,1fr)] grid-rows-[auto_1fr] overflow-hidden rounded-[inherit] border border-[color-mix(in_srgb,var(--dt-composer-ring)_calc(18%*var(--composer-ring-strength)),var(--dt-input))]',
                   COMPOSER_DROP_FADE_CLASS,
                   dragActive && COMPOSER_DROP_ACTIVE_CLASS
                 )}
@@ -1322,7 +1330,7 @@ export function ChatBar({
                       <ContribSlot area={COMPOSER_AREAS.leading} />
                     </div>
                     <div className="min-w-0 [grid-area:input]">{input}</div>
-                    <div className="flex items-center justify-end gap-(--composer-control-gap) [grid-area:controls]">
+                    <div className="flex min-w-0 items-center justify-end gap-(--composer-control-gap) [grid-area:controls]">
                       <ContribSlot area={COMPOSER_AREAS.actions} />
                       {controls}
                     </div>