Full-width cards on compose

Drop the max-w-4xl wrapper so the compose cards fill the available
width of the AppShell main (which is already capped at 1400px
upstream). Threshold claim / issue cards with long Hebrew prose
now get the room they need without horizontal dead space.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

web-ui/src/app/cases/[caseNumber]/compose/page.tsx

@@ -115,8 +115,7 @@ export default function ComposePage({
             </CardContent>
           </Card>
         ) : analysis.data ? (
-          <div className="max-w-4xl">
-            <div className="space-y-6">
+          <div className="space-y-6">
               {/* Case-level general precedents */}
               <Card className="bg-surface border-rule shadow-sm">
                 <CardContent className="px-6 py-5">
@@ -225,7 +224,6 @@ export default function ComposePage({
                   </CardContent>
                 </Card>
               )}
-            </div>
           </div>
         ) : null}
       </section>