fix(ui): nav & layout — decision-editor in band, compose back-link, wider cases table

Chair-directed navigation/layout fixes (existing components, no new design):

1. "פתח עורך החלטה" moved into the case-page band actions (right after "העלאת
   מסמכים") so it's reachable from EVERY tab, not only סקירה. Removed the now-
   redundant full-width CTA from the overview tab.
2. Prominent "→ חזרה לדף התיק" back-link added to the /compose header (the
   breadcrumb link was too subtle).
3. Home cases table: rail trimmed 360→280px and the title cell made min-w-0 so the
   table gets the width it needs and no longer shows a horizontal scrollbar.

No backend / API change. The larger NEW citation-verification panel stays gated
behind Claude Design (preview 24-citation-verification already pushed).

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

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

@@ -236,6 +236,12 @@ export default function ComposePage({
           <span aria-hidden>·</span>
           <span className="text-navy">עורך החלטה</span>
         </nav>
+        <Link
+          href={`/cases/${caseNumber}`}
+          className="inline-flex items-center gap-1.5 mb-3 rounded-md border border-rule bg-surface px-3 py-1.5 text-[0.82rem] font-semibold text-gold-deep hover:bg-gold-wash hover:text-navy transition-colors"
+        >
+          <span aria-hidden>→</span> חזרה לדף התיק
+        </Link>
         <div className="flex items-center gap-3 flex-wrap">
           <h1 className="text-navy text-2xl font-bold mb-0">ערר {caseNumber}</h1>
           <StatusChip status={caseQuery.data?.status} />