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/page.tsx

@@ -69,8 +69,10 @@ export default function HomePage() {
         {/* KPI row — mockup 04 .kpis (4-up, gold-washed "ממתינים לאישור") */}
         <KPICards cases={data} loading={isPending} />
 
-        {/* two-column body — main flow + narrow gold gate rail (mockup 04 .cols) */}
-        <div className="grid gap-6 lg:grid-cols-[1fr_360px]">
+        {/* two-column body — main flow + narrow gold gate rail (mockup 04 .cols).
+            Rail trimmed 360→280 so the cases table gets the width it needs and
+            no longer needs a horizontal scrollbar (chair request). */}
+        <div className="grid gap-6 lg:grid-cols-[1fr_280px]">
           <div className="space-y-6 min-w-0">
             {/* "תיקים לפי סטטוס" (פסים אופקיים) הוסר — פיזור-הסטטוסים מוצג
                 בדונאט "פיזור סטטוסים" בטור-הצד (#1). */}