Add download button for analysis-and-research.md

New GET /api/cases/{n}/research/analysis/download endpoint returns the
raw markdown file. UI adds a "הורד ניתוח" button next to "חזרה לתיק"
on the compose page, visible only when analysis data is loaded.

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

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

@@ -78,9 +78,24 @@ export default function ComposePage({
               </p>
             )}
           </div>
-          <Button asChild variant="outline">
-            <Link href={`/cases/${caseNumber}`}>חזרה לתיק</Link>
-          </Button>
+          <div className="flex items-center gap-2">
+            {analysis.data && (
+              <Button
+                variant="outline"
+                onClick={() => {
+                  const a = document.createElement("a");
+                  a.href = `/api/cases/${caseNumber}/research/analysis/download`;
+                  a.download = `analysis-${caseNumber}.md`;
+                  a.click();
+                }}
+              >
+                הורד ניתוח
+              </Button>
+            )}
+            <Button asChild variant="outline">
+              <Link href={`/cases/${caseNumber}`}>חזרה לתיק</Link>
+            </Button>
+          </div>
         </div>
 
         <div className="h-[2px] bg-gradient-to-l from-transparent via-gold to-transparent" />