fix(nav): avoid Kanban flyout state update racing with RSC navigation

A click outside the Kanban sidebar flyout called setOpen(false) even when
the click was on a Link, so the deferred state update landed during the
Link navigation's RSC stream and corrupted Turbopack's flight client
(vercel/next.js#92362).

Skip the close when the click target is inside an <a> and flush the close
synchronously from the Link's own onClick so the state update completes
before navigation, not during RSC processing.

src/components/shell/kanban-nav.tsx

@@ -1,6 +1,7 @@
 "use client";
 
 import { useEffect, useRef, useState } from "react";
+import { flushSync } from "react-dom";
 import Link from "next/link";
 import { Kanban } from "lucide-react";
 
@@ -36,6 +37,11 @@ export function KanbanNav({
         containerRef.current &&
         !containerRef.current.contains(event.target as Node)
       ) {
+        // Skip closing when the click is on an anchor. The Link's own
+        // onClick closes the flyout via flushSync below, and racing a
+        // deferred state update with the navigation's RSC stream
+        // corrupts Turbopack's flight client (vercel/next.js#92362).
+        if ((event.target as HTMLElement).closest("a")) return;
         setOpen(false);
       }
     }
@@ -80,7 +86,11 @@ export function KanbanNav({
                   <Link
                     key={project.id}
                     href={`/p/${group.client.slug}/${project.slug}`}
-                    onClick={() => setOpen(false)}
+                    onClick={() => {
+                      // Force the close to land before navigation, not
+                      // during RSC stream processing — see #92362 above.
+                      flushSync(() => setOpen(false));
+                    }}
                     className="flex items-center justify-between gap-2 rounded-lg px-2 py-1.5 text-xs text-text-secondary transition-colors hover:bg-surface-raised hover:text-text-primary"
                   >
                     <span className="truncate">{project.name}</span>