perf: reduce startup request fanout

Avoid repeated sidebar session and worktree refreshes
Limit concurrent GitHub PR status checks
Reuse cached worktree root resolution

packages/ui/src/components/session/SessionSidebar.tsx

@@ -360,6 +360,22 @@ export const SessionSidebar: React.FC<SessionSidebarProps> = ({
     syncSessionsSnapshotRef.current = liveSessions;
   }, [syncSessionStructureSignature, liveSessions]);
 
+  const projectWorktreeDiscoveryKey = React.useMemo(
+    () => projects
+      .map((project) => `${project.id}:${normalizePath(project.path) ?? ''}`)
+      .join('|'),
+    [projects],
+  );
+
+  const initialGlobalSessionsRefreshStartedRef = React.useRef(false);
+  React.useEffect(() => {
+    if (initialGlobalSessionsRefreshStartedRef.current) {
+      return;
+    }
+    initialGlobalSessionsRefreshStartedRef.current = true;
+    void refreshGlobalSessions(syncSessionsSnapshotRef.current);
+  }, []);
+
   React.useEffect(() => {
     let cancelled = false;
 
@@ -397,13 +413,12 @@ export const SessionSidebar: React.FC<SessionSidebarProps> = ({
       });
     };
 
-    void refreshGlobalSessions(syncSessionsSnapshotRef.current);
     void discoverWorktrees();
 
     return () => {
       cancelled = true;
     };
-  }, [currentDirectory, syncSessionStructureSignature, projects]);
+  }, [projectWorktreeDiscoveryKey]);
 
   React.useEffect(() => {
     let refreshTimeout: ReturnType<typeof setTimeout> | null = null;
@@ -1113,7 +1128,6 @@ export const SessionSidebar: React.FC<SessionSidebarProps> = ({
     });
 
     void refreshPrStatusTargets([...uniqueTargets.values()], {
-      force: true,
       silent: true,
       markInitialResolved: true,
     });