Improve component stability and user experience with safety checks

Implement robust error handling, safety checks for data structures, and state management improvements across various components to prevent runtime errors and enhance user experience.

Replit-Commit-Author: Agent
Replit-Commit-Session-Id: a71e826a-1d38-4b6e-a34f-fbf5ba1f1b25
Replit-Commit-Checkpoint-Type: intermediate_checkpoint

src/hooks/useSidebar.ts

@@ -0,0 +1,11 @@
+import { useContext } from "react";
+import { SidebarContext } from "@/components/ui/sidebar-context";
+
+export function useSidebar() {
+  const context = useContext(SidebarContext);
+  if (!context) {
+    throw new Error("useSidebar must be used within a SidebarProvider.");
+  }
+
+  return context;
+}