fix: update user fields to match schema

- Replace firstName/lastName with name field in users API route
- Update user formatting in UsersTab component
- Add email fallback when name is not available

src/app/dashboard/layout.tsx

@@ -1,6 +1,7 @@
 import { Sidebar } from "~/components/sidebar";
 import { cn } from "~/lib/utils";
 import { StudyProvider } from "~/context/StudyContext";
+import { ActiveStudyProvider } from "~/context/active-study";
 
 export default function DashboardLayout({
   children,
@@ -8,17 +9,19 @@ export default function DashboardLayout({
   children: React.ReactNode
 }) {
   return (
-    <StudyProvider>
-      <div className="flex h-screen overflow-hidden">
-        <Sidebar />
-        <main className={cn(
-          "flex-1 overflow-y-auto",
-          "lg:pt-8 p-8",
-          "pt-[calc(3.5rem+2rem)]"
-        )}>
-          {children}
-        </main>
-      </div>
-    </StudyProvider>
+    <ActiveStudyProvider>
+      <StudyProvider>
+        <div className="flex h-screen overflow-hidden">
+          <Sidebar />
+          <main className={cn(
+            "flex-1 overflow-y-auto",
+            "lg:pt-8 p-8",
+            "pt-[calc(3.5rem+2rem)]"
+          )}>
+            {children}
+          </main>
+        </div>
+      </StudyProvider>
+    </ActiveStudyProvider>
   );
 }