feat: Enhance user management and UI components

- Updated user API routes to include imageUrl for better user representation.
- Added @radix-ui/react-toast dependency for improved user notifications.
- Refactored dashboard and studies components to incorporate new user fields and loading states.
- Enhanced the layout and structure of the dashboard, studies, and participants pages for better user experience.
- Implemented a dialog for adding participants, improving the participant management workflow.
- Updated breadcrumb navigation to reflect the current study context more accurately.
- Cleaned up unused imports and optimized component rendering for performance.

src/app/dashboard/studies/[id]/page.tsx

@@ -4,170 +4,179 @@ import { useCallback, useEffect, useState } from "react";
 import { useParams } from "next/navigation";
 import { Card, CardContent, CardDescription, CardHeader, CardTitle } from "~/components/ui/card";
 import { Button } from "~/components/ui/button";
-import { 
-  Users, 
-  FileText, 
-  BarChart, 
-  PlayCircle,
-  Plus,
-  Settings2
-} from "lucide-react";
 import { useToast } from "~/hooks/use-toast";
+import { Plus, Users, FileText, BarChart, PlayCircle } from "lucide-react";
 import Link from "next/link";
+import { useActiveStudy } from "~/context/active-study";
 import { getApiUrl } from "~/lib/fetch-utils";
+import { Skeleton } from "~/components/ui/skeleton";
 
 interface StudyStats {
   participantCount: number;
-  completedTrialsCount: number;
-  pendingFormsCount: number;
+  formCount: number;
+  trialCount: number;
 }
 
 export default function StudyDashboard() {
   const [stats, setStats] = useState<StudyStats>({
     participantCount: 0,
-    completedTrialsCount: 0,
-    pendingFormsCount: 0,
+    formCount: 0,
+    trialCount: 0,
   });
-  const [loading, setLoading] = useState(true);
+  const [isLoading, setIsLoading] = useState(true);
   const { id } = useParams();
   const { toast } = useToast();
+  const { activeStudy } = useActiveStudy();
 
-  const fetchStudyStats = useCallback(async () => {
+  const fetchStats = useCallback(async () => {
     try {
       const response = await fetch(getApiUrl(`/api/studies/${id}/stats`));
-      if (!response.ok) throw new Error("Failed to fetch study statistics");
-      const data = await response.json();
-      setStats(data.data);
+      if (!response.ok) throw new Error("Failed to fetch stats");
+      const { data } = await response.json();
+      setStats({
+        participantCount: data?.participantCount ?? 0,
+        formCount: data?.formCount ?? 0,
+        trialCount: data?.trialCount ?? 0
+      });
     } catch (error) {
-      console.error("Error fetching study stats:", error);
+      console.error("Error fetching stats:", error);
       toast({
         title: "Error",
         description: "Failed to load study statistics",
         variant: "destructive",
       });
+      // Set default values on error
+      setStats({
+        participantCount: 0,
+        formCount: 0,
+        trialCount: 0
+      });
     } finally {
-      setLoading(false);
+      setIsLoading(false);
     }
   }, [toast, id]);
 
   useEffect(() => {
-    fetchStudyStats();
-  }, [fetchStudyStats]);
+    fetchStats();
+  }, [fetchStats]);
 
-  if (loading) {
+  if (isLoading) {
     return (
-      <div className="flex items-center justify-center min-h-[400px]">
-        <div className="animate-spin h-8 w-8 border-4 border-primary border-t-transparent rounded-full" />
+      <div className="space-y-6">
+        <div className="flex items-center justify-between">
+          <div>
+            <Skeleton className="h-8 w-[200px] mb-2" />
+            <Skeleton className="h-4 w-[300px]" />
+          </div>
+        </div>
+
+        <div className="grid gap-4 grid-cols-1 md:grid-cols-3">
+          {[1, 2, 3].map((i) => (
+            <Card key={i}>
+              <CardHeader className="flex flex-row items-center justify-between space-y-0 pb-2">
+                <Skeleton className="h-4 w-[100px]" />
+                <Skeleton className="h-4 w-4" />
+              </CardHeader>
+              <CardContent>
+                <Skeleton className="h-7 w-[50px] mb-1" />
+                <Skeleton className="h-3 w-[120px]" />
+              </CardContent>
+            </Card>
+          ))}
+        </div>
+
+        <Card>
+          <CardHeader>
+            <Skeleton className="h-5 w-[120px] mb-2" />
+            <Skeleton className="h-4 w-[200px]" />
+          </CardHeader>
+          <CardContent className="flex gap-4">
+            <Skeleton className="h-10 w-[140px]" />
+            <Skeleton className="h-10 w-[120px]" />
+          </CardContent>
+        </Card>
       </div>
     );
   }
 
   return (
     <div className="space-y-6">
-      <div className="grid gap-4 md:grid-cols-3">
+      <div className="flex items-center justify-between">
+        <div>
+          <h2 className="text-2xl font-bold tracking-tight">{activeStudy?.title}</h2>
+          <p className="text-muted-foreground">
+            Overview of your study&apos;s progress and statistics
+          </p>
+        </div>
+      </div>
+
+      <div className="grid gap-4 grid-cols-1 md:grid-cols-3">
         <Card>
           <CardHeader className="flex flex-row items-center justify-between space-y-0 pb-2">
-            <CardTitle className="text-sm font-medium">Participants</CardTitle>
+            <CardTitle className="text-sm font-medium">
+              Participants
+            </CardTitle>
             <Users className="h-4 w-4 text-muted-foreground" />
           </CardHeader>
           <CardContent>
             <div className="text-2xl font-bold">{stats.participantCount}</div>
-            <p className="text-xs text-muted-foreground">Total participants enrolled</p>
+            <p className="text-xs text-muted-foreground">
+              Total enrolled participants
+            </p>
           </CardContent>
         </Card>
 
         <Card>
           <CardHeader className="flex flex-row items-center justify-between space-y-0 pb-2">
-            <CardTitle className="text-sm font-medium">Completed Trials</CardTitle>
-            <PlayCircle className="h-4 w-4 text-muted-foreground" />
-          </CardHeader>
-          <CardContent>
-            <div className="text-2xl font-bold">{stats.completedTrialsCount}</div>
-            <p className="text-xs text-muted-foreground">Successfully completed trials</p>
-          </CardContent>
-        </Card>
-
-        <Card>
-          <CardHeader className="flex flex-row items-center justify-between space-y-0 pb-2">
-            <CardTitle className="text-sm font-medium">Pending Forms</CardTitle>
+            <CardTitle className="text-sm font-medium">
+              Forms
+            </CardTitle>
             <FileText className="h-4 w-4 text-muted-foreground" />
           </CardHeader>
           <CardContent>
-            <div className="text-2xl font-bold">{stats.pendingFormsCount}</div>
-            <p className="text-xs text-muted-foreground">Forms awaiting completion</p>
-          </CardContent>
-        </Card>
-      </div>
-
-      <div className="grid gap-4 md:grid-cols-2">
-        <Card>
-          <CardHeader>
-            <CardTitle>Quick Actions</CardTitle>
-            <CardDescription>Common tasks for this study</CardDescription>
-          </CardHeader>
-          <CardContent className="space-y-2">
-            <Button
-              variant="outline"
-              className="w-full justify-start"
-              asChild
-            >
-              <Link href={`/dashboard/studies/${id}/participants/new`}>
-                <Plus className="mr-2 h-4 w-4" />
-                Add Participant
-              </Link>
-            </Button>
-            <Button
-              variant="outline"
-              className="w-full justify-start"
-              asChild
-            >
-              <Link href={`/dashboard/studies/${id}/trials/new`}>
-                <PlayCircle className="mr-2 h-4 w-4" />
-                Start New Trial
-              </Link>
-            </Button>
-            <Button
-              variant="outline"
-              className="w-full justify-start"
-              asChild
-            >
-              <Link href={`/dashboard/studies/${id}/forms/new`}>
-                <FileText className="mr-2 h-4 w-4" />
-                Create Form
-              </Link>
-            </Button>
+            <div className="text-2xl font-bold">{stats.formCount}</div>
+            <p className="text-xs text-muted-foreground">
+              Active study forms
+            </p>
           </CardContent>
         </Card>
 
         <Card>
-          <CardHeader>
-            <CardTitle>Recent Activity</CardTitle>
-            <CardDescription>Latest updates and changes</CardDescription>
+          <CardHeader className="flex flex-row items-center justify-between space-y-0 pb-2">
+            <CardTitle className="text-sm font-medium">
+              Trials
+            </CardTitle>
+            <BarChart className="h-4 w-4 text-muted-foreground" />
           </CardHeader>
-          <CardContent className="space-y-2">
-            <Button
-              variant="outline"
-              className="w-full justify-start"
-              asChild
-            >
-              <Link href={`/dashboard/studies/${id}/analysis`}>
-                <BarChart className="mr-2 h-4 w-4" />
-                View Analytics
-              </Link>
-            </Button>
-            <Button
-              variant="outline"
-              className="w-full justify-start"
-              asChild
-            >
-              <Link href={`/dashboard/studies/${id}/settings`}>
-                <Settings2 className="mr-2 h-4 w-4" />
-                Study Settings
-              </Link>
-            </Button>
+          <CardContent>
+            <div className="text-2xl font-bold">{stats.trialCount}</div>
+            <p className="text-xs text-muted-foreground">
+              Completed trials
+            </p>
           </CardContent>
         </Card>
       </div>
+
+      <Card>
+        <CardHeader>
+          <CardTitle>Quick Actions</CardTitle>
+          <CardDescription>Common tasks and actions for this study</CardDescription>
+        </CardHeader>
+        <CardContent className="flex gap-4">
+          <Button asChild>
+            <Link href={`/dashboard/studies/${id}/participants/new`}>
+              <Plus className="w-4 h-4 mr-2" />
+              Add Participant
+            </Link>
+          </Button>
+          <Button variant="outline" asChild>
+            <Link href={`/dashboard/studies/${id}/trials/new`}>
+              <PlayCircle className="w-4 h-4 mr-2" />
+              Start Trial
+            </Link>
+          </Button>
+        </CardContent>
+      </Card>
     </div>
   );
 }