feat: add role-based permissions and profile page improvements

- Add getMyMemberships API endpoint for user role lookup
- Add getMemberRole helper for profile page display
- Add role-based UI controls to study page (owner/researcher only)
- Add canManage checks to experiments, participants, trials pages
- Hide management actions for wizard/observer roles

Backend already enforces permissions; UI now provides cleaner UX

src/app/(dashboard)/profile/page.tsx

@@ -19,6 +19,10 @@ import {
   Loader2,
   Save,
   X,
+  Crown,
+  FlaskConical,
+  Eye,
+  UserCheck,
 } from "lucide-react";
 
 import { Button } from "~/components/ui/button";
@@ -43,6 +47,17 @@ import {
   DialogTrigger,
 } from "~/components/ui/dialog";
 
+interface Membership {
+  studyId: string;
+  role: string;
+  joinedAt: Date;
+}
+
+function getMemberRole(memberships: Membership[], studyId: string): string {
+  const membership = memberships.find((m) => m.studyId === studyId);
+  return membership?.role ?? "observer";
+}
+
 function ProfilePageContent() {
   const { data: session } = useSession();
   const utils = api.useUtils();
@@ -59,6 +74,15 @@ function ProfilePageContent() {
     { enabled: !!session?.user?.id },
   );
 
+  const { data: userStudies } = api.studies.list.useQuery({
+    memberOnly: true,
+    limit: 10,
+  });
+
+  const { data: membershipsData } = api.studies.getMyMemberships.useQuery();
+
+  const studyMemberships = membershipsData ?? [];
+
   const updateProfile = api.users.update.useMutation({
     onSuccess: () => {
       toast.success("Profile updated successfully");
@@ -341,16 +365,45 @@ function ProfilePageContent() {
                 Studies you have access to
               </CardDescription>
             </CardHeader>
-            <CardContent>
+            <CardContent className="space-y-3">
+              {userStudies?.studies.slice(0, 5).map((study) => (
+                <Link
+                  key={study.id}
+                  href={`/studies/${study.id}`}
+                  className="hover:bg-accent/50 flex items-center justify-between rounded-md border p-3 transition-colors"
+                >
+                  <div className="flex items-center gap-3">
+                    <div className="flex h-8 w-8 items-center justify-center rounded-full bg-primary/10">
+                      <span className="text-xs font-medium text-primary">
+                        {(study.name ?? "S").charAt(0).toUpperCase()}
+                      </span>
+                    </div>
+                    <div>
+                      <p className="text-sm font-medium">{study.name}</p>
+                      <p className="text-muted-foreground text-xs capitalize">
+                        {getMemberRole(studyMemberships, study.id)}
+                      </p>
+                    </div>
+                  </div>
+                  <ChevronRight className="h-4 w-4 text-muted-foreground" />
+                </Link>
+              ))}
+              {(!userStudies?.studies.length) && (
                 <div className="flex flex-col items-center justify-center py-4 text-center">
                   <Building className="text-muted-foreground/50 mb-2 h-8 w-8" />
-                <p className="text-sm">View your studies</p>
-                <Button variant="link" size="sm" asChild className="mt-2">
-                  <Link href="/studies">
-                    Go to Studies <ChevronRight className="ml-1 h-3 w-3" />
-                  </Link>
+                  <p className="text-sm">No studies yet</p>
+                  <Button variant="link" size="sm" asChild className="mt-1">
+                    <Link href="/studies/new">Create a study</Link>
                   </Button>
                 </div>
+              )}
+              {userStudies && userStudies.studies.length > 5 && (
+                <Button variant="ghost" size="sm" asChild className="w-full">
+                  <Link href="/studies">
+                    View all {userStudies.studies.length} studies <ChevronRight className="ml-1 h-3 w-3" />
+                  </Link>
+                </Button>
+              )}
             </CardContent>
           </Card>
         </div>

src/app/(dashboard)/studies/[id]/experiments/page.tsx

@@ -31,6 +31,8 @@ export default function StudyExperimentsPage() {
     }
   }, [studyId, selectedStudyId, setSelectedStudyId]);
 
+  const canManage = study?.userRole === "owner" || study?.userRole === "researcher";
+
   return (
     <div className="space-y-6">
       <PageHeader
@@ -38,12 +40,14 @@ export default function StudyExperimentsPage() {
         description="Design and manage experiment protocols for this study"
         icon={FlaskConical}
         actions={
+          canManage ? (
             <Button asChild>
               <a href={`/studies/${studyId}/experiments/new`}>
                 <Plus className="mr-2 h-4 w-4" />
                 Create Experiment
               </a>
             </Button>
+          ) : null
         }
       />
 

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

@@ -60,6 +60,7 @@ type Study = {
   irbProtocol: string | null;
   createdAt: Date;
   updatedAt: Date;
+  userRole?: string;
 };
 
 type Member = {
@@ -157,6 +158,10 @@ export default function StudyDetailPage({ params }: StudyDetailPageProps) {
   ).length;
   const totalTrials = trials.length;
 
+  const userRole = (studyData as any)?.userRole;
+  const canManage = userRole === "owner" || userRole === "researcher";
+  const canRunTrials = userRole === "owner" || userRole === "researcher" || userRole === "wizard";
+
   const stats = {
     experiments: experiments.length,
     totalTrials: totalTrials,
@@ -182,18 +187,22 @@ export default function StudyDetailPage({ params }: StudyDetailPageProps) {
         ]}
         actions={
           <div className="flex items-center gap-2">
+            {canManage && (
               <Button asChild variant="outline">
                 <Link href={`/studies/${study.id}/edit`}>
                   <Settings className="mr-2 h-4 w-4" />
                   Edit Study
                 </Link>
               </Button>
+            )}
+            {canManage && (
               <Button asChild>
                 <Link href={`/studies/${study.id}/experiments/new`}>
                   <Plus className="mr-2 h-4 w-4" />
                   New Experiment
                 </Link>
               </Button>
+            )}
           </div>
         }
       />
@@ -235,12 +244,14 @@ export default function StudyDetailPage({ params }: StudyDetailPageProps) {
             icon="FlaskConical"
             description="Design and manage experimental protocols for this study"
             actions={
+              canManage ? (
                 <Button asChild variant="outline" size="sm">
                   <Link href={`/studies/${study.id}/experiments/new`}>
                     <Plus className="mr-2 h-4 w-4" />
                     Add Experiment
                   </Link>
                 </Button>
+              ) : null
             }
           >
             {experiments.length === 0 ? (
@@ -392,12 +403,14 @@ export default function StudyDetailPage({ params }: StudyDetailPageProps) {
             icon="Users"
             description={`${members.length} team member${members.length !== 1 ? "s" : ""}`}
             actions={
+              canManage ? (
                 <AddMemberDialog studyId={study.id}>
                   <Button variant="outline" size="sm">
                     <Plus className="mr-2 h-4 w-4" />
                     Manage
                   </Button>
                 </AddMemberDialog>
+              ) : null
             }
           >
             <div className="space-y-3">

src/app/(dashboard)/studies/[id]/participants/page.tsx

@@ -31,6 +31,8 @@ export default function StudyParticipantsPage() {
     }
   }, [studyId, selectedStudyId, setSelectedStudyId]);
 
+  const canManage = study?.userRole === "owner" || study?.userRole === "researcher";
+
   return (
     <div className="space-y-6">
       <PageHeader
@@ -38,12 +40,14 @@ export default function StudyParticipantsPage() {
         description="Manage participant registration, consent, and trial assignments for this study"
         icon={Users}
         actions={
+          canManage ? (
             <Button asChild>
               <a href={`/studies/${studyId}/participants/new`}>
                 <Plus className="mr-2 h-4 w-4" />
                 Add Participant
               </a>
             </Button>
+          ) : null
         }
       />
 

src/app/(dashboard)/studies/[id]/trials/page.tsx

@@ -32,6 +32,8 @@ export default function StudyTrialsPage() {
     }
   }, [studyId, selectedStudyId, setSelectedStudyId]);
 
+  const canRun = ["owner", "researcher", "wizard"].includes(study?.userRole ?? "");
+
   return (
     <div className="space-y-6">
       <PageHeader
@@ -39,12 +41,14 @@ export default function StudyTrialsPage() {
         description="Manage trial execution, scheduling, and data collection for this study"
         icon={TestTube}
         actions={
+          canRun ? (
             <Button asChild>
               <Link href={`/studies/${studyId}/trials/new`}>
                 <Plus className="mr-2 h-4 w-4" />
                 Schedule Trial
               </Link>
             </Button>
+          ) : null
         }
       />
 

src/server/api/routers/studies.ts

@@ -1001,4 +1001,20 @@ export const studiesRouter = createTRPCRouter({
 
       return updatedPlugin;
     }),
+
+  getMyMemberships: protectedProcedure.query(async ({ ctx }) => {
+    const userId = ctx.session.user.id;
+
+    const memberships = await ctx.db.query.studyMembers.findMany({
+      where: eq(studyMembers.userId, userId),
+      columns: {
+        studyId: true,
+        role: true,
+        joinedAt: true,
+      },
+      orderBy: [desc(studyMembers.joinedAt)],
+    });
+
+    return memberships;
+  }),
 });