diff --git a/frontend/src/components/ApplicationInfo.tsx b/frontend/src/components/ApplicationInfo.tsx
index 1f3e19f..0653b96 100644
--- a/frontend/src/components/ApplicationInfo.tsx
+++ b/frontend/src/components/ApplicationInfo.tsx
@@ -1176,7 +1176,7 @@ function InfoRow({ label, value, referenceValue, infoDescription, jiraHost }: {
   const description = infoDescription || referenceValue?.description || null;
   
   // Debug: log referenceValue info for fields that should have descriptions
-  if (referenceValue && process.env.NODE_ENV === 'development') {
+  if (referenceValue && import.meta.env.DEV) {
   }
 
   return (
diff --git a/frontend/src/components/Profile.tsx b/frontend/src/components/Profile.tsx
index 6f14fe2..e518b64 100644
--- a/frontend/src/components/Profile.tsx
+++ b/frontend/src/components/Profile.tsx
@@ -1,5 +1,5 @@
 import { useState, useEffect } from 'react';
-import { useAuthStore } from '../stores/authStore';
+// import { useAuthStore } from '../stores/authStore'; // Unused for now
 
 const API_BASE = import.meta.env.VITE_API_URL || 'http://localhost:3001';
 
@@ -14,7 +14,7 @@ interface Profile {
 }
 
 export default function Profile() {
-  const { user } = useAuthStore();
+  // const { user } = useAuthStore(); // Unused for now
   const [profile, setProfile] = useState<Profile | null>(null);
   const [isLoading, setIsLoading] = useState(true);
   const [isSaving, setIsSaving] = useState(false);
diff --git a/frontend/src/components/ProfileSettings.tsx b/frontend/src/components/ProfileSettings.tsx
index 80e00fc..ce1474f 100644
--- a/frontend/src/components/ProfileSettings.tsx
+++ b/frontend/src/components/ProfileSettings.tsx
@@ -280,14 +280,14 @@ export default function ProfileSettings() {
     return profile?.username.substring(0, 2).toUpperCase() || 'U';
   };
 
-  const formatDate = (dateString: string | null) => {
-    if (!dateString) return 'Nog niet ingelogd';
-    return new Date(dateString).toLocaleDateString('nl-NL', {
-      year: 'numeric',
-      month: 'long',
-      day: 'numeric',
-    });
-  };
+  // const formatDate = (dateString: string | null) => {
+  //   if (!dateString) return 'Nog niet ingelogd';
+  //   return new Date(dateString).toLocaleDateString('nl-NL', {
+  //     year: 'numeric',
+  //     month: 'long',
+  //     day: 'numeric',
+  //   });
+  // };
 
   if (isLoading) {
     return (
diff --git a/frontend/src/components/RoleManagement.tsx b/frontend/src/components/RoleManagement.tsx
index d3fa723..6aa8409 100644
--- a/frontend/src/components/RoleManagement.tsx
+++ b/frontend/src/components/RoleManagement.tsx
@@ -92,21 +92,21 @@ export default function RoleManagement() {
     }
   };
 
-  const handleUpdateRole = async (roleId: number, name: string, description: string) => {
-    try {
-      const response = await fetch(`${API_BASE}/api/roles/${roleId}`, {
-        method: 'PUT',
-        headers: { 'Content-Type': 'application/json' },
-        credentials: 'include',
-        body: JSON.stringify({ name, description: description || null }),
-      });
+  // const handleUpdateRole = async (roleId: number, name: string, description: string) => {
+  //   try {
+  //     const response = await fetch(`${API_BASE}/api/roles/${roleId}`, {
+  //       method: 'PUT',
+  //       headers: { 'Content-Type': 'application/json' },
+  //       credentials: 'include',
+  //       body: JSON.stringify({ name, description: description || null }),
+  //     });
 
-      if (!response.ok) throw new Error('Failed to update role');
-      fetchRoles();
-    } catch (err) {
-      setError(err instanceof Error ? err.message : 'Failed to update role');
-    }
-  };
+  //     if (!response.ok) throw new Error('Failed to update role');
+  //     fetchRoles();
+  //   } catch (err) {
+  //     setError(err instanceof Error ? err.message : 'Failed to update role');
+  //   }
+  // };
 
   const handleDeleteRole = async (roleId: number) => {
     if (!confirm('Are you sure you want to delete this role?')) return;
diff --git a/frontend/src/components/UserManagement.tsx b/frontend/src/components/UserManagement.tsx
index 21b5277..2f48d38 100644
--- a/frontend/src/components/UserManagement.tsx
+++ b/frontend/src/components/UserManagement.tsx
@@ -32,7 +32,7 @@ export default function UserManagement() {
   const [showPasswordModal, setShowPasswordModal] = useState(false);
   const [selectedUser, setSelectedUser] = useState<User | null>(null);
   const [searchTerm, setSearchTerm] = useState('');
-  const [expandedUser, setExpandedUser] = useState<number | null>(null);
+  // const [expandedUser, setExpandedUser] = useState<number | null>(null); // Unused for now
   const [actionMenuOpen, setActionMenuOpen] = useState<number | null>(null);
 
   const hasManageUsers = useHasPermission('manage_users');
diff --git a/frontend/src/components/UserSettings.tsx b/frontend/src/components/UserSettings.tsx
index 449e0e0..3bcadde 100644
--- a/frontend/src/components/UserSettings.tsx
+++ b/frontend/src/components/UserSettings.tsx
@@ -1,5 +1,5 @@
 import { useState, useEffect } from 'react';
-import { useAuthStore } from '../stores/authStore';
+// import { useAuthStore } from '../stores/authStore'; // Unused for now
 
 const API_BASE = import.meta.env.VITE_API_URL || 'http://localhost:3001';
 
@@ -13,7 +13,7 @@ interface UserSettings {
 }
 
 export default function UserSettings() {
-  const { user } = useAuthStore();
+  // const { user } = useAuthStore(); // Unused for now
   const [settings, setSettings] = useState<UserSettings>({
     jira_pat: null,
     ai_enabled: false,
@@ -69,7 +69,7 @@ export default function UserSettings() {
     }
   };
 
-  const handleSave = async (e: React.FormEvent) => {
+  const handleSave = async (e: React.FormEvent<HTMLFormElement>) => {
     e.preventDefault();
     setIsSaving(true);
     setError(null);