feat: add linked accounts page (#883)

* feat(linked-accounts): create page and display linked media server accounts

* feat(dropdown): add new shared Dropdown component

Adds a shared component for plain dropdown menus, based on the headlessui Menu component. Updates
the `ButtonWithDropdown` component to use the same inner components, ensuring that the only
difference between the two components is the trigger button, and both use the same components for
the actual dropdown menu.

* refactor(modal): add support for configuring button props

* feat(linked-accounts): add support for linking/unlinking jellyfin accounts

* feat(linked-accounts): support linking/unlinking plex accounts

* fix(linked-accounts): probibit unlinking accounts in certain cases

Prevents the primary administrator from unlinking their media server account (which would break
sync). Additionally, prevents users without a configured local email and password from unlinking
their accounts, which would render them unable to log in.

* feat(linked-accounts): support linking/unlinking emby accounts

* style(dropdown): improve style class application

* fix(server): improve error handling and API spec

* style(usersettings): improve syntax & performance of user password checks

* style(linkedaccounts): use applicationName in page description

* fix(linkedaccounts): resolve typo

* refactor(app): remove RequestError class

src/components/Common/Dropdown/index.tsx

@@ -0,0 +1,117 @@
+import { withProperties } from '@app/utils/typeHelpers';
+import { Menu, Transition } from '@headlessui/react';
+import { ChevronDownIcon } from '@heroicons/react/24/solid';
+import {
+  Fragment,
+  useRef,
+  type AnchorHTMLAttributes,
+  type ButtonHTMLAttributes,
+  type HTMLAttributes,
+} from 'react';
+
+interface DropdownItemProps extends AnchorHTMLAttributes<HTMLAnchorElement> {
+  buttonType?: 'primary' | 'ghost';
+}
+
+const DropdownItem = ({
+  children,
+  buttonType = 'primary',
+  ...props
+}: DropdownItemProps) => {
+  return (
+    <Menu.Item>
+      <a
+        className={[
+          'button-md flex cursor-pointer items-center rounded px-4 py-2 text-sm leading-5 text-white focus:text-white focus:outline-none',
+          buttonType === 'ghost'
+            ? 'bg-transparent from-indigo-600 to-purple-600 hover:bg-gradient-to-br focus:border-gray-500'
+            : 'bg-indigo-600 hover:bg-indigo-500 focus:border-indigo-700',
+        ].join(' ')}
+        {...props}
+      >
+        {children}
+      </a>
+    </Menu.Item>
+  );
+};
+
+type DropdownItemsProps = HTMLAttributes<HTMLDivElement> & {
+  dropdownType: 'primary' | 'ghost';
+};
+
+const DropdownItems = ({
+  children,
+  className,
+  dropdownType,
+  ...props
+}: DropdownItemsProps) => {
+  return (
+    <Transition
+      as={Fragment}
+      enter="transition ease-out duration-100"
+      enterFrom="opacity-0 scale-95"
+      enterTo="opacity-100 scale-100"
+      leave="transition ease-in duration-75"
+      leaveFrom="opacity-100 scale-100"
+      leaveTo="opacity-0 scale-95"
+    >
+      <Menu.Items
+        className={[
+          'absolute right-0 z-40 mt-2 -mr-1 w-56 origin-top-right rounded-md p-1 shadow-lg',
+          dropdownType === 'ghost'
+            ? 'border border-gray-700 bg-gray-800 bg-opacity-80 backdrop-blur'
+            : 'bg-indigo-600',
+          className,
+        ].join(' ')}
+        {...props}
+      >
+        <div className="py-1">{children}</div>
+      </Menu.Items>
+    </Transition>
+  );
+};
+
+interface DropdownProps extends ButtonHTMLAttributes<HTMLButtonElement> {
+  text: React.ReactNode;
+  dropdownIcon?: React.ReactNode;
+  buttonType?: 'primary' | 'ghost';
+}
+
+const Dropdown = ({
+  text,
+  children,
+  dropdownIcon,
+  className,
+  buttonType = 'primary',
+  ...props
+}: DropdownProps) => {
+  const buttonRef = useRef<HTMLButtonElement>(null);
+
+  return (
+    <Menu as="div" className="relative z-10">
+      <Menu.Button
+        type="button"
+        className={[
+          'button-md inline-flex h-full items-center space-x-2 rounded-md border px-4 py-2 text-sm font-medium leading-5 text-white transition duration-150 ease-in-out hover:z-20 focus:z-20 focus:outline-none',
+          buttonType === 'ghost'
+            ? 'border-gray-600 bg-transparent hover:border-gray-200 focus:border-gray-100 active:border-gray-100'
+            : 'focus:ring-blue border-indigo-500 bg-indigo-600 bg-opacity-80 hover:border-indigo-500 hover:bg-opacity-100 active:border-indigo-700 active:bg-indigo-700',
+          className,
+        ].join(' ')}
+        ref={buttonRef}
+        disabled={!children}
+        {...props}
+      >
+        <span>{text}</span>
+        {children && (dropdownIcon ? dropdownIcon : <ChevronDownIcon />)}
+      </Menu.Button>
+      {children && (
+        <DropdownItems dropdownType={buttonType}>{children}</DropdownItems>
+      )}
+    </Menu>
+  );
+};
+export default withProperties(Dropdown, {
+  Item: DropdownItem,
+  Items: DropdownItems,
+});