Implement Password Grant Flow for Authentication and Enhance User Experience

- Introduced Password Grant Flow for user authentication, allowing direct login with email and password.
- Updated `useAuth` composable to manage login and logout processes, including Single Sign-Out from Cidaas.
- Enhanced user interface with a new `UserMenu` component displaying user information and logout functionality.
- Updated homepage to show personalized greetings for logged-in users and a login prompt for guests.
- Added logout confirmation page with a countdown redirect to the homepage.
- Documented the implementation details and future enhancements for OAuth2 flows in CLAUDE.md and other relevant documentation.
- Added test credentials and guidelines for automated testing in the new TESTING.md file.

app/components/CommonFooter.vue

@@ -14,8 +14,9 @@ const currentYear = new Date().getFullYear()
             </NuxtLink>
           </div>
           <p>
-            experimenta ist Deutschlands größtes Science Center. Mit über 275 Mitmachstationen, vier
-            Kreativstudios, neun Laboren und einer Sternwarte.
+            Die experimenta ist Deutschlands größtes Science Center mit interaktiven Experimenten zum
+            Anfassen, Forscherlaboren, Kreativwerkstätten und
+            dem weltweit einzigartigen Science Dome – ein außerschulischer Lernort für alle Altersgruppen.
           </p>
         </div>
 

app/components/CommonHeader.vue

@@ -1,13 +1,20 @@
 <script setup lang="ts">
-// experimenta header with branding
+// experimenta header with branding and user menu
+const { loggedIn } = useAuth()
 </script>
 
 <template>
   <header class="header-wrapper">
     <div class="header-content">
+      <!-- Logo (left side) -->
       <NuxtLink to="/" class="logo">
         <img src="/img/experimenta-logo-white.svg" alt="experimenta Logo" class="logo-svg" />
       </NuxtLink>
+
+      <!-- User Menu (right side, only when logged in) -->
+      <div v-if="loggedIn" class="user-menu">
+        <UserMenu />
+      </div>
     </div>
   </header>
 </template>
@@ -26,7 +33,7 @@
   margin: 0 auto;
   padding: 0 20px;
   display: flex;
-  justify-content: center;
+  justify-content: space-between;
   align-items: center;
 }
 
@@ -60,4 +67,9 @@
     width: 200px;
   }
 }
+
+.user-menu {
+  display: flex;
+  align-items: center;
+}
 </style>

app/components/UserMenu.vue

@@ -0,0 +1,90 @@
+<script setup lang="ts">
+import { User, LogOut } from 'lucide-vue-next'
+import {
+  Avatar,
+  AvatarFallback,
+  AvatarImage,
+} from './ui/avatar'
+import {
+  DropdownMenu,
+  DropdownMenuContent,
+  DropdownMenuItem,
+  DropdownMenuLabel,
+  DropdownMenuSeparator,
+  DropdownMenuTrigger,
+} from './ui/dropdown-menu'
+
+const { user, logout } = useAuth()
+
+/**
+ * Get user initials for Avatar fallback
+ * Example: "Bastian Masanek" → "BM"
+ */
+const userInitials = computed(() => {
+  if (!user.value) return '?'
+
+  const first = user.value.firstName?.charAt(0)?.toUpperCase() || ''
+  const last = user.value.lastName?.charAt(0)?.toUpperCase() || ''
+
+  return first + last || user.value.email?.charAt(0)?.toUpperCase() || '?'
+})
+
+/**
+ * Handle logout click
+ */
+async function handleLogout() {
+  try {
+    await logout()
+  } catch (error) {
+    console.error('Logout error:', error)
+  }
+}
+</script>
+
+<template>
+  <DropdownMenu>
+    <DropdownMenuTrigger as-child>
+      <button
+        class="flex items-center gap-2 rounded-full focus:outline-none focus:ring-2 focus:ring-experimenta-accent focus:ring-offset-2 focus:ring-offset-experimenta-purple transition-all hover:scale-105 hover:shadow-lg"
+        aria-label="Benutzermenü öffnen"
+      >
+        <Avatar class="h-12 w-12 border-3 border-experimenta-accent shadow-md bg-experimenta-accent">
+          <AvatarImage :src="undefined" :alt="user?.firstName" />
+          <AvatarFallback class="bg-experimenta-accent text-white font-bold text-base flex items-center justify-center w-full h-full">
+            {{ userInitials }}
+          </AvatarFallback>
+        </Avatar>
+      </button>
+    </DropdownMenuTrigger>
+
+    <DropdownMenuContent align="end" class="w-56 z-[200]">
+      <!-- User email (non-interactive) -->
+      <DropdownMenuLabel class="font-normal">
+        <div class="flex flex-col space-y-1">
+          <p class="text-sm font-medium leading-none">
+            {{ user?.firstName }} {{ user?.lastName }}
+          </p>
+          <p class="text-xs leading-none text-muted-foreground">
+            {{ user?.email }}
+          </p>
+        </div>
+      </DropdownMenuLabel>
+
+      <DropdownMenuSeparator />
+
+      <!-- Profile (disabled for now, placeholder for Phase 2+) -->
+      <DropdownMenuItem disabled>
+        <User class="mr-2 h-4 w-4" />
+        <span>Profil</span>
+      </DropdownMenuItem>
+
+      <DropdownMenuSeparator />
+
+      <!-- Logout -->
+      <DropdownMenuItem @click="handleLogout">
+        <LogOut class="mr-2 h-4 w-4" />
+        <span>Abmelden</span>
+      </DropdownMenuItem>
+    </DropdownMenuContent>
+  </DropdownMenu>
+</template>

app/components/ui/avatar/Avatar.vue

@@ -0,0 +1,22 @@
+<script setup lang="ts">
+import type { HTMLAttributes } from "vue"
+import type { AvatarVariants } from "."
+import { AvatarRoot } from "reka-ui"
+import { cn } from '~/lib/utils'
+import { avatarVariant } from "."
+
+const props = withDefaults(defineProps<{
+  class?: HTMLAttributes["class"]
+  size?: AvatarVariants["size"]
+  shape?: AvatarVariants["shape"]
+}>(), {
+  size: "sm",
+  shape: "circle",
+})
+</script>
+
+<template>
+  <AvatarRoot :class="cn(avatarVariant({ size, shape }), props.class)">
+    <slot />
+  </AvatarRoot>
+</template>

app/components/ui/avatar/AvatarFallback.vue

@@ -0,0 +1,12 @@
+<script setup lang="ts">
+import type { AvatarFallbackProps } from "reka-ui"
+import { AvatarFallback } from "reka-ui"
+
+const props = defineProps<AvatarFallbackProps>()
+</script>
+
+<template>
+  <AvatarFallback v-bind="props">
+    <slot />
+  </AvatarFallback>
+</template>

app/components/ui/avatar/AvatarImage.vue

@@ -0,0 +1,12 @@
+<script setup lang="ts">
+import type { AvatarImageProps } from "reka-ui"
+import { AvatarImage } from "reka-ui"
+
+const props = defineProps<AvatarImageProps>()
+</script>
+
+<template>
+  <AvatarImage v-bind="props" class="h-full w-full object-cover">
+    <slot />
+  </AvatarImage>
+</template>

app/components/ui/avatar/index.ts

@@ -0,0 +1,25 @@
+import type { VariantProps } from "class-variance-authority"
+import { cva } from "class-variance-authority"
+
+export { default as Avatar } from "./Avatar.vue"
+export { default as AvatarFallback } from "./AvatarFallback.vue"
+export { default as AvatarImage } from "./AvatarImage.vue"
+
+export const avatarVariant = cva(
+  "inline-flex items-center justify-center font-normal text-foreground select-none shrink-0 bg-secondary overflow-hidden",
+  {
+    variants: {
+      size: {
+        sm: "h-10 w-10 text-xs",
+        base: "h-16 w-16 text-2xl",
+        lg: "h-32 w-32 text-5xl",
+      },
+      shape: {
+        circle: "rounded-full",
+        square: "rounded-md",
+      },
+    },
+  },
+)
+
+export type AvatarVariants = VariantProps<typeof avatarVariant>

app/components/ui/dropdown-menu/DropdownMenu.vue

@@ -0,0 +1,15 @@
+<script setup lang="ts">
+import type { DropdownMenuRootEmits, DropdownMenuRootProps } from "reka-ui"
+import { DropdownMenuRoot, useForwardPropsEmits } from "reka-ui"
+
+const props = defineProps<DropdownMenuRootProps>()
+const emits = defineEmits<DropdownMenuRootEmits>()
+
+const forwarded = useForwardPropsEmits(props, emits)
+</script>
+
+<template>
+  <DropdownMenuRoot v-bind="forwarded">
+    <slot />
+  </DropdownMenuRoot>
+</template>

app/components/ui/dropdown-menu/DropdownMenuCheckboxItem.vue

@@ -0,0 +1,37 @@
+<script setup lang="ts">
+import type { DropdownMenuCheckboxItemEmits, DropdownMenuCheckboxItemProps } from "reka-ui"
+import type { HTMLAttributes } from "vue"
+import { reactiveOmit } from "@vueuse/core"
+import { Check } from "lucide-vue-next"
+import {
+  DropdownMenuCheckboxItem,
+
+  DropdownMenuItemIndicator,
+  useForwardPropsEmits,
+} from "reka-ui"
+import { cn } from '~/lib/utils'
+
+const props = defineProps<DropdownMenuCheckboxItemProps & { class?: HTMLAttributes["class"] }>()
+const emits = defineEmits<DropdownMenuCheckboxItemEmits>()
+
+const delegatedProps = reactiveOmit(props, "class")
+
+const forwarded = useForwardPropsEmits(delegatedProps, emits)
+</script>
+
+<template>
+  <DropdownMenuCheckboxItem
+    v-bind="forwarded"
+    :class=" cn(
+      'relative flex cursor-default select-none items-center rounded-sm py-1.5 pl-8 pr-2 text-sm outline-none transition-colors focus:bg-accent focus:text-accent-foreground data-[disabled]:pointer-events-none data-[disabled]:opacity-50',
+      props.class,
+    )"
+  >
+    <span class="absolute left-2 flex h-3.5 w-3.5 items-center justify-center">
+      <DropdownMenuItemIndicator>
+        <Check class="w-4 h-4" />
+      </DropdownMenuItemIndicator>
+    </span>
+    <slot />
+  </DropdownMenuCheckboxItem>
+</template>

app/components/ui/dropdown-menu/DropdownMenuContent.vue

@@ -0,0 +1,35 @@
+<script setup lang="ts">
+import type { DropdownMenuContentEmits, DropdownMenuContentProps } from "reka-ui"
+import type { HTMLAttributes } from "vue"
+import { reactiveOmit } from "@vueuse/core"
+import {
+  DropdownMenuContent,
+
+  DropdownMenuPortal,
+  useForwardPropsEmits,
+} from "reka-ui"
+import { cn } from '~/lib/utils'
+
+const props = withDefaults(
+  defineProps<DropdownMenuContentProps & { class?: HTMLAttributes["class"] }>(),
+  {
+    sideOffset: 4,
+  },
+)
+const emits = defineEmits<DropdownMenuContentEmits>()
+
+const delegatedProps = reactiveOmit(props, "class")
+
+const forwarded = useForwardPropsEmits(delegatedProps, emits)
+</script>
+
+<template>
+  <DropdownMenuPortal>
+    <DropdownMenuContent
+      v-bind="forwarded"
+      :class="cn('z-50 min-w-32 overflow-hidden rounded-md border bg-popover p-1 text-popover-foreground shadow-md data-[state=open]:animate-in data-[state=closed]:animate-out data-[state=closed]:fade-out-0 data-[state=open]:fade-in-0 data-[state=closed]:zoom-out-95 data-[state=open]:zoom-in-95 data-[side=bottom]:slide-in-from-top-2 data-[side=left]:slide-in-from-right-2 data-[side=right]:slide-in-from-left-2 data-[side=top]:slide-in-from-bottom-2', props.class)"
+    >
+      <slot />
+    </DropdownMenuContent>
+  </DropdownMenuPortal>
+</template>

app/components/ui/dropdown-menu/DropdownMenuGroup.vue

@@ -0,0 +1,12 @@
+<script setup lang="ts">
+import type { DropdownMenuGroupProps } from "reka-ui"
+import { DropdownMenuGroup } from "reka-ui"
+
+const props = defineProps<DropdownMenuGroupProps>()
+</script>
+
+<template>
+  <DropdownMenuGroup v-bind="props">
+    <slot />
+  </DropdownMenuGroup>
+</template>

app/components/ui/dropdown-menu/DropdownMenuItem.vue

@@ -0,0 +1,26 @@
+<script setup lang="ts">
+import type { DropdownMenuItemProps } from "reka-ui"
+import type { HTMLAttributes } from "vue"
+import { reactiveOmit } from "@vueuse/core"
+import { DropdownMenuItem, useForwardProps } from "reka-ui"
+import { cn } from '~/lib/utils'
+
+const props = defineProps<DropdownMenuItemProps & { class?: HTMLAttributes["class"], inset?: boolean }>()
+
+const delegatedProps = reactiveOmit(props, "class")
+
+const forwardedProps = useForwardProps(delegatedProps)
+</script>
+
+<template>
+  <DropdownMenuItem
+    v-bind="forwardedProps"
+    :class="cn(
+      'relative flex cursor-default select-none items-center rounded-sm gap-2 px-2 py-1.5 text-sm outline-none transition-colors focus:bg-accent focus:text-accent-foreground data-[disabled]:pointer-events-none data-[disabled]:opacity-50 [&>svg]:size-4 [&>svg]:shrink-0',
+      inset && 'pl-8',
+      props.class,
+    )"
+  >
+    <slot />
+  </DropdownMenuItem>
+</template>

app/components/ui/dropdown-menu/DropdownMenuLabel.vue

@@ -0,0 +1,22 @@
+<script setup lang="ts">
+import type { DropdownMenuLabelProps } from "reka-ui"
+import type { HTMLAttributes } from "vue"
+import { reactiveOmit } from "@vueuse/core"
+import { DropdownMenuLabel, useForwardProps } from "reka-ui"
+import { cn } from '~/lib/utils'
+
+const props = defineProps<DropdownMenuLabelProps & { class?: HTMLAttributes["class"], inset?: boolean }>()
+
+const delegatedProps = reactiveOmit(props, "class")
+
+const forwardedProps = useForwardProps(delegatedProps)
+</script>
+
+<template>
+  <DropdownMenuLabel
+    v-bind="forwardedProps"
+    :class="cn('px-2 py-1.5 text-sm font-semibold', inset && 'pl-8', props.class)"
+  >
+    <slot />
+  </DropdownMenuLabel>
+</template>

app/components/ui/dropdown-menu/DropdownMenuRadioGroup.vue

@@ -0,0 +1,19 @@
+<script setup lang="ts">
+import type { DropdownMenuRadioGroupEmits, DropdownMenuRadioGroupProps } from "reka-ui"
+import {
+  DropdownMenuRadioGroup,
+
+  useForwardPropsEmits,
+} from "reka-ui"
+
+const props = defineProps<DropdownMenuRadioGroupProps>()
+const emits = defineEmits<DropdownMenuRadioGroupEmits>()
+
+const forwarded = useForwardPropsEmits(props, emits)
+</script>
+
+<template>
+  <DropdownMenuRadioGroup v-bind="forwarded">
+    <slot />
+  </DropdownMenuRadioGroup>
+</template>

app/components/ui/dropdown-menu/DropdownMenuRadioItem.vue

@@ -0,0 +1,38 @@
+<script setup lang="ts">
+import type { DropdownMenuRadioItemEmits, DropdownMenuRadioItemProps } from "reka-ui"
+import type { HTMLAttributes } from "vue"
+import { reactiveOmit } from "@vueuse/core"
+import { Circle } from "lucide-vue-next"
+import {
+  DropdownMenuItemIndicator,
+  DropdownMenuRadioItem,
+
+  useForwardPropsEmits,
+} from "reka-ui"
+import { cn } from '~/lib/utils'
+
+const props = defineProps<DropdownMenuRadioItemProps & { class?: HTMLAttributes["class"] }>()
+
+const emits = defineEmits<DropdownMenuRadioItemEmits>()
+
+const delegatedProps = reactiveOmit(props, "class")
+
+const forwarded = useForwardPropsEmits(delegatedProps, emits)
+</script>
+
+<template>
+  <DropdownMenuRadioItem
+    v-bind="forwarded"
+    :class="cn(
+      'relative flex cursor-default select-none items-center rounded-sm py-1.5 pl-8 pr-2 text-sm outline-none transition-colors focus:bg-accent focus:text-accent-foreground data-[disabled]:pointer-events-none data-[disabled]:opacity-50',
+      props.class,
+    )"
+  >
+    <span class="absolute left-2 flex h-3.5 w-3.5 items-center justify-center">
+      <DropdownMenuItemIndicator>
+        <Circle class="h-2 w-2 fill-current" />
+      </DropdownMenuItemIndicator>
+    </span>
+    <slot />
+  </DropdownMenuRadioItem>
+</template>

app/components/ui/dropdown-menu/DropdownMenuSeparator.vue

@@ -0,0 +1,20 @@
+<script setup lang="ts">
+import type { DropdownMenuSeparatorProps } from "reka-ui"
+import type { HTMLAttributes } from "vue"
+import { reactiveOmit } from "@vueuse/core"
+import {
+  DropdownMenuSeparator,
+
+} from "reka-ui"
+import { cn } from '~/lib/utils'
+
+const props = defineProps<DropdownMenuSeparatorProps & {
+  class?: HTMLAttributes["class"]
+}>()
+
+const delegatedProps = reactiveOmit(props, "class")
+</script>
+
+<template>
+  <DropdownMenuSeparator v-bind="delegatedProps" :class="cn('-mx-1 my-1 h-px bg-muted', props.class)" />
+</template>

app/components/ui/dropdown-menu/DropdownMenuShortcut.vue

@@ -0,0 +1,14 @@
+<script setup lang="ts">
+import type { HTMLAttributes } from "vue"
+import { cn } from '~/lib/utils'
+
+const props = defineProps<{
+  class?: HTMLAttributes["class"]
+}>()
+</script>
+
+<template>
+  <span :class="cn('ml-auto text-xs tracking-widest opacity-60', props.class)">
+    <slot />
+  </span>
+</template>

app/components/ui/dropdown-menu/DropdownMenuSub.vue

@@ -0,0 +1,19 @@
+<script setup lang="ts">
+import type { DropdownMenuSubEmits, DropdownMenuSubProps } from "reka-ui"
+import {
+  DropdownMenuSub,
+
+  useForwardPropsEmits,
+} from "reka-ui"
+
+const props = defineProps<DropdownMenuSubProps>()
+const emits = defineEmits<DropdownMenuSubEmits>()
+
+const forwarded = useForwardPropsEmits(props, emits)
+</script>
+
+<template>
+  <DropdownMenuSub v-bind="forwarded">
+    <slot />
+  </DropdownMenuSub>
+</template>

app/components/ui/dropdown-menu/DropdownMenuSubContent.vue

@@ -0,0 +1,27 @@
+<script setup lang="ts">
+import type { DropdownMenuSubContentEmits, DropdownMenuSubContentProps } from "reka-ui"
+import type { HTMLAttributes } from "vue"
+import { reactiveOmit } from "@vueuse/core"
+import {
+  DropdownMenuSubContent,
+
+  useForwardPropsEmits,
+} from "reka-ui"
+import { cn } from '~/lib/utils'
+
+const props = defineProps<DropdownMenuSubContentProps & { class?: HTMLAttributes["class"] }>()
+const emits = defineEmits<DropdownMenuSubContentEmits>()
+
+const delegatedProps = reactiveOmit(props, "class")
+
+const forwarded = useForwardPropsEmits(delegatedProps, emits)
+</script>
+
+<template>
+  <DropdownMenuSubContent
+    v-bind="forwarded"
+    :class="cn('z-50 min-w-32 overflow-hidden rounded-md border bg-popover p-1 text-popover-foreground shadow-lg data-[state=open]:animate-in data-[state=closed]:animate-out data-[state=closed]:fade-out-0 data-[state=open]:fade-in-0 data-[state=closed]:zoom-out-95 data-[state=open]:zoom-in-95 data-[side=bottom]:slide-in-from-top-2 data-[side=left]:slide-in-from-right-2 data-[side=right]:slide-in-from-left-2 data-[side=top]:slide-in-from-bottom-2', props.class)"
+  >
+    <slot />
+  </DropdownMenuSubContent>
+</template>

app/components/ui/dropdown-menu/DropdownMenuSubTrigger.vue

@@ -0,0 +1,31 @@
+<script setup lang="ts">
+import type { DropdownMenuSubTriggerProps } from "reka-ui"
+import type { HTMLAttributes } from "vue"
+import { reactiveOmit } from "@vueuse/core"
+import { ChevronRight } from "lucide-vue-next"
+import {
+  DropdownMenuSubTrigger,
+
+  useForwardProps,
+} from "reka-ui"
+import { cn } from '~/lib/utils'
+
+const props = defineProps<DropdownMenuSubTriggerProps & { class?: HTMLAttributes["class"] }>()
+
+const delegatedProps = reactiveOmit(props, "class")
+
+const forwardedProps = useForwardProps(delegatedProps)
+</script>
+
+<template>
+  <DropdownMenuSubTrigger
+    v-bind="forwardedProps"
+    :class="cn(
+      'flex cursor-default select-none items-center rounded-sm px-2 py-1.5 text-sm outline-none focus:bg-accent data-[state=open]:bg-accent',
+      props.class,
+    )"
+  >
+    <slot />
+    <ChevronRight class="ml-auto h-4 w-4" />
+  </DropdownMenuSubTrigger>
+</template>

app/components/ui/dropdown-menu/DropdownMenuTrigger.vue

@@ -0,0 +1,14 @@
+<script setup lang="ts">
+import type { DropdownMenuTriggerProps } from "reka-ui"
+import { DropdownMenuTrigger, useForwardProps } from "reka-ui"
+
+const props = defineProps<DropdownMenuTriggerProps>()
+
+const forwardedProps = useForwardProps(props)
+</script>
+
+<template>
+  <DropdownMenuTrigger class="outline-none" v-bind="forwardedProps">
+    <slot />
+  </DropdownMenuTrigger>
+</template>

app/components/ui/dropdown-menu/index.ts

@@ -0,0 +1,16 @@
+export { default as DropdownMenu } from "./DropdownMenu.vue"
+
+export { default as DropdownMenuCheckboxItem } from "./DropdownMenuCheckboxItem.vue"
+export { default as DropdownMenuContent } from "./DropdownMenuContent.vue"
+export { default as DropdownMenuGroup } from "./DropdownMenuGroup.vue"
+export { default as DropdownMenuItem } from "./DropdownMenuItem.vue"
+export { default as DropdownMenuLabel } from "./DropdownMenuLabel.vue"
+export { default as DropdownMenuRadioGroup } from "./DropdownMenuRadioGroup.vue"
+export { default as DropdownMenuRadioItem } from "./DropdownMenuRadioItem.vue"
+export { default as DropdownMenuSeparator } from "./DropdownMenuSeparator.vue"
+export { default as DropdownMenuShortcut } from "./DropdownMenuShortcut.vue"
+export { default as DropdownMenuSub } from "./DropdownMenuSub.vue"
+export { default as DropdownMenuSubContent } from "./DropdownMenuSubContent.vue"
+export { default as DropdownMenuSubTrigger } from "./DropdownMenuSubTrigger.vue"
+export { default as DropdownMenuTrigger } from "./DropdownMenuTrigger.vue"
+export { DropdownMenuPortal } from "reka-ui"