✨ Add project detail page with prev/next navigation (Story 2.3)

- Enhance ProjectController show() with prev/next navigation data
- Create useFetchProject composable with ProjectNavigation type
- Implement [slug].vue with full project details:
  - Hero image, title with featured badge, formatted date
  - Description, external links (site/GitHub)
  - Skills grid with level progression (before → after)
  - Prev/next navigation with project titles
  - 404 state with spider narrator
- Add dynamic SEO meta tags with og:image from project
- Responsive design: stacked mobile, grid desktop

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

frontend/app/composables/useFetchProject.ts

@@ -0,0 +1,33 @@
+import type { Project } from '~/types/project'
+
+export interface ProjectNavigation {
+  prev: { slug: string; title: string } | null
+  next: { slug: string; title: string } | null
+}
+
+interface ProjectResponse {
+  data: Project
+  meta: { lang: string }
+  navigation: ProjectNavigation
+}
+
+interface ProjectError {
+  error: {
+    code: string
+    message: string
+  }
+}
+
+export function useFetchProject(slug: string | Ref<string>) {
+  const config = useRuntimeConfig()
+  const { locale } = useI18n()
+  const slugValue = toValue(slug)
+
+  return useFetch<ProjectResponse, ProjectError>(`/projects/${slugValue}`, {
+    baseURL: config.public.apiUrl as string,
+    headers: {
+      'X-API-Key': config.public.apiKey as string,
+      'Accept-Language': locale.value,
+    },
+  })
+}

frontend/app/pages/projets/[slug].vue

@@ -1,19 +1,205 @@
 <template>
-  <div class="min-h-screen p-8">
-    <h1 class="text-3xl font-narrative text-sky-text">{{ slug }}</h1>
-    <p class="mt-4 text-sky-text/70">{{ $t('pages.projects.description') }}</p>
+  <div class="max-w-5xl mx-auto px-4 py-8 md:py-12">
+    <!-- Loading state -->
+    <div v-if="pending" class="animate-pulse">
+      <div class="bg-sky-text/5 rounded-xl h-64 md:h-96 mb-8" />
+      <div class="bg-sky-text/5 h-10 rounded w-2/3 mb-4" />
+      <div class="bg-sky-text/5 h-5 rounded w-1/4 mb-8" />
+      <div class="space-y-3">
+        <div class="bg-sky-text/5 h-4 rounded w-full" />
+        <div class="bg-sky-text/5 h-4 rounded w-full" />
+        <div class="bg-sky-text/5 h-4 rounded w-3/4" />
+      </div>
+    </div>
+
+    <!-- Error 404 -->
+    <div v-else-if="error" class="text-center py-16">
+      <div class="text-6xl mb-6">🕷️</div>
+      <h1 class="text-2xl font-ui font-bold text-sky-text mb-4">
+        {{ $t('projects.not_found') }}
+      </h1>
+      <p class="text-sky-text/60 font-narrative mb-8 max-w-md mx-auto">
+        {{ $t('projects.not_found_description') }}
+      </p>
+      <NuxtLink
+        :to="localePath('/projets')"
+        class="inline-flex items-center px-6 py-3 bg-sky-accent text-sky-dark font-ui font-semibold rounded-lg hover:opacity-90 transition-opacity"
+      >
+        {{ $t('projects.back_to_gallery') }}
+      </NuxtLink>
+    </div>
+
+    <!-- Project content -->
+    <article v-else-if="project">
+      <!-- Back link -->
+      <NuxtLink
+        :to="localePath('/projets')"
+        class="inline-flex items-center gap-2 text-sky-text/60 hover:text-sky-accent font-ui text-sm mb-6 transition-colors"
+      >
+        <span>←</span>
+        {{ $t('projects.back_to_gallery') }}
+      </NuxtLink>
+
+      <!-- Main image -->
+      <div class="mb-8 rounded-xl overflow-hidden">
+        <NuxtImg
+          :src="project.image"
+          :alt="project.title"
+          format="webp"
+          class="w-full h-auto max-h-[500px] object-cover"
+          loading="eager"
+        />
+      </div>
+
+      <!-- Header: title, date, featured badge -->
+      <header class="mb-8">
+        <div class="flex items-start gap-3 mb-3">
+          <h1 class="text-3xl md:text-4xl font-ui font-bold text-sky-text">
+            {{ project.title }}
+          </h1>
+          <span
+            v-if="project.is_featured"
+            class="shrink-0 mt-1 px-3 py-1 bg-sky-accent/20 text-sky-accent text-xs font-ui font-semibold rounded-full"
+          >
+            ⭐ Featured
+          </span>
+        </div>
+        <p v-if="project.date_completed" class="text-sky-text/60 font-ui">
+          {{ $t('projects.completed_on') }}
+          {{ formatDate(project.date_completed) }}
+        </p>
+      </header>
+
+      <!-- Description -->
+      <div class="mb-10">
+        <p class="text-sky-text font-narrative text-lg leading-relaxed whitespace-pre-line">
+          {{ project.description }}
+        </p>
+      </div>
+
+      <!-- External links -->
+      <div v-if="project.url || project.github_url" class="flex flex-wrap gap-4 mb-10">
+        <a
+          v-if="project.url"
+          :href="project.url"
+          target="_blank"
+          rel="noopener noreferrer"
+          class="inline-flex items-center gap-2 px-6 py-3 bg-sky-accent text-sky-dark font-ui font-semibold rounded-lg hover:opacity-90 transition-opacity"
+        >
+          🌐 {{ $t('projects.visit_site') }}
+        </a>
+        <a
+          v-if="project.github_url"
+          :href="project.github_url"
+          target="_blank"
+          rel="noopener noreferrer"
+          class="inline-flex items-center gap-2 px-6 py-3 bg-sky-text/10 text-sky-text font-ui font-semibold rounded-lg hover:bg-sky-text/20 transition-colors border border-sky-text/10"
+        >
+          💻 {{ $t('projects.view_code') }}
+        </a>
+      </div>
+
+      <!-- Skills used -->
+      <section v-if="project.skills && project.skills.length > 0" class="mb-12">
+        <h2 class="text-xl font-ui font-semibold text-sky-text mb-6">
+          {{ $t('projects.skills_used') }}
+        </h2>
+        <div class="grid grid-cols-1 sm:grid-cols-2 lg:grid-cols-3 gap-4">
+          <div
+            v-for="skill in project.skills"
+            :key="skill.id"
+            class="bg-sky-text/5 rounded-lg p-4 border border-sky-text/10"
+          >
+            <div class="flex items-center gap-2 mb-2">
+              <span v-if="skill.icon" class="text-xl">{{ skill.icon }}</span>
+              <span class="font-ui font-medium text-sky-text">{{ skill.name }}</span>
+            </div>
+            <div v-if="skill.pivot" class="text-sm text-sky-text/60 font-ui">
+              {{ $t('projects.skill_level') }}:
+              <span class="text-sky-accent">{{ skill.pivot.level_before }}</span>
+              →
+              <span class="text-sky-accent font-semibold">{{ skill.pivot.level_after }}</span>
+            </div>
+          </div>
+        </div>
+      </section>
+
+      <!-- Prev/Next navigation -->
+      <nav class="flex justify-between items-stretch gap-4 border-t border-sky-text/10 pt-8 mt-8">
+        <NuxtLink
+          v-if="navigation?.prev"
+          :to="localePath(`/projets/${navigation.prev.slug}`)"
+          class="flex-1 max-w-[45%] group p-4 rounded-lg hover:bg-sky-text/5 transition-colors text-left"
+        >
+          <span class="block text-sm text-sky-text/40 font-ui mb-1">
+            {{ $t('projects.previous') }}
+          </span>
+          <span class="block text-sky-text font-ui font-medium group-hover:text-sky-accent transition-colors truncate">
+            ← {{ navigation.prev.title }}
+          </span>
+        </NuxtLink>
+        <div v-else class="flex-1" />
+
+        <NuxtLink
+          v-if="navigation?.next"
+          :to="localePath(`/projets/${navigation.next.slug}`)"
+          class="flex-1 max-w-[45%] group p-4 rounded-lg hover:bg-sky-text/5 transition-colors text-right"
+        >
+          <span class="block text-sm text-sky-text/40 font-ui mb-1">
+            {{ $t('projects.next') }}
+          </span>
+          <span class="block text-sky-text font-ui font-medium group-hover:text-sky-accent transition-colors truncate">
+            {{ navigation.next.title }} →
+          </span>
+        </NuxtLink>
+        <div v-else class="flex-1" />
+      </nav>
+    </article>
   </div>
 </template>
 
 <script setup lang="ts">
+import { useProgressionStore } from '~/stores/progression'
+
 const route = useRoute()
-const slug = computed(() => route.params.slug as string)
-
+const { t, locale } = useI18n()
+const localePath = useLocalePath()
 const { setPageMeta } = useSeo()
-const { t } = useI18n()
+const store = useProgressionStore()
 
-setPageMeta({
-  title: slug.value,
-  description: t('pages.projects.description'),
+const slug = computed(() => route.params.slug as string)
+const { data, pending, error } = await useFetchProject(slug.value)
+
+const project = computed(() => data.value?.data)
+const navigation = computed(() => data.value?.navigation)
+
+// Date formatting
+const formatDate = (dateStr: string) => {
+  const date = new Date(dateStr)
+  return new Intl.DateTimeFormat(locale.value === 'fr' ? 'fr-FR' : 'en-US', {
+    year: 'numeric',
+    month: 'long',
+    day: 'numeric',
+  }).format(date)
+}
+
+// SEO - reactive to project data
+watchEffect(() => {
+  if (project.value) {
+    setPageMeta({
+      title: `${project.value.title} | Skycel`,
+      description: project.value.short_description || project.value.description?.slice(0, 160),
+      image: project.value.image,
+    })
+  } else if (error.value) {
+    setPageMeta({
+      title: t('projects.not_found'),
+      description: t('projects.not_found_description'),
+    })
+  }
+})
+
+onMounted(() => {
+  store.visitSection('projets')
 })
 </script>

frontend/i18n/en.json

@@ -82,7 +82,17 @@
     "discover": "Discover",
     "no_projects": "No projects yet",
     "load_error": "Unable to load projects...",
-    "view_all": "View all projects"
+    "view_all": "View all projects",
+    "not_found": "Project not found",
+    "not_found_description": "This project doesn't exist or has been removed.",
+    "back_to_gallery": "Back to gallery",
+    "completed_on": "Completed on",
+    "visit_site": "Visit site",
+    "view_code": "View code",
+    "skills_used": "Skills used",
+    "skill_level": "Level",
+    "previous": "Previous project",
+    "next": "Next project"
   },
   "pages": {
     "projects": {

frontend/i18n/fr.json

@@ -82,7 +82,17 @@
     "discover": "D\u00e9couvrir",
     "no_projects": "Aucun projet pour le moment",
     "load_error": "Impossible de charger les projets...",
-    "view_all": "Voir tous les projets"
+    "view_all": "Voir tous les projets",
+    "not_found": "Projet introuvable",
+    "not_found_description": "Ce projet n'existe pas ou a \u00e9t\u00e9 supprim\u00e9.",
+    "back_to_gallery": "Retour \u00e0 la galerie",
+    "completed_on": "R\u00e9alis\u00e9 le",
+    "visit_site": "Voir le site",
+    "view_code": "Voir le code",
+    "skills_used": "Comp\u00e9tences utilis\u00e9es",
+    "skill_level": "Niveau",
+    "previous": "Projet pr\u00e9c\u00e9dent",
+    "next": "Projet suivant"
   },
   "pages": {
     "projects": {