fix: correct i18n key paths for projects, featured, testimonials

- useProjects: projects.${id}.* → projectData.${id}.* (matches locale structure)
- FeaturedProjectsSection: home.projects.* → home.featuredProjects.*
- TestimonialsSection: home.testimonials.* → testimonials.*

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

app/components/sections/FeaturedProjectsSection.vue

@@ -7,8 +7,8 @@ const { featuredProjects } = useProjects()
   <section class="py-16 px-4">
     <div class="max-w-6xl mx-auto">
       <div class="text-center mb-12">
-        <h2 class="text-3xl font-bold mb-4">{{ t('home.projects.title') }}</h2>
-        <p class="text-lg text-muted max-w-2xl mx-auto">{{ t('home.projects.subtitle') }}</p>
+        <h2 class="text-3xl font-bold mb-4">{{ t('home.featuredProjects.title') }}</h2>
+        <p class="text-lg text-muted max-w-2xl mx-auto">{{ t('home.featuredProjects.subtitle') }}</p>
       </div>
       <div class="grid grid-cols-1 md:grid-cols-2 lg:grid-cols-3 gap-8">
         <ProjectCard