feat: case-study template, all pages, routing, sitemap, 404

- case-study components: CsHeader, TldrBox, MiniToc, SectionRenderer, DecisionList,
  ArchDiagram (data-driven), Gallery, NextPrev, CaseStudyPage
- standalone pages: projects index, about, experience, contact (with form),
  cv hub, colophon — all EN/NO compositions
- full route tree: EN root + /no localised slugs (prosjekter, om-meg, erfaring,
  kontakt, kolofon, hjemmelab) per ROUTING_SPEC
- bilingual 404 with trace-fray motif; robots.txt + sitemap.xml from slug map
- Portrait atom; reusable sections gain header/eyebrow toggles for standalone pages

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

site/src/i18n/dictionary.en.ts

@@ -23,6 +23,18 @@ export const en: Dictionary = {
     about: 'About',
     contact: 'Contact',
   },
+  about: {
+    languages: 'Languages',
+    interests: 'Interests',
+  },
+  cvPage: {
+    heading: 'Download my CV',
+    intro:
+      'For a full overview of my experience, skills and work history, download my CV in either language.',
+    atsNote:
+      'These are plain, ATS-friendly PDFs — single column, real text, standard headings.',
+    updated: 'Updated',
+  },
   lang: {
     switchTo: 'Switch to Norwegian',
     en: 'EN',