fix: SEO canonical URLs, LCP performance, remove unused dependencies

- Remove duplicate app/projects/ route (was causing 5xx and soft 404)
- Fix nginx: redirect www.dk0.dev → dk0.dev (non-www canonical)
- Fix not-found.tsx: locale-prefixed links, remove framer-motion dependency
- Add fetchPriority='high' and will-change to Hero LCP image
- Add preconnect hints for hardcover.app and cms.dk0.dev
- Reduce background blur from 100px to 80px (LCP rendering delay)
- Remove boneyard-js (~20 KiB), replace with custom Skeleton component
- Remove react-icons (~10 KiB), replace with inline SVGs
- Conditionally render mobile menu (saves ~20 DOM nodes)
- Add /books to sitemap
- Optimize image config with explicit deviceSizes/imageSizes

jest.config.ts

@@ -16,12 +16,11 @@ const config: Config = {
   testPathIgnorePatterns: ["/node_modules/", "/__mocks__/", "/.next/", "/e2e/"],
   // Transform react-markdown and other ESM modules
   transformIgnorePatterns: [
-    "node_modules/(?!(react-markdown|remark-.*|rehype-.*|unified|bail|is-plain-obj|trough|vfile|vfile-message|unist-.*|micromark|parse-entities|character-entities|mdast-.*|hast-.*|property-information|space-separated-tokens|comma-separated-tokens|web-namespaces|zwitch|longest-streak|ccount|boneyard-js)/)",
+    "node_modules/(?!(react-markdown|remark-.*|rehype-.*|unified|bail|is-plain-obj|trough|vfile|vfile-message|unist-.*|micromark|parse-entities|character-entities|mdast-.*|hast-.*|property-information|space-separated-tokens|comma-separated-tokens|web-namespaces|zwitch|longest-streak|ccount)/)",
   ],
   // Module name mapping to fix haste collision
   moduleNameMapper: {
     "^@/(.*)$": "<rootDir>/$1",
-    "^boneyard-js/react$": "<rootDir>/__mocks__/boneyard-js/react.tsx",
   },
   // Exclude problematic directories from haste
   modulePathIgnorePatterns: ["<rootDir>/.next/", "<rootDir>/node_modules/", "<rootDir>/e2e/"],