feat(perf): implement route lazy loading for About and Contact pages

- Splits About and Contact pages into separate chunks using React.lazy and Suspense.
- Keeps Home page eager loaded to prevent layout shifts.
- Adds PageLoader component as a fallback for Suspense.
- Reduces initial bundle size by loading secondary pages only when needed.

.jules/bolt.md

@@ -1,3 +1,7 @@
 ## 2024-05-22 - Missing Scripts and Environment
 **Learning:** The project lacks `lint` script in `package.json`. Running `pnpm lint` might invoke system tools (like Android Lint?) instead of failing or doing nothing useful. Always check `package.json` scripts first.
 **Action:** Use specific commands like `pnpm exec tsc --noEmit` or `npx vitest` as discovered/documented, rather than assuming standard scripts exist.
+
+## 2025-01-26 - Missing Node Modules
+**Learning:** The environment might lack `node_modules` completely, preventing `npx vitest` or `pnpm exec tsc` from running even if dependencies are listed in `package.json`. Network restrictions may prevent `pnpm install`.
+**Action:** When `node_modules` is missing and cannot be installed, rely on static analysis, careful code review, and verifying file contents manually. Do not assume tests can run.