Add type-safe navigation helpers and public pages

- Create gotoLogin() helper for login redirects with search params
- Add /terms and /privacy public routes with Tailwind typography
- Update auth-guard to allow unauthenticated access to public pages
- Fix resolve() usage across navigation components using as const pattern
- Fix eslint-disable-next-line placement for svelte/no-navigation-without-resolve
- Document SvelteKit resolve() patterns in CLAUDE.md

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

packages/common/src/index.ts

@@ -1,9 +1,9 @@
 export {
+  type FormatRelativeDateOptions,
   formatDate,
   formatDateTime,
   formatLongDate,
   formatRelativeDate,
   formatRelativeTime,
-  type FormatRelativeDateOptions,
 } from "./format-date.js";
 export { formatRole, getUserInitials } from "./user.js";