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/format-date.test.ts

@@ -100,7 +100,9 @@ describe("formatRelativeDate", () => {
   test("returns formatted date for older dates in same year", () => {
     // Use a "now" later in the year to test same-year formatting
     const laterNow = new Date("2024-06-15T12:00:00Z");
-    const result = formatRelativeDate("2024-01-15T12:00:00Z", { now: laterNow });
+    const result = formatRelativeDate("2024-01-15T12:00:00Z", {
+      now: laterNow,
+    });
     expect(result).toBe("Jan 15");
   });