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/user.test.ts

@@ -51,9 +51,9 @@ describe("getUserInitials", () => {
   });
 
   test("handles empty display name", () => {
-    expect(
-      getUserInitials({ displayName: "", email: "bob@example.com" }),
-    ).toBe("BO");
+    expect(getUserInitials({ displayName: "", email: "bob@example.com" })).toBe(
+      "BO",
+    );
   });
 });