refactor: enhance onboarding logic and update default redirect path

frontend/src/lib/onboarding.test.ts

@@ -0,0 +1,47 @@
+import { describe, expect, it } from "vitest";
+
+import { isOnboardingComplete } from "@/lib/onboarding";
+
+describe("isOnboardingComplete", () => {
+  it("returns false when profile is missing", () => {
+    expect(isOnboardingComplete(null)).toBe(false);
+    expect(isOnboardingComplete(undefined)).toBe(false);
+  });
+
+  it("returns false when timezone is missing", () => {
+    expect(
+      isOnboardingComplete({
+        preferred_name: "Asha",
+        timezone: "",
+      }),
+    ).toBe(false);
+  });
+
+  it("returns false when both name fields are missing", () => {
+    expect(
+      isOnboardingComplete({
+        name: "   ",
+        preferred_name: "   ",
+        timezone: "America/New_York",
+      }),
+    ).toBe(false);
+  });
+
+  it("accepts preferred_name + timezone", () => {
+    expect(
+      isOnboardingComplete({
+        preferred_name: "Asha",
+        timezone: "America/New_York",
+      }),
+    ).toBe(true);
+  });
+
+  it("accepts fallback name + timezone", () => {
+    expect(
+      isOnboardingComplete({
+        name: "Asha",
+        timezone: "America/New_York",
+      }),
+    ).toBe(true);
+  });
+});

frontend/src/lib/onboarding.ts

@@ -0,0 +1,13 @@
+type OnboardingProfileLike = {
+  name?: string | null;
+  preferred_name?: string | null;
+  timezone?: string | null;
+};
+
+export function isOnboardingComplete(
+  profile: OnboardingProfileLike | null | undefined,
+): boolean {
+  if (!profile) return false;
+  const resolvedName = profile.preferred_name?.trim() || profile.name?.trim();
+  return Boolean(resolvedName) && Boolean(profile.timezone?.trim());
+}