feat: add auth and data providers with mock data hooks

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/hooks/use-follow-ups.ts

@@ -0,0 +1,42 @@
+import { useMemo } from 'react';
+
+import type { FollowUp } from '@/types/entities';
+import { useData } from '@/providers/data-provider';
+
+type UseFollowUpsResult = {
+    followUps: FollowUp[];
+    overdue: FollowUp[];
+    upcoming: FollowUp[];
+};
+
+export const useFollowUps = (): UseFollowUpsResult => {
+    const { followUps } = useData();
+
+    const now = useMemo(() => new Date(), []);
+
+    const overdue = useMemo(() => {
+        return followUps.filter((followUp) => {
+            if (followUp.followUpStatus === 'OVERDUE') {
+                return true;
+            }
+
+            if (followUp.followUpStatus === 'PENDING' && followUp.scheduledAt !== null) {
+                return new Date(followUp.scheduledAt) < now;
+            }
+
+            return false;
+        });
+    }, [followUps, now]);
+
+    const upcoming = useMemo(() => {
+        return followUps.filter((followUp) => {
+            return followUp.followUpStatus === 'PENDING' && followUp.scheduledAt !== null && new Date(followUp.scheduledAt) >= now;
+        });
+    }, [followUps, now]);
+
+    return {
+        followUps,
+        overdue,
+        upcoming,
+    };
+};