feat(db): mesh data model — meshes, members, invites, audit log

- pgSchema "mesh" with 4 tables isolating the peer mesh domain
- Enums: visibility, transport, tier, role
- audit_log is metadata-only (E2E encryption enforced at broker/client)
- Cascade on mesh delete, soft-delete via archivedAt/revokedAt

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

packages/shared/src/hooks/use-date-groups.ts

@@ -0,0 +1,96 @@
+import { useMemo } from "react";
+
+interface ItemWithDate {
+  createdAt: Date | string | null;
+}
+
+interface DateGroup<T> {
+  label: string;
+  items: T[];
+}
+
+const isToday = (date: Date): boolean => {
+  const today = new Date();
+  return (
+    date.getDate() === today.getDate() &&
+    date.getMonth() === today.getMonth() &&
+    date.getFullYear() === today.getFullYear()
+  );
+};
+
+const isYesterday = (date: Date): boolean => {
+  const yesterday = new Date();
+  yesterday.setDate(yesterday.getDate() - 1);
+  return (
+    date.getDate() === yesterday.getDate() &&
+    date.getMonth() === yesterday.getMonth() &&
+    date.getFullYear() === yesterday.getFullYear()
+  );
+};
+
+const isThisWeek = (date: Date): boolean => {
+  const now = new Date();
+  const weekStart = new Date(now);
+  weekStart.setDate(now.getDate() - now.getDay());
+  weekStart.setHours(0, 0, 0, 0);
+  return date >= weekStart && !isToday(date) && !isYesterday(date);
+};
+
+const isThisMonth = (date: Date): boolean => {
+  const now = new Date();
+  return (
+    date.getMonth() === now.getMonth() &&
+    date.getFullYear() === now.getFullYear() &&
+    !isThisWeek(date) &&
+    !isToday(date) &&
+    !isYesterday(date)
+  );
+};
+
+/**
+ * Groups items by date ranges: Today, Yesterday, This week, This month, Older
+ * Items must have a `createdAt` property (Date or string)
+ */
+export function useDateGroups<T extends ItemWithDate>(
+  items: T[],
+): DateGroup<T>[] {
+  return useMemo(() => {
+    const today: T[] = [];
+    const yesterday: T[] = [];
+    const thisWeek: T[] = [];
+    const thisMonth: T[] = [];
+    const older: T[] = [];
+
+    for (const item of items) {
+      if (item.createdAt === null) {
+        older.push(item);
+        continue;
+      }
+
+      const date =
+        typeof item.createdAt === "string"
+          ? new Date(item.createdAt)
+          : item.createdAt;
+
+      if (isToday(date)) {
+        today.push(item);
+      } else if (isYesterday(date)) {
+        yesterday.push(item);
+      } else if (isThisWeek(date)) {
+        thisWeek.push(item);
+      } else if (isThisMonth(date)) {
+        thisMonth.push(item);
+      } else {
+        older.push(item);
+      }
+    }
+
+    return [
+      { label: "Today", items: today },
+      { label: "Yesterday", items: yesterday },
+      { label: "This week", items: thisWeek },
+      { label: "This month", items: thisMonth },
+      { label: "Older", items: older },
+    ];
+  }, [items]);
+}