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/utils/greeting.ts

@@ -0,0 +1,25 @@
+export type GreetingKey = "morning" | "afternoon" | "evening" | "night";
+
+interface Greeting {
+  text: GreetingKey;
+  emoji: string;
+}
+
+/**
+ * Returns a time-appropriate greeting key with matching emoji
+ * The text property is an i18n key to be used with t("greeting.{key}")
+ */
+export function getGreeting(): Greeting {
+  const hour = new Date().getHours();
+
+  if (hour >= 5 && hour < 12) {
+    return { text: "morning", emoji: "🌅" };
+  }
+  if (hour >= 12 && hour < 17) {
+    return { text: "afternoon", emoji: "☀️" };
+  }
+  if (hour >= 17 && hour < 21) {
+    return { text: "evening", emoji: "🌆" };
+  }
+  return { text: "night", emoji: "🌙" };
+}