feat: show contacts from all logged-in accounts in Pro shell

stores/client-registry.ts

@@ -0,0 +1,23 @@
+import type { IJMAPClient } from '@/lib/jmap/client-interface';
+
+/**
+ * Tiny indirection used by the calendar and contact stores to look up a
+ * JMAP client by local account ID without importing `auth-store` directly
+ * — that would form a top-level cycle (auth-store already imports the
+ * feature stores to bootstrap them after login).
+ *
+ * `auth-store` registers its `getClientForAccount` on module init via
+ * `setClientLookup`; the feature stores call `getClientByLocalAccountId`
+ * inside their mutations.
+ */
+type ClientLookup = (localAccountId: string) => IJMAPClient | undefined;
+
+let lookup: ClientLookup | null = null;
+
+export function setClientLookup(fn: ClientLookup): void {
+  lookup = fn;
+}
+
+export function getClientByLocalAccountId(localAccountId: string): IJMAPClient | undefined {
+  return lookup ? lookup(localAccountId) : undefined;
+}