feat(clerk): add clerk-facing Cheque Book screen and shell nav wiring

Adds a customer-account-scoped Cheque Book view under Clerk > Account
Facilities (list + leaf detail, with stop-payment/report-lost/mark-used/
return actions), reachable via a new hover dropdown on the Account
Facilities nav item. Also refreshes the Account Facilities page layout,
and carries over a few chequebook service/detail-dialog fixes from the
back-office module (used-leaf display, leaf-lookup dialog polish).

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

src/assets/translations/en-US.json

@@ -362,6 +362,7 @@
       "Revoke Stop Payment": "Revoke Stop Payment",
       "Cancel Leaf": "Cancel Leaf",
       "Mark as Used": "Mark as Used",
+      "Flag Returned": "Flag Returned",
       "Activate": "Activate",
       "Activate Self Service User": "Activate Self Service User",
       "Add": "Add",
@@ -1524,6 +1525,7 @@
       "Lost Reason": "Lost Reason",
       "Cancelled Reason": "Cancelled Reason",
       "Used Reason": "Used Reason",
+      "Return Reason": "Return Reason",
       "Issue Date": "Issue Date",
       "ACCOUNTING": "ACCOUNTING",
       "ADDRESS": "ADDRESS",