Chase overdue invoices with donor history in view

**Objective:** For unpaid FreshBooks invoices due before `{due-before}` (default today), show which clients are also Bloomerang donors and how recently the organization last contacted them. FreshBooks business: `{company}` (optional).

**Step 1: Overdue invoices**

Call `freshbooks-get-invoice` (FreshBooks server) with `due-date.to` set to the cutoff and `outstanding.min` set to 0.01. Keep `invoice-number`, `organization`, `customer-id`, `outstanding`, `due-date` and `currency-code`.

**Step 2: Clients and donors**

For each distinct `customer-id`, call `freshbooks-get-client` with `id` to get the `email`. Then call `bloomerang-get-constituent` (Bloomerang server) with `primary-email` set to it. For each match, call `bloomerang-get-interaction` with `account-id` and `date.from` set to 90 days before today, and `bloomerang-get-transaction` with `account-id`.

**Step 3: Report**

A table sorted by `outstanding` descending: invoice number, client, amount outstanding, days overdue, donor yes or no, last gift date and amount, last interaction date. Mark donors clearly so a person can decide on a gentler approach. Total the outstanding amount per currency.

**Rules & Guidelines:**

* `freshbooks-get-invoice` and `freshbooks-get-client` are FreshBooks tools; `bloomerang-get-constituent`, `bloomerang-get-interaction` and `bloomerang-get-transaction` are Bloomerang tools.
* Read only. Do not send reminders (`freshbooks-send-invoice-by-email`) and do not call any add, update or delete tool on either server.

**Validation:**

* If no invoices are overdue, say so and stop.
* A client with no email cannot be matched; list it as unmatched rather than guessing.