Mirror Stripe invoices in Business Central as checked drafts

**Objective:** Create an unposted sales invoice in Business Central company `{company}` (default: the default company) that mirrors Stripe invoice `{stripe-invoice}` (an in_ id or an invoice number), with each Stripe line posted to G/L account `{revenue-account-number}`.

**Step 1: Read the Stripe invoice**

Call `stripe-get-invoice` with `invoice-id` set to `{stripe-invoice}` if it starts with in_, otherwise with `number`. If its status is draft or void, report that and stop. Keep `invoice-id`, `number`, `customer-email`, `customer-name`, `total`, `currency`, `created-date` and `due-date`.

**Step 2: Check it is not already in Business Central**

Call `business-central-get-posted-sales-invoice` with `external-document-number` set to the Stripe `number`, then `business-central-get-sales-transaction` with the same `external-document-number`. If either returns a document, report it and stop.

**Step 3: Find the Business Central customer**

Call `business-central-get-customer` with `email` set to the Stripe `customer-email`. If there is no match, stop and tell the user to run the create-bc-customer-from-stripe prompt first. If more than one matches, list them and ask which to use.

**Step 4: Read the lines and propose the invoice**

Call `stripe-get-invoice-item` with `invoice-id`. For each line, plan a G/L account line with `number-on-line` set to `{revenue-account-number}`, `description` set to the Stripe description, `quantity` set to the Stripe quantity (1 if empty) and `unit-price` set to the Stripe amount divided by that quantity. Use the `line-type` value for a G/L account that the tool's schema lists.

Show the user the header (customer-number, external-document-number set to the Stripe number, invoice-date set to the Stripe created-date, due-date) and the planned lines, with their total against the Stripe total. Ask the user to confirm. Do not continue without a clear yes.

**Step 5: Create**

Call `business-central-create-sales-invoice` once, with `customer-number` and `bill-to-customer-number` both set to the customer's number, `external-document-number`, `invoice-date` and `due-date`. Then call `business-central-create-sales-invoice-line` once per planned line with `document-id` set to the returned `id`.

**Step 6: Verify**

Call `business-central-get-sales-transaction` with `external-document-number` set to the Stripe number and compare `total-amount-including-tax` with the Stripe `total`. Report the new Business Central invoice number, both totals and any difference. A difference usually means Business Central calculated tax differently from Stripe; say so rather than changing the lines.

**Rules & Guidelines:**

* `stripe-get-invoice` and `stripe-get-invoice-item` are on the stripe server; every tool whose name starts with business-central is on the business-central server.
* The only writes allowed are one `business-central-create-sales-invoice` and one `business-central-create-sales-invoice-line` per Stripe line, only after confirmation in Step 4.
* Do NOT call `business-central-update-sales-invoice`, `business-central-update-sales-invoice-line` or `business-central-create-customer`. The invoice is left unposted for the user to review and post in Business Central.
* Nothing is written to Stripe.

**Validation:**

* If a line create fails partway through, stop, report the Business Central invoice number and which lines were created, and tell the user to finish or delete the draft in Business Central. Do not retry automatically.
* If the Stripe currency differs from the company's local currency, ask the user whether to pass it in upper case as `currency-code` before creating the header.
* If the invoice has no lines, stop and report it.