[IP-160]: convert a quote to a draft invoice

[nielsdrost7]

Addresses #160 (kept open per workflow — PRs stay draft).

What

• QuoteService::convertQuoteToInvoice(Quote): Invoice — inside a transaction: copies prospect_id → customer_id, all quote items (name, qty, price, discounts, both tax rates, task link), the discount/tax/total summary, and summary/terms/footer onto a new draft invoice; then sets the quote to the new QuoteStatus::CONVERTED case.
• The draft is created with a null invoice number — consistent with the duplicate-prevention observer (PR [IP-513]: duplicate-number prevention via Observers #540) that allows multiple nulls for drafts; numbering is assigned when the invoice leaves draft.
• Converting twice throws and is surfaced as a danger notification; the convert_to_invoice table action (existing stub, now wired) hides for already-converted quotes and requires confirmation.

Deviation from the SMART plan: no redirect to EditInvoice — that page only exists on PR #544's branch. Trivial follow-up once #544 lands.

Tests

QuoteConversionTest — 3 tests: full conversion (items, totals, status), double-conversion rejection, action visibility.

Note: upstream CI fails at job startup on every branch — validated locally; Quotes+Invoices suites match the develop baseline exactly plus the new passing tests.

🤖 Generated with Claude Code

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