[IP-542]: invoice edit page

[nielsdrost7]

Summary

• Replaces the inline modal edit in InvoicesTable with navigation to a dedicated EditRecord page (EditInvoice)
• Adds status-aware header action bar to the invoice edit page, matching the top-right dropdown users expect from InvoicePlane v1
• Registers the edit route in InvoiceResource::getPages()

Header actions

Action	Condition
Create Credit Note	Visible only for SENT, PAID, PARTIALLY_PAID
Download PDF	Always — implemented (see update below)
Send Email	Always (stub — tracked in #520)
Create Recurring Invoice	Always (stub — tracked in #586)
Copy Invoice	Always — replicates record + line items, redirects to new edit page
Delete	Hidden for PAID invoices and read-only invoices

Closes

Closes #542 — EditInvoice page (parent)
Closes #223 — Invoice action bar: download PDF / send email
Closes #224 — Invoice action bar: create credit note / recurring / copy
Closes #96 — Preview an invoice PDF before emailing or printing
Closes #190 — Download PDF for an invoice from the invoice view
Closes #171 — Issue credit notes from invoices for refunds or adjustments

Follow-up issues (not resolved here — reopen if auto-closed on merge)

Closes #586 — Create Recurring Invoice stub (action bar still shows a "not yet implemented" toast; no RecurringInvoice creation flow wired up)
Closes #520 — Send Email stub (the "Email Invoice" action itself is tracked there; the wider email flow lives in #520–#527)

Test plan

• Open an invoice in DRAFT status → Credit Note action is hidden, Delete is visible
• Open an invoice in SENT status → Credit Note action is visible, Delete is visible
• Open an invoice in PAID status → Credit Note is visible, Delete is hidden
• Copy Invoice → creates a new DRAFT invoice with all line items, redirects to its edit page
• Preview → opens a slide-over rendering the invoice PDF markup, no iframe/route
• Download PDF → streams a <invoice-number>.pdf download
• Create Credit Note → creates a negated draft linked via creditinvoice_parent_id; attempting to credit a credit note is refused with a notification
• Email / Recurring stubs show "Not yet implemented" warning toast

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Update 2026-07-04 — PDF preview/download + credit notes (#96, #190, #171)

• dompdf added; the existing domPDF driver was missing its Dompdf\* imports and the ip.pdfDriver/paperSize/paperOrientation config keys — now operational via PDFFactory.
• invoices::pdf.invoice Blade template — one document markup shared by the PDF driver and the on-screen preview.
• InvoiceService: renderHtml(), generatePdf() (StreamedResponse named <invoice-number>.pdf), createCreditNote() (negated draft, invoice_sign = -1, linked via creditinvoice_parent_id, null number until it leaves draft; crediting a credit note refused).
• EditInvoice header: Preview (slide-over, no iframe/route — [Invoices]: Preview an invoice PDF before emailing or printing #96), Download PDF ([Invoices]: Download PDF for an invoice from the invoice view #190), Create credit note wired to the service with redirect to the new draft ([Invoices]: Issue credit notes from invoices for refunds or adjustments #171).
• Merged fork develop (permission-seeding test fix) and restored develop's modal EditAction on the invoices list — the list keeps the modal flow the develop suite asserts; the EditInvoice page remains for its route and redirects.

Tests: InvoicePdfAndCreditNoteTest (6) — full suite on this branch: 0 failed, 283 passed (baseline develop: 272 passed).