[Reports]: PDF export for tabular report pages

[nielsdrost7]

v1 rendered every report as a PDF (pdf_create() via mPDF — application/modules/reports/controllers/Reports.php:38-42 and equivalents for all five reports). v2's tabular reports (#145 / PR #609) ship with CSV export only. #145's status note explicitly defers "print/PDF export of these reports through builder templates" to "a separate issue once #130 Phase 3 (ReportRenderer) lands" — this is that issue.

---

Specific

Add a Download PDF header action to each tabular report page (Payment History, Invoicing History, Invoiced Amount by Client, Sales by Date, Invoices per Client, and Invoice Aging when it exists) producing a print-ready A4 PDF: report title, company name, selected date range/filters, the table, and the totals line.

Measurable

• Every report page shows Download PDF next to Export CSV.
• The PDF contains the same rows and totals as the on-screen table for the active filters.
• Long reports paginate with repeated column headers per page.
• Filename pattern: <report-slug>-<from>-<to>.pdf.

Achievable

Consume the Report Builder rendering pipeline (#130 Phase 3 ReportRenderer / Browsershot driver from PR #608) with a default tabular template; fall back to a simple Blade→Browsershot render if the builder integration is not ready. No new packages.

Relevant

v1 parity (v1 reports were PDF-first) and the stated follow-up of epic #506 Track B.

Time-Bound

One sprint after both #609 (report pages) and #608 Phase 3 (renderer) merge.

---

Arrange

• Company with 3 payments inside a chosen date range and 1 outside it.
• Payment History report filtered to that range.

Act

• Trigger Download PDF.

Assert

• Response is a PDF download with the expected filename.
• PDF text contains the 3 in-range payments and the totals value; the out-of-range payment is absent.
• Company name and date range appear in the header.
• Works for all report pages (smoke test per page).
• PHPUnit feature tests assert the download response + content type; content assertions via PDF text extraction or the intermediate HTML.