The inline PDF preview rendered only page 1, so multi-page documents
looked clipped. loadPdfInline now renders every page (capped at MAX_PAGES=20
for memory) sequentially into a scrollable .pdf-preview-body, shows the page
count in the header, and appends a "Showing the first N of M pages" notice
(pdf_truncated, 13 locales) when the PDF exceeds the cap.
Robustness: renderPage(i) attaches each canvas only AFTER its render
promise resolves, and a per-page failure is caught and skipped
(`.then(()=>renderPage(i+1)).catch(()=>renderPage(i+1))`) so one corrupt
page can't halt the preview or surface an unhandled rejection. XSS-safe
(esc(fname), t() with numeric args).
Co-authored-by: Gouranga satapathy <29521030+gourangasatapathyvit@users.noreply.github.com>