✨(frontend) add pdf outline property to enable bookmarks display

[Ovgodd]

Purpose

This pull request introduces PDF bookmarks (outline) support in exported documents.
The goal is to provide an accessible outline structure based on document headings, in line with WCAG/RGAA requirements for navigable documents.

issue 1335

Proposal

• Add bookmark attributes to exported headings in the PDF renderer.
• Enable outlines by setting pageMode="useOutlines" so that bookmarks are visible in PDF readers.
• Ensure each heading (h1, h2, h3, …) is represented in the outline structure.
• Known limitation: although the outline is displayed correctly in Acrobat Reader and Firefox PDF Viewer, clicking on bookmarks does not reliably scroll to the correct heading

Investigations performed

• Tried attaching unique id values to headings.
• Tested with invisible anchors positioned before headings.
• Experimented with top, left, and fit options on bookmarks.
• Tried assigning explicit destination values (dest).

👉 In all cases, the behavior remains the same: all bookmarks on a given page point to the same destination (the last heading).

In my opinion the issue seems to be a limitation/bug in @react-pdf/renderer v4: bookmarks are generated in the outline but do not create unique destinations per heading.

[github-actions]

Size Change: +70 B (0%)

Total Size: 3.66 MB

Filename	Size	Change
apps/impress/out/_next/static/bd3598a5/_buildManifest.js	0 B	-888 B (removed)	🏆
apps/impress/out/_next/static/fdfd8ce6/_buildManifest.js	889 B	+889 B (new file)	🆕

_{compressed-size-action}

[AntoLC]

✅ !