The Export context-menu offered only md↔docx↔html (a symmetric set), so PDF
— which the server supports only as md→pdf — was missing. The markdown
editor's DOCX/HTML/PDF buttons hardcoded their own list, so the two could
drift.
Introduce a single source of truth in download.js: EXPORT_MATRIX mirrors
zddc/internal/convert.Convert() exactly (md→docx|html|pdf, docx→md|html,
html→md|docx), exposed as download.exportTargets(ext) + download.convertUrl().
The Export submenu and the editor's buttons both consume it, so a .md file now
offers PDF in the menu and the two surfaces can never disagree. PDF stays
markdown-only (no docx→pdf / html→pdf path exists server-side).
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
ZDDC
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