Release v0.3.0 — Reworked PDF export and DOCX export

The PDF export is rebuilt from scratch around a live preview dialog with full control over fonts, margins, colors, headers and footers, watermarks, and page numbering. A new DOCX export ships alongside it, and tables of contents and footnotes become clickable jumps in the exported PDF.

Features

• Open a live PDF preview with a sidebar of settings — every change shows up in the preview before you print.
• Pick from 21 named system fonts (serif/sans/mono groups) for body and headings independently, with each option rendered in its own typeface in the dropdown.
• Adjust margins per side with four independent sliders (top, right, bottom, left), or pick a preset.
• Customize accent color and table-header background.
• Add a page header and footer with three slots each (left/center/right) and template variables {title}, {date}, {path}, {page}, {pages}.
• Show page numbers in three formats (1, 1/12, Page 1 of 12) and start numbering from any page.
• Drop a watermark behind the page — custom text, color, opacity, rotation, and size.
• Save and reuse named presets (three built-ins included: Corporate Report, Notes, Draft with watermark), with the last-used settings remembered.
• Auto-generate a clickable Table of Contents with selectable heading depth (H1 through H1–H6). Footnote references jump to definitions in the PDF and back-arrows return you to the reference.
• Export to DOCX from the toolbar (Word-compatible).
• Translate the entire PDF dialog and TOC labels to English, Polish, and Chinese.

Bug fixes

• Fix Mermaid diagrams rendering as a solid black pill in the exported PDF (the serializer was picking up the toolbar icon SVG instead of the diagram).
• Fix dark-themed Mermaid diagrams losing their text in print — text is converted to native SVG so labels survive and dark backgrounds become white for readability.
• Fix the live preview not refreshing when settings changed — preview now updates as you tweak fonts, margins, header/footer, and watermark.
• Fix Mermaid diagrams clipping wrapped node labels and triggering huge empty pages in PDF — diagrams now fit on a single page and labels are no longer cut off.
• Fix Vite dev server crashing with "too many open files" by restricting dependency scanning.

UI/UX

• Reorganize the PDF dialog into tabs (Layout / Typography / Header & Footer / TOC / Watermark) for quicker access.
• Show a font sample under each font picker so you can see what you're choosing.
• Keep headings together with their first paragraph in PDF (no more orphan headings at the bottom of a page).
• Replace native print checkboxes with crisp Unicode glyphs (☑ / ☐) in task lists.