New "Grafiek" slide type rendering bar, line and pie charts.
Storage fits Marp: a ```chart fenced block holds the spec as JSON. Small
charts keep their data inline (the .md stays self-contained); data-driven
charts link an external CSV via "source": "data/<name>.csv" kept in a
separate data/ directory and packaged into .ocideck like images. On save
the inline data is stripped for linked charts (the CSV is the source of
truth); on open it is re-hydrated from the CSV.
- lib/models/chart.dart: ChartSpec/ChartSeries JSON parse/serialize,
inline-vs-source handling, and a CSV parser.
- In-app rendering (preview/presenter/PDF/PPTX) via fl_chart.
- HTML export renders charts as self-contained inline SVG generated in
Dart (no JS chart library); export inlines linked data so the page is
standalone.
- Editor: type picker, title, a CSV-style data field, and CSV import that
can inline the data or link it as data/<name>.csv (with unlink).
- Markdown round-trip + .ocideck packaging of linked CSVs; translations
for all supported languages.
flutter analyze is clean, all tests pass (new chart/CSV/round-trip tests),
and the macOS debug build compiles.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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