Each slide can now carry its own Traffic Light Protocol level. When the
presentation is shared at a given TLP level, slides classified stricter
than that level are withheld, so the same deck can be shown safely to
audiences with different clearances.
- Slide.tlp field with markdown round-trip via a <!-- tlp: <key> --> marker
(also on code slides).
- Editor: a per-slide "TLP van deze slide" dropdown.
- Central rule slideVisibleAtTlp() compares levels on the TLP severity
order (none < CLEAR < GREEN < AMBER < AMBER+STRICT < RED).
- Filtering lives in _slidesForPresentationOrExport, the single source of
slides for presenting (single-window and dual-screen) and for every
export (PDF, PPTX, HTML), so all paths honour it.
- Translations for the new strings in all supported languages, plus tests
for the round-trip and the visibility rule.
flutter analyze is clean and all tests pass.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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