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Covers the features the docs did not show yet.

Docs

• Importing Matplotlib figures (tutorial_18_matplotlib_import.ipynb): Canvas.from_matplotlib on a two-panel figure, import_report, why Plotly refuses a native colour bar and how fallback="raster" helps, importing one Axes and drawing it as TikZ, strict=True and trusted=True.
• TikZ diagrams (tutorial_19_tikz_diagrams.ipynb): canvas.add_tikzfigure() with nodes and paths; what the Matplotlib drawing shows (shapes, colours, text, lines), the diagram's own TikZ (arrow tips and all TikZ options), and which backends draw diagrams.
• Plotly tutorial: a section on include_plotlyjs (bundled, "cdn", False, with the file sizes) and to_html(full_html=False) for embedding.

Fixes

• A canvas with a add_tikzfigure panel crashed the Plotly backend with AttributeError: 'TikzFigure' object has no attribute '_secondary_xaxis_settings'. It now raises NotImplementedError, as the plotext backend already did; with a test.
• The docs smoke test looked for tutorials/tutorial-07-tikz/1.png, which has failed on devel since 2 November. A notebook's outputs are numbered in order, and in CI the Plotly preview of tutorial 07 is 1.html, so the first compiled TikZ figure is 2.png (the CI build reports 6 assets for tutorial 07: one HTML and five images).

Checks

• All four changed notebooks execute and convert with starlight-notebooks convert --strict; the site builds locally with the link check, and tutorials/tutorial-07-tikz/2.png is in dist.
• 331 tests pass; the pre-commit hooks pass.