Use theme aware SVG diagrams in the chemistry QPE course

[Dhairya Patel (HABER7789)]

The chemistry course diagrams showed up as white boxes in dark themes. Nine of them are now inline SVG in the Markdown cells, so they follow whatever theme is active. They have to be inline rather than attachments, because an attachment renders as an that can't see the notebook's stylesheet.

The two orbital photos stay PNG since they are not line art, but their white background is now transparent so they work on either theme.

Addresses the diagram item in #3605.

[Copilot]

Pull request overview

Updates the Chemistry QPE course to embed diagrams as inline SVGs while retaining transparent PNGs for photographic assets.

Changes:

• Adds nine inline SVG course diagrams.
• Updates conversion logic while preserving stable cell IDs.
• Extends course verification and authoring documentation.

Reviewed changes

Copilot reviewed 4 out of 20 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
verify_course.py	Validates expected SVGs and transparent PNG attachments.
rst_to_notebook.py	Embeds local SVG assets and preserves legacy cell IDs.
README.md	Documents image authoring behavior.
tutorial_qpe_workflow.svg	Adds the QPE workflow diagram.
tutorial_qpe_wavefunction_hierarchy.svg	Adds the wavefunction hierarchy diagram.
tutorial_qpe_state_preparation_comparison.svg	Adds the state-preparation circuit comparison.
tutorial_qpe_power_one_circuit_overview.svg	Adds the IQPE circuit overview.
tutorial_qpe_phase_wrapping.svg	Adds the phase-wrapping plot.
tutorial_qpe_orbital_partition.svg	Adds the orbital partition diagram.
tutorial_qpe_orbital_entropy.svg	Adds the orbital entropy plot.
tutorial_qpe_jordan_wigner_parity.svg	Adds the Jordan–Wigner parity diagram.
tutorial_qpe_iqpe_iteration.svg	Adds the IQPE iteration flowchart.

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[Copilot]

Pull request overview

Copilot reviewed 4 out of 20 changed files in this pull request and generated no new comments.

[Andrew Casey (amcasey)]

I flicked through the themes and that looks way better