Fix cloud SessionStart hook interpreter; theme-aware Plotly axis lines

[NCCU-Schultz-Lab]

Summary

Two small fixes ahead of the 0.9.0 bump.

• Cloud SessionStart hook: fixed pip vs python interpreter mismatch (.claude/hooks/session-start.sh)
  • The hook upgraded setuptools with python -m pip, then installed the package with bare pip.
  • In the cloud image, pip is /usr/bin/pip (the distro Python) while python is /usr/local/bin/python, so the install used the distro's setuptools.
  • That build failed on pyscf-properties, and because the hook runs with set -e, the session ended up with nothing installed.
  • This is the cause of the "pyscf-properties uninstallable in cloud" watchlist item, which was previously treated as an environment limitation.
  • Fix: python -m pip install -e ".[pyscf,ase,dev,xtb]".
• Plotly axis and zero lines now follow the theme (quantui/app.py, quantui/theme.py)
  • _apply_plotly_theme() set background, font and grid colors, but left linecolor/zerolinecolor at the plotly_white template's pale default.
  • Both now use the palette's border_strong, exposed as the new plotly_colors()["axis_line_color"]. That is one step stronger than the grid color, so axes stay visible on dark palettes.
  • This is the last open code item in M-THEME.

Testing

• Hook: uninstalled pyscf-properties, then ran the fixed hook with CLAUDE_CODE_REMOTE=true. It reinstalled the package (Successfully installed pyscf-properties-0.1.0) and exited 0.
• Suite: full pytest -m "not network" in the cloud container: 3432 passed, 0 failed, 11 skipped. The 23 NMR/Raman failures noted in SLURM job folders with per-attempt subfolders; SLURM results marked in History #127 are gone.
• Theme test: test_plotly_colours_track_palette now also asserts axis_line_color for every palette.
• Lint: pre-commit run (ruff + black) is clean.
• Not yet checked: how the axis lines look on a dark palette in Voilà. That visual pass is owed locally.

Authorship

• Claude (Opus 5.5): code edits, review, and conceptual discussion
• Jonathan Schultz: overall vision, planning, review, and orchestration

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