Feat/web graphs

[ppp-one]

Summary

• Add a row of three charts under the exposure time strip:
  • Transmission and system response: detector + optics, filter, atmosphere, and their product.
  • Sky radiance (log axis), with the part the detector records.
  • Star (log axis), with the part the detector records.
• The charts follow the chosen instrument, water vapour, airmass, temperature and distance.
• Add a toggle that switches all charts between the filter band and the full 0.3–3 µm range.
• Add a link that downloads all eight curves as CSV, at every 1 nm point.
• Below 1024 px, show one chart at a time, picked with tabs.
• Read the curves from the grid pickle files the page already downloads, so there is no extra download. The new source CSVs are not deployed.
• Scale the star curve to the model's star rate, so it also matches in Gaia mode.
• Remove the old System response card, renderResponse/updateResponse, and the Python function response_curves.
• Draw each chart at the width of its column, and use round tick steps on the x axis.
• Always show the model values table, without the values that repeat a control.
• Make the dark-mode --series-5 token darker (#b8891f), so it passes the palette check.
• web/build.py: use uv build when pip is missing, so uv run web/build.py works.
• Update web/README.md.

Testing

• The sky curve matches the model's sky value exactly at a grid node, and to within about 1% between nodes.
• The star scale factor is 1.000 in model mode.
• Checked in headless Chromium:
  • at 1440, 1280, 1024, 900 and 390 px, in light and dark mode;
  • all three presets, the u filter, Gaia mode and the CSV download.
• No console errors and no horizontal scroll.
• The uv wheel has the same files as the pip wheel.
• pytest: 17 passed.

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