[jqnatividad]

Stacked on #4838 (the plotly.rs pin bump that exposes the new plotly.js 3.7 traces). Retarget to master once #4838 merges.

What's new

• viz parcoords: parallel coordinates, one line per row across the numeric --cols (default: all numeric, minus near-unique integer IDs).
  • --color <col> colors the lines through Viridis, with a colorbar. The color column doesn't have to be one of the axes. The default is the first axis.
  • Rows are stride-sampled to the QSV_VIZ_MAX_POINTS budget, with a "(sampled)" title cue. --size is rejected with a usage error.
• viz smart parallel-coordinates panel (HTML-only, like parcats):
  • When: it appears when 3+ measures each correlate with another at |r| ≥ 0.3.
  • Data: it's built from the columns and matrix already read for the correlation heatmap, so there's no extra data pass.
  • Layout: up to 6 axes, chained greedily so neighboring axes are the strongest pairs (the only pairs parallel coordinates lets you read). Lines are colored by the strongest pair's first member.
  • Size: capped at 5,000 lines, because the panel is plain JSON (not gzip'd or typed-array encoded).
  • Tour token @parcoords.
  • On by default, with an opt-out: --no-parcoords leaves it out. The auto --max-charts 0 ceiling (MAX_PANELS_INLINE) goes from 64 to 65, so the panel doesn't push a per-column chart out of a wide Data Schematic. An explicit --max-charts N is unchanged: the panel competes for those N slots like the other overview panels.
• i18n: viz.title.parcoords, viz.title.parcoords_dims and viz.tour.explain.parcoords in all 8 locales.
• Regenerated docs/help/viz.md and qsv-viz.json (new subcommand enum entry plus an example).

Gallery: WebGL context budget (separate commit, 8b87bec)

Parcoords is a WebGL trace and uses 3 contexts. Chrome keeps ~16 live WebGL contexts per page (same-origin iframes share the budget) and silently drops the oldest, leaving those plots permanently blank.

The gallery on master already needs ~38 once its 17 lazy iframes load, so this was a latent problem. Parcoords made it visible at first paint: splom, scatter3d and the maps went blank.

gen_gallery.py now does two things:

• Figures with WebGL traces render only within a viewport of the screen and are Plotly.purged when they scroll away, with their height pinned.
• Data Schematic iframes swap to about:blank off-screen.

SVG figures stay eager. Verified in Chrome: scrolling top → bottom → back re-renders splom, scatter3d, parcoords and the maps, a parked iframe's map renders on reload, and the console shows no context-loss warnings. Standalone viz output and single dashboards are unaffected; the busiest regenerated dashboard has 3 contexts.

Not regenerated

The 4 LLM-gated PREGENERATED dashboards (smart_dict_treemap, smart_dict_sunburst, smart_world_choropleth, smart_geospatial) don't pick up the panel until a QSV_VIZ_REGEN_LLM=1 refresh. Dashboards whose only regen diff was timestamps were not committed.

Verification

• cargo t viz -F all_features: all pass. New tests: 9 integration and 3 unit (parcoords_axis_order).
• Mutation-checked: disabling the smart insert, the |r| gate, color-not-an-axis, sampling, and the --size rejection each fails its test.
• scripts/double-run-check.py --check OK; cargo +nightly fmt; clippy reports no warnings on added lines.
• In Chrome: standalone chart, smart dashboards (light/dark), and the gallery as above.

The wiki Visualization page update is staged locally and will be pushed after merge.

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