feat(dialog-sdk): add per-series color and interactive chart legend#51
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Extend ChartSeries with an optional color field (hex "#rrggbb") that overrides the Qt Charts theme color for individual series. When set, the ChartPreviewWidget applies a QPen with the specified color after addSeries so the theme assignment does not win. Add an interactive legend to ChartPreviewWidget: clicking a legend marker toggles the corresponding series visibility (with faded label when hidden). Define the matplotlib tab10 10-color palette for consistent default colors across chart instances.
Remove setCodeContent, setCodeLanguage, codeContent and codeLanguage from this branch — they were accidentally included from the source commit but belong to the code editor PR (#43), not the chart color PR.
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Summary
ChartSeries::coloroptional hex field ("#rrggbb") — when set, overrides the Qt Charts theme color for that seriesChartPreviewWidgetapplies aQPenwith the specified color afteraddSeriesso the theme assignment does not winTest plan
pj_plugins— no compile errorscolor: "#ff7f0e"on a ChartSeries — chart preview renders the series in orange