Add WinForms 26.1 Range Bar Series documentation and release notes

[Copilot]

Updates the WinForms bar chart documentation to cover the new RangeBarSeries introduced in 26.1. This adds the missing feature topic plus the corresponding 26.1 release-note surfaces in both English and Japanese.

• New Range Bar Series topic

  • Added a new WinForms topic for RangeBarSeries in English and Japanese.
  • Covers:
    • series purpose and orientation
    • required axes (NumericXAxis + CategoryYAxis)
    • HighMemberPath / LowMemberPath
    • rendering behavior for horizontal range bars
    • commonly used properties such as RadiusX, RadiusY, and Data Legend label/unit settings
    • related links to existing bar/range topics

• 26.1 release note coverage

  • Added new What's New in 2026 Volume 1 topics in English and Japanese.
  • Documented RangeBarSeries as a new chart feature and linked to the new topic.

• Changelog and history updates

  • Added a 26.1 (2026) entry to the WinForms changelog in English and Japanese.
  • Updated revision history in both languages to surface the new 2026 Volume 1 page.

• Example usage

  var xAxis = new NumericXAxis();
  var yAxis = new CategoryYAxis();
  yAxis.DataSource = data;
  yAxis.Label = "{Country}";
  
  var series = new RangeBarSeries();
  series.DataSource = data;
  series.HighMemberPath = "Coal";
  series.LowMemberPath = "Oil";
  series.XAxis = xAxis;
  series.YAxis = yAxis;

Warning

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• www.infragistics.com
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If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
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[IGvaleries]

Same comment again we no longer doing "what's new" docs.
we also stopped adding VB code snippets, but that's just an FYI, since they are heer I don't see any need to remove them

Also, not sure if that datasource was the best to demonstrate how the chart might actually be used but I guess it is OK