Renders a bar chart using the ChartNew.js (Chart.js v1) library.
Bar — set as ReportType in def_report.
def Render(self, Param1="", Param2="", Param3="") -> str:
Returns an HTML <canvas> element and an inline <script> that initialises a stacked-capable bar chart. The query's first column provides x-axis labels; subsequent columns provide dataset values. Bar colours are taken from self._Colour (comma-separated list).
Requires ChartNew.min.js. Uses Chart.js v1 API (Chart.Bar). The chart is responsive with maintainAspectRatio: false.