docs(examples): charts visual map example

[akashsonune]

---

Documentation.
Examples.
Dashboards Demo.
Playwright report.

Coverage Reports:

• charts-ng
• dashboards-ng
• element-ng
• element-translate-ng
• maps-ng
• native-charts-ng

[gemini-code-assist]

Code Review

This pull request introduces a new Cartesian chart example component displaying temperature over time. Feedback suggests removing redundant type assertions on the xAxis, yAxis, and series properties, as well as changing the series type from 'bar' to 'line' to align with the file name line-gradient.ts.

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[gemini-code-assist]

The type assertions as ChartXAxis and as ChartYAxis are redundant because the properties are already explicitly typed as ChartXAxis and ChartYAxis respectively.

Suggested change

	readonly xAxis: ChartXAxis = { type: 'category' } as ChartXAxis;
	readonly yAxis: ChartYAxis = { type: 'value', name: '°C' } as ChartYAxis;
	readonly xAxis: ChartXAxis = { type: 'category' };
	readonly yAxis: ChartYAxis = { type: 'value', name: '°C' };

References

1. Prefer type inference when the type is obvious and avoid redundant type casting/assertions. ^(link)

[gemini-code-assist]

The file is named line-gradient.ts, but the series type is set to 'bar'. To align with the filename and the expected line chart example, the series type should be 'line'. Additionally, the type assertion as CartesianChartSeries[] is redundant since the property is already explicitly typed.

Suggested change

	readonly series: CartesianChartSeries[] = [
	{
	type: 'bar',
	name: 'Temperature',
	data
	}
	] as CartesianChartSeries[];
	readonly series: CartesianChartSeries[] = [
	{
	type: 'line',
	name: 'Temperature',
	data
	}
	];

References

1. Prefer type inference when the type is obvious and avoid redundant type casting/assertions. ^(link)