Each ChartTypePlugin now declares:
- display_name: human-readable label for the chart_type discriminator
(e.g. "Line / Bar / Area / Scatter Chart", "Pivot Table")
- native_viz_types: dict mapping every Superset-internal viz_type the
plugin produces to a user-friendly name
(e.g. {"echarts_timeseries_line": "Line Chart", "echarts_area": "Area Chart"})
The registry gains display_name_for_viz_type(viz_type) which searches
all plugins' native_viz_types maps, replacing the need for a separate
viz_type_display_names.json or viz_type_names.py module.
ChartInfo gains a chart_type_display_name field populated via the registry,
so list_charts / get_chart_info return human-readable chart type names.
The MCP system instructions now reference display names rather than
internal viz_type identifiers.
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