bar chart support

[gingerwizard]

Summary

This PR introduces Bar Charts. Historically, bar charts were effectively bar charts over time series. This implements true bar charts where the x-axis can be any grouping key.

As a result of this, line/bar charts are now called "Time Series"

Screenshots or video

How to test locally or on Vercel

1. Navigate to Chart Explorer.
2. Build a bar chart - Demo Traces - Group by ServiceName

[vercel]

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Latest commit: 5d7cbe2

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[github-actions]

PR Review

• ⚠️ groupBy validation uses !form.groupBy which won't catch groupBy = [] (empty array is truthy in JS) → Change to !form.groupBy || (Array.isArray(form.groupBy) && form.groupBy.length === 0) in ChartEditor/utils.ts:260

• ⚠️ formatResponseForPieChart reused for bar chart data in DBBarChart.tsx:185 → Shared usage is fine if the format is identical, but consider extracting to a shared formatCategoricalChartData utility to avoid confusion for future maintainers

• ℹ️ BarChartTooltip memo component missing displayName → Add BarChartTooltip.displayName = 'BarChartTooltip' for better React DevTools experience (minor)

Overall the implementation is solid, follows existing patterns (mirrors DBPieChart closely), and the enum/validation/routing additions are correct. The operator precedence in the updated validateChartForm condition is fine — the parens correctly wrap all three display types.