feat: switch to uplot for prom charts

[ellie]

Tasks

• Regenerated TS-RS bindings (if any ts(export) structs have changed)
• Updated the documentation in docs/ (if any application behavior has changed)
• I am happy for maintainers to push small adjustments to this PR, to speed up the review cycle

[greptile-apps]

Greptile Overview

Greptile Summary

Replaces ECharts with uPlot for Prometheus chart rendering. Refactors data transformation from row-based to columnar format (required by uPlot), adds custom tooltip with Grafana-style formatting, and implements proper light/dark theme support.

Changes:

• Removed echarts and @kbox-labs/react-echarts dependencies, added uplot and uplot-react
• Backend now returns columnar data: [timestamps, series1_values, series2_values, ...] instead of individual series objects
• Frontend implements custom tooltip with value formatting (K/M suffixes) and horizontal flip behavior
• Deleted PrometheusSeries type (no longer needed)

Issue found:

• Timestamp collection logic in prometheus.rs:457-460 has redundant nested conditionals that may cause confusion during maintenance

Important Files Changed

Filename	Overview
crates/atuin-desktop-runtime/src/blocks/prometheus.rs	Refactored data structure from row-based to columnar format for uPlot compatibility; potential bug in timestamp collection logic
src/components/runbooks/editor/blocks/Prometheus/lineChart.tsx	Complete rewrite replacing ECharts with uPlot; added custom tooltip, theme support, and proper TypeScript types
src/components/runbooks/editor/blocks/Prometheus/Prometheus.tsx	Updated to handle new columnar data format with separate data and seriesNames arrays

[greptile-apps]

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