perf(ui): replace wildcard D3 imports with named imports for tree-shaking

[NewCoder3294]

Summary

• Replace import * as d3 from 'd3' with named imports in 5 components to enable better tree-shaking and reduce bundle size
• All d3.xxx() call sites updated to use direct function calls (e.g., select(), scaleLinear(), extent())
• D3 type references (d3.Selection, d3.GeoProjection, etc.) updated to use named type imports

Files changed

File	D3 functions extracted
src/components/ProgressChartsPanel.ts	select, extent, scaleLinear, area, curveMonotoneX, line, axisBottom, axisLeft, bisector, pointer + types Selection, ScaleLinear
src/components/SpeciesComebackPanel.ts	select, extent, max, scaleLinear, area, curveMonotoneX, line
src/components/RenewableEnergyPanel.ts	select, arc, interpolate, easeCubicOut, extent, scaleLinear, area, curveMonotoneX, line, stack, stackOrderNone, stackOffsetNone, max + type SeriesPoint
src/components/Map.ts	select, geoPath, geoEquirectangular, geoGraticule, line (as d3Line), curveCardinal + types Selection, GeoProjection, GeoPath
src/components/CountryTimeline.ts	select, scaleTime, scaleBand, axisBottom, timeFormat + types Selection, ScaleTime, ScaleBand, NumberValue

Bundle size impact

With wildcard imports (import * as d3 from 'd3'), bundlers must include the entire D3 library (~500KB unminified) even if only a handful of functions are used. Named imports allow tree-shaking to eliminate unused D3 modules, potentially reducing the D3 contribution to the bundle by 60-80% depending on the bundler configuration.

Test plan

• tsc --noEmit passes with zero errors
• Pre-push hooks pass (typecheck, API typecheck, CJS syntax, version sync)
• Verify charts render correctly in ProgressChartsPanel, SpeciesComebackPanel, RenewableEnergyPanel
• Verify map renders correctly (cables, pipelines, graticule, countries)
• Verify CountryTimeline renders event circles and axes

🤖 Generated with Claude Code

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