This page records changes to the installable Svelte port, its source registry, and its agent skill.
Docs-only, test-only, CI, and contributor-workflow changes are recorded in their pull requests.

## 2026-08-30

- Added ECharts counterparts for every LayerChart dashboard block and aligned shared block data,
  palettes, supporting metrics, and responsive compositions across providers. The ECharts Bar API
  now includes isometric bars, reference lines, and row-hover callbacks; ECharts Radar series add
  dashed strokes and optional glow for those compositions.
- Preserved null and non-finite data as real gaps across ECharts Area, Line, and Composed charts,
  including their brushes, reveal layers, buffer lines, hit targets, and tooltips.
- Gave both Sankey providers the same guarded data contract and expanded ECharts keyboard and
  controlled-selection coverage across chart families.
- Unified registry source rewriting and consumer dependency versions across generated installs.
- Added the installable `evilcharts-svelte` agent skill, with skills.sh-compatible and HTTP discovery, a
  complete chart and compound-component catalog, implementation workflows, example and block
  guidance, plus links to the Markdown docs, Context7 library, and MCP endpoint.
- Added controlled selection to LayerChart Area and Pie roots without remounting chart state, and
  made ECharts resolve chart-local color changes after mount.
- Hardened LayerChart Sankey layout for invalid endpoints, cycles, zero-flow graphs, and numeric
  edge cases while preserving valid Recharts-compatible geometry.
- Added Apache ECharts as a complete second rendering provider for all eight chart families, with
  Canvas rendering by default and optional SVG output.
- Added provider-specific ECharts tooltips, legends, dots, brushes, loading states, examples,
  dashboard blocks, registry items, documentation, and agent-readable pages.
- Added ordered-dither treatments for the ECharts area, line, bar, composed, pie, and radar charts,
  preserving the Dither Kit attribution and licence boundary.
- Added a provider switcher so readers can move between matching LayerChart and ECharts pages.
- Fixed production renderer registration so Canvas and SVG charts still initialize after
  tree-shaking.
- Aligned ECharts legends, brushes, basic Area geometry, loading states, and radial chart clearance
  with the original provider layouts.
- Kept Area loading geometry fixed while its Line-style top stroke and translucent fill use the same
  travelling shimmer mask; loading data changes only after that mask leaves the plot.
- Matched the data and chart configuration of all 113 upstream LayerChart examples and mirrored
  the same examples in the ECharts provider, apart from the six documented dither additions.
- Preserved chart-owned animation lifecycles when consumer ECharts options are merged and made
  loading, dashed-stroke, hover, and landing motion respect reduced-motion preferences.
- Restored the original ECharts Bar, Pie, and Radial entrances by initializing each renderer only
  after its primary compound series is registered; Composed bars now use the same grow lifecycle.
- Made LayerChart Cartesian entrances use one uninterrupted chart-owned timeline, preventing
  scale remounts from shortening or restarting reveals, and matched Area and Line wipe speed to
  the ECharts provider.
- Added keyboard controls for clickable series and ECharts brush ranges without duplicating an
  existing clickable legend.
- Aligned shared theme tokens and legend spacing with the original, and made generated chart CSS
  safe for arbitrary chart IDs and data keys.

## 2026-08-27

- Loading states now match the original chart geometry, including cartesian category spacing,
  Area chart domain headroom, Radial chart ring placement, and Pie chart legend clearance.
- Area loading curves now remain static while the shimmer crosses the plot, matching the original.
- Area loading now renders its moving top stroke with the same masked spline as Line loading,
  while the shimmer continues through the gradient fill beneath it.
- Radial loading bars now tween between values with the original 1.5-second ease-in-out motion.
- Radial plots now reserve the full edge-legend band so outer rings cannot overlap the legend.

## 2026-08-25

- Tooltips now escape cards with `overflow: hidden` while keeping chart-scoped series colors.