# Changelog

All notable changes to this project are documented here. The format follows
[Keep a Changelog](https://keepachangelog.com), and the project adheres to
[Semantic Versioning](https://semver.org).

## [Unreleased]

## [0.3.1] - 2026-07-07

### Fixed
- `date_picker` / `date_time_picker` / `time_picker` now accept a `form`
  attribute and forward it to the hidden value input, so the pickers work as
  editors rendered outside their `<form>` element (e.g. lantern's table cell
  editors, which submit via `form="..."`).

## [0.3.0] - 2026-07-07

### Added
- **Component system foundation**: full design-token set in
  `priv/static/lantern_ui.css` (semantic colors, shadcn-density scale — 32px
  controls / 13px text — monochrome primary + coral accent, light/dark,
  `data-lantern-density` modes), the `use LanternUI` importer with
  Fluxon-compatible `:only`/`:except`, `LanternUI.Class` helpers, and a
  dependency-free JS runtime core (`position`, `trapFocus`, `onDismiss`,
  `LanternOverlay`).
- **Primitives** (Fluxon-compatible API, `lui-*` namespaced CSS, zero build
  step): `button`/`button_group`, `icon` (curated inline Heroicons-outline
  set), `form.input`/`label`/`error`, `calendar` (WAI-ARIA month grid +
  `LanternCalendar` hook with the full APG keyboard model), and the segmented
  `datetime_field` (typeable/steppable segments to millisecond precision,
  hidden canonical input, clear-to-null) with the `LanternDatetimeField` hook.
- **Pickers**: `date_picker`, `date_time_picker` (calendar popover with
  Today/Now · Clear · Done), and `time_picker` (segments-only). Canonical
  values `YYYY-MM-DD` / `HH:MM:SS.mmm` / `YYYY-MM-DDTHH:MM:SS.mmm`; empty =
  null. Accepts Date/Time/NaiveDateTime/DateTime structs or strings.

### Fixed
- `line_chart` crosshair tooltip: size the box to the longest label + value so
  long series names (e.g. Kubernetes pod names) no longer collide with the
  right-aligned value.

### Added
- `LanternUI.Charts.line_chart/1` — multi-series time-series line chart with a
  legend and a shared crosshair tooltip (`LineHover` hook). Accepts
  `%{label, color, points: [{datetime, number}]}` series; 0-based y axis; built
  for resource/monitoring metrics.
- Initial chart set as native Phoenix LiveView function components under
  `LanternUI.Charts`: `area_chart/1`, `sparkline/1`, `bar_chart/1`.
- `LanternUI.Charts.Geometry` — pure scaling, "nice" tick, and SVG path helpers.
- `ChartHover` LiveView JS hook (`priv/static/lantern_ui_hooks.js`) for the
  crosshair + tooltip on `area_chart`.
- Optional standalone theme (`priv/static/lantern_ui.css`); components otherwise
  inherit host CSS variables (Fluxon-compatible).

[Unreleased]: https://github.com/go9/lantern-ui
[0.3.0]: https://github.com/go9/lantern-ui/releases/tag/v0.3.0