v0.28.2

Fixes and one option from DataZooDE/anofox-visualization's #318 ports:
ScaleDateTime::domain(), so PlotGrid can align date axes (#207);
PlotGrid keeps each cell's own svg_attrs (#208); axis label fit leaves a
legible gap between kept tick labels (#212); a multi-geometry geom_sf row is
one mark (#213); compact relative SVG path encoding for geom_sf (#214). No API
breaks (cargo-semver-checks against v0.28.1).

Added

• geom_sf's native SVG output is more compact for large boundaries
  (#214): the new DrawBackend::draw_polygon_rings_precise (default
  impl just forwards to the existing draw_polygon_rings[_pattern], so
  no other backend or geom changes) lets a caller ask for relative-command,
  configurable-decimal-precision path data instead of absolute M/L
  2-decimal commands. GeomSf opts in automatically, tied to its own
  simplify_px (1 decimal whenever simplification is on, the default);
  .simplify(0.0) keeps the exact absolute encoding. Every other
  draw_polygon_rings[_pattern] caller (geom_rect/geom_tile/
  geom_polygon) is untouched, so their output doesn't move. Found
  porting DataZooDE/anofox-visualization#420.

Fixed

• check.overlap could leave adjacent continuous x tick labels touching
  (#212, upstream issue DataZooDE/anofox-visualization#450). The thinning
  pass only required two kept labels' estimated bounding boxes not to
  literally intersect — on a narrow panel (a dashboard card's plot area
  squeezed by a right-hand legend) that could leave as little as ~1 px
  between them, which on real font metrics reads as one garbled run (25
  next to 50 as 2550). draw_x_axis now also requires one space
  character's width of clearance between every pair of kept labels, not
  just "don't touch" — a 0/25/50/75/100 set over a ~50 px panel now keeps
  0/50/100 instead of 0/25/50/100 with a sub-pixel gap.
• PlotGrid::axis_collect(AxisCollect::CollectX) (#175) skipped every
  column with a date x axis, warning plot_grid: a column's x scale is discrete or untrained; x domain not collected and leaving every cell —
  chart included — unaligned (#207, upstream issue
  DataZooDE/anofox-visualization#422: every ::TRACK fixture there uses a
  date x axis). collect_x_domain reads a cell's x scale via
  Scale::domain(), which defaults to None and is overridden by
  ScaleContinuous but wasn't by ScaleDateTime (it only implemented
  train() and expanded_domain()) — so a date scale always looked
  "untrained" to it, regardless of how much data it had actually trained
  on. ScaleDateTime::domain() now returns its trained (min, max), same
  as ScaleContinuous's. Audited every other position (X/Y) scale
  (ScaleContinuous, ScaleDateTime, ScaleDiscrete) for the same gap —
  ScaleDiscrete correctly has no domain() and is excluded by
  CollectX's own is_discrete() check instead, so it needed no change.
• PlotGrid silently dropped each cell's own GGPlot::svg_attr/
  svg_attrs once composed (#208, upstream issue
  DataZooDE/anofox-visualization#422: every ::TRACK cell's data-track
  attribute never reached the composed SVG). prepare_plot never carried
  GGPlot::root_attrs past build_for_render (which consumes and drops
  it), and render_prepared's per-cell render only ever wrote
  root_data_attrs + data-panel to the cell's own root <svg>. A
  cell's own svg_attrs are now captured alongside svg_formatted_values
  (the same build_for_render-discards-it problem that field already
  had) and applied — allow-listed and collision-checked exactly as a
  lone plot's or the grid's own, via the same validate_root_attrs — on
  a <g> wrapping that cell's content, so they don't collide with
  ggplot-rs's own per-cell root attributes or the grid's own svg_attrs
  on the grid's root. A cell with no svg_attr call gets no <g>
  wrapper at all — unaffected output.
• geom_sf (#213): a MultiPolygon row now draws as one mark — one
  <path> with one M…Z subpath per ring and part under the even-odd
  fill rule, one set of row attributes/data-*, one tooltip — instead of
  one separate mark per part (a country with islands no longer produces
  N marks sharing the same data-row). Single-Polygon output is
  unchanged. Found porting DataZooDE/anofox-visualization#420.