v0.2.0

Added

• Compile-time SVG support: the include_svg! macro bakes an SVG into
  flattened polygons at build time and expands to a const SvgImage, so no SVG
  parser is linked into the binary. The parsing weight (usvg + kurbo) is
  confined to the new saudade-macros proc-macro crate and runs only at compile
  time. (#22)
• Modal::on_cancel() to run a handler when a modal is dismissed; App now
  also invokes on_cancel() for top-level windows. (#18, #19)
• Container::layout() for custom child layout. (#17)
• Nested popups — a popup opened from within another popup. (#11)
• Painting at physical size, with a dedicated code path for crisper rendering at
  1.25× scale. (#13)
• The system scale factor is now readable on Wayland. (#16)

Changed

• Reworked the dialog architecture. (#21)
• Refreshed checkbox and dropdown styling. (#24, #25)

Fixed

• Buttons now activate on key release rather than on key press. (#14)
• Corrected button autorepeat behavior. (#20)
• FreeBSD: load fonts from /usr/local/share/fonts. (#12)