gpuicn v0.9.0

gpuicn v0.9.0

The consistency release. Every component now reads every color, size, radius,
shadow and duration from the theme through one set of primitives, a lint keeps
it that way, and setting up a themed app is one command. The runtime pins are
unchanged: GPUI Kit 0.9.0 on gpui-pre 0.3.11 and gpui-icons 0.6.0.

One-command setup

cargo install gpuicn-cli --version 0.9.0 --locked
gpuicn new my-app --base-color zinc --appearance dark
cd my-app && cargo run

• ui::app::run: the starter main.rs is a window title, a theme pair and
  a root view. app::run(AppConfig::new("My App").themes(light, dark), |_, _| Root)
  opens the platform with the Lucide assets, loads the bundled Geist fonts,
  installs the pair, follows the operating system's appearance and opens the
  window. AppConfig::install does the same without a window.
• Theme pairs: UiTheme::set_pair, UiTheme::set_appearance with
  Appearance::{Light, Dark, System}, and theme::follow_system.
• shadcn's base colors: gpuicn init writes assets/theme.css from
  neutral, stone, zinc, mauve, olive, mist or taupe and generates
  src/ui/app_theme.rs. gpuicn theme set --base-color stone --radius 0.5rem --appearance dark changes it; gpuicn theme import theme.css takes a theme
  from the shadcn theme editor or tweakcn; gpuicn theme preview prints every
  token.
• gpuicn update moves an app to a release (config, Cargo pins, fonts,
  theme files, then status); gpuicn doctor checks everything against
  the CLI's release and prints a fix per finding; gpuicn remove --unused
  deletes components your code never names.
• gpuicn.toml is version 2 with a [theme] table. Version 1 files still load.

Consistent by construction

• Primitives in theme::primitives: text, icon, focus, disabled,
  surface, control, clipped_image, dismiss, hover_reveal_in_group.
  Every component uses them; the registry lint in crates/ui/tests fails a
  change that reintroduces a raw color, text size, opacity, mode branch,
  popover background, hover state, key glyph or pub(crate) item.
• Focus is one 3px outer ring in ring at 50%, shown through
  focus_visible, on every control.
• Tokens: status colors (success, warning, info, with foregrounds),
  destructive_foreground, typography (xs to xl with line heights),
  breakpoints, and derived control() colors per mode. Every GPUI Kit
  component color follows a token (a test enumerates them).
• Motion: transition_with and presence_with over the theme durations,
  UiEasing::Emphasized; dialogs fade in and no longer scroll themselves.
• Input and Textarea share one InputCore; Message hover actions use a group
  instead of state.

Reliability

• MessageList has a position-based scrollbar (MessageListScrollbar)
  that estimates unmeasured rows from the measured average, so the thumb
  tracks position in long histories instead of jumping as rows are measured
  (#83). Pass scrollbar_handle to share one across re-renders.
• Toast schedules on deadlines instead of polling every 50ms.
• Tooltip installs one Escape interceptor for the application.
• Every component is drawn in both themes by a test; interactive ones have
  behavior tests in crates/ui/tests/catalog.rs.

Message

• density(MessageDensity::Compact): one line per post, the time always in
  the gutter, the name inline, half the row padding (#88).

For contributors

• One preview file per component under site/src/previews/;
  cargo xtask new-component <name> scaffolds a component everywhere the
  catalog expects one. docs/design.md states the rules.
• Releases ship catalog-screenshots-<tag>.zip, the light and dark sheet of
  every preview, and docs/screenshots/v0.9.0 holds this release's.

Breaking changes

• UiTheme::shadows entries are Arc<[BoxShadow]>; call .to_vec() where a
  Vec is needed.
• sidebar_is_mobile(window, cx) takes the window.
• UiColors::slot is public but #[doc(hidden)].

Upgrading

cargo install gpuicn-cli --version 0.9.0 --locked --force
gpuicn update --to 0.9.0     # config, pins, fonts, theme files; then `gpuicn diff`
gpuicn update --overwrite    # replace installed files once your edits are reviewed
gpuicn doctor

Apps that keep their own main.rs can switch to ui::app::run or keep
calling ui::theme::init(cx); doctor accepts both.