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feat(web): toast anchoring and model-selection rejection banner

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The toast sits 120px from the viewport top and centers over its anchor —
the composer card, so it centers on the chat column rather than the window;
a rejected model selection (e.g. picking a text-only model while the
session holds images) announces through the same banner while the in-menu
strip with Retry stays the catalog-load surface. The attachment rail
consumes every wheel tick with a vertical component: a diagonal pan keeps
its horizontal intent and nothing scrolls the conversation behind the
composer.
This commit is contained in:
creatixchu
2026-08-11 18:00:56 +08:00
parent 87e3c95027
commit dc42e6b822
17 changed files with 158 additions and 42 deletions
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packages/client/ui-primitives/README.md
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@@ -10,7 +10,7 @@ Pure React atoms (zero cordis): StateDot, DisclosureRow, ic_ds_* icons, Button/P
## Toast
`Toast` is the transient top-center banner: it slides in, holds at full opacity for three seconds, fades over one second, then calls `onDone` so the owner can unmount it. It renders `role="alert"` with an optional leading icon slot and takes its copy as a required prop (zero-cordis: the owner localizes). Re-showing the same message requires a remount — owners key the element by a per-show sequence so an identical repeated message restarts the hold-and-fade cycle instead of silently reusing the faded banner. It layers above the ui-attachment image lightbox so a failure reported during a preview stays readable.
`Toast` is the transient top banner: it slides in, holds at full opacity for three seconds, fades over one second, then calls `onDone` so the owner can unmount it. It renders `role="alert"` with an optional leading icon slot and takes its copy as a required prop (zero-cordis: the owner localizes). It body-portals with `pointer-events: none`, sits 120px from the viewport top, and centers horizontally over the optional `anchor` element (re-measured on window resizes) — the composer passes its card so the banner centers over the chat column rather than the whole window — falling back to the viewport center without one. Re-showing the same message requires a remount — owners key the element by a per-show sequence so an identical repeated message restarts the hold-and-fade cycle instead of silently reusing the faded banner. Under `prefers-reduced-motion: reduce` the slide-in is dropped and only the delayed fade remains. It layers above the ui-attachment image lightbox so a failure reported during a preview stays readable.
## Markdown rendering