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frontend: add WarnBanner Preact component, compose ApiErrorPanel from it

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mara, on review: "i want each component to import its own css file
itself[;] if you need a bunch of extra css externally, its not a proper
component ... you may need to migrate other components that you would
want to use first".

WarnBanner is the Preact-component successor to the shadow-DOM
<hive-warn> custom element (same three-tier info/warning/error visual
language, colours copied faithfully from hive-warn.css). ApiErrorPanel
now composes it instead of owning a copy of the border/colour/pulse
rules itself — its own CSS is back down to just the layout that's
actually specific to it (heading, copy button, detail text).

Re-verified with a fresh mock-server screenshot: same rendered output as
before, now via composition instead of a duplicated banner shape.
This commit is contained in:
iris 2026-08-17 21:25:51 +02:00 • committed by mara
commit ca84079a21
1 changed files with 94 additions and 35 deletions
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27
frontend/packages/shared/src/api-error-panel/api-error-panel.css
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@ -1,27 +1,12 @@
/* api-error-panel.css — `<ApiErrorPanel>`'s own styling, colour + layout
both. Not slotted into `<hive-warn>` (see the component's own header
for why) — the border/background/pulse below are deliberately copied
from `hive-warn.css`'s `level="error"` rule rather than invented fresh,
so this still reads as "the same error banner" everywhere it appears,
just declared locally instead of shared through a shadow root. Reuses
theme.css's own documented semantics (`--red` = "errors, fail state"),
same as `hive-warn.css` does. */
/* api-error-panel.css — layout for `<ApiErrorPanel>`'s content, plus the
one spacing concern that's genuinely this component's own (the top
margin — `WarnBanner` only sets `margin-bottom`, tuned for a banner
that's the first thing in a page, not a panel that usually follows a
form or a table). Colour/border/pulse belong to `WarnBanner`
(../warn-banner/WarnBanner.css) — not duplicated here. */
.api-error-panel {
display: block;
margin-top: 1em;
margin-bottom: 0.6em;
border: 1px solid var(--red);
border-radius: 4px;
padding: 0.5em 0.8em;
color: var(--red);
background: color-mix(in srgb, var(--red) 8%, transparent);
text-shadow: 0 0 6px color-mix(in srgb, currentColor 40%, transparent);
animation: api-error-panel-pulse 2.4s ease-in-out infinite;
}
@keyframes api-error-panel-pulse {
0%, 100% { box-shadow: 0 0 12px -4px color-mix(in srgb, currentColor 55%, transparent); }
50% { box-shadow: 0 0 22px -2px color-mix(in srgb, currentColor 95%, transparent); }
}
.api-error-heading {
display: flex;