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frontend: add <hive-btn> component, use it for dialog buttons

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mara: 'wait the common styles is literally just the button stuff? pls
make a button component now as part of this pr and replace the usage
in the modal. replacing all usages and finally removing the btn styles
from common css is a follow up then.'

<hive-btn> (hive-btn.js) is a customized built-in <button is="hive-btn">
with its own shadow root -- extending HTMLButtonElement keeps every
native button behaviour (click/keyboard activation, :disabled, form
participation) instead of re-implementing it on a generic wrapper.
Shadow root holds only an adopted stylesheet + a <slot>, so the
button's light-DOM content (label, or asyncBtn's swapped-in spinner
span) renders through unchanged -- slotted content stays styled by the
light-DOM cascade, so the global .spinner class still applies.
Variants (cancel/confirm/danger) are a 'variant' attribute, not a CSS
class, since they're a semantic prop of the component.

Customized built-ins aren't supported in Safari/WebKit -- fine here,
the project targets recent Firefox only (same reasoning as the
original custom-elements pilot).

Wired into modal.js: HiveDialog's buttons now render as
<button is="hive-btn" variant="...">, replacing the old
component-common.css .btn copy -- deleted that file + component-
styles.js entirely (their sole purpose was giving dialog buttons a
.btn look, which hive-btn now owns properly). dom.js's el() gained
 support so it can create customized built-ins the same way it
creates everything else. hive-dialog.css dropped the now-dead
.cancel/.confirm/.confirm.danger rules.

Per mara's scoping: NOT touching the other .btn consumers across the
app (dashboard/agent submit buttons, form() helper, etc.) or removing
.btn from dashboard/common.css / agent/agent.css in this PR -- that
migration + cleanup is an explicit follow-up.

Verified with a full frontend build (grepped bundled JS for hive-btn/
variant to confirm it inlines); nix fmt clean.
This commit is contained in:
iris 2026-07-28 00:45:41 +02:00 • committed by mara
commit a588ed42ce
9 changed files with 123 additions and 122 deletions
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11
frontend/packages/shared/src/hive-dialog.css
View file

@ -1,8 +1,10 @@
/* hive-dialog.css — scoped stylesheet for the <hive-dialog> shadow-DOM
custom element (modal.js). Loaded as raw text at build time (esbuild's
`text` loader) and adopted via `adoptedStyleSheets` alongside
component-common.css. `:host` styles the element itself, which *is*
the fixed-position backdrop — no separate light-DOM backdrop div. */
`text` loader) and adopted via `adoptedStyleSheets`. `:host` styles the
element itself, which *is* the fixed-position backdrop — no separate
light-DOM backdrop div. Button styling (base look + cancel/confirm/
danger variants) lives in hive-btn.css, not here — the dialog's
buttons are <hive-btn> elements with their own shadow root. */
:host {
position: fixed;
@ -50,9 +52,6 @@
gap: 0.6em;
margin-top: 0.2em;
}
.cancel { color: var(--subtext0); }
.confirm { color: var(--green); }
.confirm.danger { color: var(--red); }
.promptfield { display: flex; flex-direction: column; gap: 0.4em; }
.promptlabel { color: var(--subtext0); font-size: 0.9em; }
.input {