Pin a dialog's headline and actions, and let it be an alert dialog

Plan step 19, containment.md C-06, C-17 and C-20. The whole box scrolled,
so a long dialog scrolled its headline and its buttons away; the header,
the body and the action row are now separate rows of the flex column,
each carrying the 24dp padding the box used to hold, and only the body
scrolls. `separator` draws the divider under the header and above the
actions, where it now stays put. The full-screen header is M3's 56dp
(was 64) and its action bar 56 (was ~72). New `alert` prop for M3's "on
web, basic dialogs should have the alert dialog role", and a `subtitle`
is always the dialog's `aria-describedby`.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Qwx5USif3wFFmxtHg5U1g9
This commit is contained in:
Andreas Reinhold / reini
2026-09-14 06:01:42 +02:00
co-authored by Claude Opus 5
parent f895b553b6
commit 02d908c526
4 changed files with 98 additions and 34 deletions
@@ -475,7 +475,7 @@ An M3 dialog on native `<dialog>`. Bind with `wire:model` to a flag or an id; cl
</x-modal>
```
Props: `title`, `subtitle`, `icon` (centred hero icon), `separator`, `persistent` (no Escape or scrim), `fullscreen` (whole screen on a compact window, below `medium`, for forms — M3 allows a full-screen dialog only there), `box-class`. Never remove its `wire:ignore.self` behaviour by re-rendering it conditionally with `@if`; toggle the bound property instead.
Props: `title`, `subtitle`, `icon` (centred hero icon), `separator` (a divider under the headline and above the actions), `persistent` (no Escape or scrim), `fullscreen` (whole screen on a compact window, below `medium`, for forms — M3 allows a full-screen dialog only there), `alert` (`role="alertdialog"` for a dialog that interrupts to say something important — not for forms), `box-class`. The headline and the action row are pinned and only the body between them scrolls, as M3 requires, so do not put `overflow` on `box-class`. Never remove its `wire:ignore.self` behaviour by re-rendering it conditionally with `@if`; toggle the bound property instead.
### `<x-drawer>`