Pad the settings cards, and make status and timeline readable at a glance

The Team settings cards (Escalation, Sources, Members, Switches, Single
sign-on) printed their text flush against the border with the button in the
corner: .card has never had padding and these never added any. A card with
a header row now pads itself, with the title left, the button right and a
divider before the content.

The incident page no longer carries the primary action twice. The copy up
by the status is gone and the sticky bar keeps it; Note is the timeline's
link, with Copy in the bar for a resolved incident, and the phone's More
sheet drops what the bar already shows. In the queue, a row's title wraps
to two lines so the namespace that tells rows apart is no longer cut off,
zero counts on the filter chips are dimmed, and a row omits the status the
filter already states and the team once the queue is narrowed to one.

Status colours failed 4.5:1 against their own fill in the light theme
(warning 3.6, info 4.1, critical 4.4, ok 4.45, snooze 4.49), so the light
tokens are darker; the dark theme already passed and is unchanged. Severity
badges now carry a shape as well as a colour, and each timeline event has an
icon. An escalation that ran out of levels, a failed notification and a
silent heartbeat stand out in amber or red.

Web UI only: no endpoint or JSON shape changed, so nothing to mirror in
terdut-tui.

internal/web/static/js/alerts.js

@@ -2,8 +2,8 @@
 // incident it belongs to, which is where anything can be done about it.
 
 import * as api from './api.js';
-import { h, clear, badge, emptyState, spinner } from './ui.js';
-import { age, severityClass, labelSummary } from './format.js';
+import { h, clear, badge, severityBadge, emptyState, spinner } from './ui.js';
+import { age, labelSummary } from './format.js';
 
 const FILTERS = [
   { id: 'firing', label: 'Firing', query: { status: 'firing' } },
@@ -87,7 +87,7 @@ function row(a) {
     h('div', { class: 'row-age', title: a.starts_at, text: age(a.status === 'firing' ? a.starts_at : a.received_at) }),
     h('div', { class: 'row-meta' },
       badge(a.status === 'firing' ? 'Firing' : 'Resolved', `st-${a.status}`),
-      sev && badge(sev, `plain ${severityClass(sev)}`),
+      sev && severityBadge(sev),
       summary && h('span', { text: summary }),
       labels && h('span', { class: 'labels', text: labels }),
     ),