feat: deferred dispatch, release-check provider, settings polish

- Defer quiet-hours dispatches into new deferred_dispatch table; drain
  job + periodic catch-up scan re-fire at window end with coalescing on
  (link, event_type, collection_id).
- Add ON DELETE SET NULL migration on event_log_id and partial unique
  index on (link_id, collection_id, event_type) WHERE status='pending'.
- Add release-check provider abstraction (Gitea/GitHub) with SSRF-safe
  URL validation, settings UI cassette, and scheduled polling.
- Replace importlib-only version lookup with version.py helper that
  prefers the higher of installed metadata vs source pyproject so stale
  editable dev installs stop misreporting.
- Aurora frontend polish: MetaStrip component, ReleaseCassette,
  EventDetailModal expansion, and i18n additions.

frontend/src/routes/users/+page.svelte

@@ -14,6 +14,7 @@
 	import { snackSuccess, snackError } from '$lib/stores/snackbar.svelte';
 	import ErrorBanner from '$lib/components/ErrorBanner.svelte';
 	import Button from '$lib/components/Button.svelte';
+	import MetaStrip, { type MetaTile } from '$lib/components/MetaStrip.svelte';
 	import type { User } from '$lib/types';
 
 	const auth = getAuth();
@@ -87,6 +88,31 @@
 			setTimeout(() => { resetUserId = null; resetMsg = ''; resetSuccess = false; }, 2000);
 		} catch (err: any) { resetMsg = err.message; resetSuccess = false; snackError(err.message); }
 	}
+
+	function userTiles(user: User): MetaTile[] {
+		const tiles: MetaTile[] = [];
+		const isAdmin = user.role === 'admin';
+		tiles.push({
+			icon: isAdmin ? 'mdiShieldCrownOutline' : 'mdiAccountOutline',
+			label: isAdmin ? t('users.roleAdmin') : t('users.roleUser'),
+			tone: isAdmin ? 'orchid' : 'sky',
+		});
+		tiles.push({
+			icon: 'mdiCalendarOutline',
+			label: parseDate(user.created_at).toLocaleDateString(),
+			hint: t('users.joined'),
+			tone: 'lavender',
+			mono: true,
+		});
+		if (user.id === auth.user?.id) {
+			tiles.push({
+				icon: 'mdiAccountStar',
+				label: t('users.you', 'you'),
+				tone: 'mint',
+			});
+		}
+		return tiles;
+	}
 </script>
 
 <PageHeader
@@ -133,15 +159,16 @@
 	<EmptyState icon="mdiAccountGroup" message={t('users.noUsers')} />
 </Card>
 {:else}
-<div class="space-y-3 stagger-children">
+<div class="list-stack stagger-children">
 	{#each users as user}
 		<Card hover>
-			<div class="flex items-center justify-between">
-				<div>
-					<p class="font-medium">{user.username}</p>
-					<p class="text-sm text-[var(--color-muted-foreground)]">{user.role === 'admin' ? t('users.roleAdmin') : t('users.roleUser')} · {t('users.joined')} {parseDate(user.created_at).toLocaleDateString()}</p>
+			<div class="list-row">
+				<div class="list-row__identity">
+					<p class="font-medium truncate">{user.username}</p>
+					<p class="text-sm text-[var(--color-muted-foreground)] list-row__secondary">{user.role === 'admin' ? t('users.roleAdmin') : t('users.roleUser')} · {t('users.joined')} {parseDate(user.created_at).toLocaleDateString()}</p>
 				</div>
-				<div class="flex items-center gap-1">
+				<MetaStrip tiles={userTiles(user)} />
+				<div class="list-row__actions">
 					<IconButton icon="mdiPencil" title={t('users.edit')} onclick={() => openEditUser(user)} />
 					{#if user.id !== auth.user?.id}
 						<IconButton icon="mdiKeyVariant" title={t('common.changePassword')} onclick={() => openResetPassword(user)} />