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/tracking-configs/+page.svelte

@@ -26,6 +26,7 @@
 	import { getDescriptor, buildTrackingFormDefaults } from '$lib/providers';
 	import ErrorBanner from '$lib/components/ErrorBanner.svelte';
 	import Button from '$lib/components/Button.svelte';
+	import MetaStrip, { type MetaTile } from '$lib/components/MetaStrip.svelte';
 
 	/** Grid-select item source lookup — maps descriptor string name to actual function. */
 	const gridItemSources: Record<string, () => any[]> = {
@@ -238,6 +239,38 @@
 		window.history.replaceState(null, '', cleanUrl);
 	}
 
+	function trackingConfigTiles(config: Record<string, any>): MetaTile[] {
+		const tiles: MetaTile[] = [];
+		const desc = getDescriptor(config.provider_type);
+		const events = (desc?.eventFields ?? []).filter(f => config[f.key]);
+		tiles.push({
+			icon: 'mdiPulse',
+			value: String(events.length),
+			label: t('trackingConfig.eventTracking'),
+			hint: events.map(f => t(f.label)).join(', ') || undefined,
+			tone: events.length > 0 ? 'lavender' : 'default',
+		});
+		if (config.periodic_enabled) {
+			tiles.push({ icon: 'mdiTimerSyncOutline', label: t('trackingConfig.periodic'), tone: 'mint' });
+		}
+		if (config.scheduled_enabled) {
+			tiles.push({ icon: 'mdiCalendarClock', label: t('trackingConfig.scheduled'), tone: 'sky' });
+		}
+		if (config.memory_enabled) {
+			tiles.push({ icon: 'mdiHistory', label: t('trackingConfig.memory'), tone: 'orchid' });
+		}
+		if (config.quiet_hours_start && config.quiet_hours_end) {
+			tiles.push({
+				icon: 'mdiWeatherNight',
+				label: `${config.quiet_hours_start}–${config.quiet_hours_end}`,
+				hint: t('trackingConfig.quietHoursStart'),
+				tone: 'citrus',
+				mono: true,
+			});
+		}
+		return tiles;
+	}
+
 	function openNew() { form = defaultForm(); nameManuallyEdited = false; editing = null; showForm = true; }
 	function edit(c: any) {
 		form = { ...defaultForm(), ...c };
@@ -448,25 +481,26 @@
 		<EmptyState icon="mdiFilterOff" message={t('common.noFilterResults')} />
 	</Card>
 {:else}
-	<div class="space-y-3 stagger-children">
+	<div class="list-stack stagger-children">
 		{#each configs as config}
 			{@const desc = getDescriptor(config.provider_type)}
 			<Card hover entityId={config.id}>
-				<div class="flex items-center justify-between">
-					<div>
-						<div class="flex items-center gap-2">
-							<span style="color: var(--color-primary);"><MdiIcon name={providerDefaultIcon({ icon: config.icon, type: config.provider_type })} size={20} /></span>
-							<p class="font-medium">{config.name}</p>
-							<span class="text-xs px-1.5 py-0.5 rounded bg-[var(--color-muted)] text-[var(--color-muted-foreground)] font-mono">{config.provider_type}</span>
+				<div class="list-row">
+					<div class="list-row__identity">
+						<div class="flex items-center gap-2 min-w-0">
+							<span style="color: var(--color-primary);" class="shrink-0"><MdiIcon name={providerDefaultIcon({ icon: config.icon, type: config.provider_type })} size={20} /></span>
+							<p class="font-medium truncate">{config.name}</p>
+							<span class="text-xs px-1.5 py-0.5 rounded bg-[var(--color-muted)] text-[var(--color-muted-foreground)] font-mono shrink-0">{config.provider_type}</span>
 						</div>
-						<p class="text-sm text-[var(--color-muted-foreground)]">
+						<p class="text-sm text-[var(--color-muted-foreground)] list-row__secondary">
 							{(desc?.eventFields ?? []).filter(f => (config as Record<string, any>)[f.key]).map(f => t(f.label)).join(', ')}
 							{config.periodic_enabled ? ` · ${t('trackingConfig.periodic')}` : ''}
 							{config.scheduled_enabled ? ` · ${t('trackingConfig.scheduled')}` : ''}
 							{config.memory_enabled ? ` · ${t('trackingConfig.memory')}` : ''}
 						</p>
 					</div>
-					<div class="flex items-center gap-1">
+					<MetaStrip tiles={trackingConfigTiles(config)} />
+					<div class="list-row__actions">
 						<IconButton icon="mdiPencil" title={t('common.edit')} onclick={() => edit(config)} />
 						<IconButton icon="mdiDelete" title={t('common.delete')} onclick={() => remove(config.id)} variant="danger" />
 					</div>