fix: per-event delete button, Docker network default, polling interval duration parsing

- Add per-event delete button (trash icon on hover) in event log entries
- Set Docker network default to 'docker-watcher' in DB schema + migration for existing DBs
- Parse Go duration strings (5m, 1h) to seconds in settings UI, convert back on save
- Clear error when network is empty in deployer instead of hidden fallback

web/src/lib/components/EventLogEntry.svelte

@@ -5,13 +5,15 @@
 <script lang="ts">
 	import type { EventLogEntry } from '$lib/types';
 	import { t } from '$lib/i18n';
+	import { IconTrash } from '$lib/components/icons';
 
 	interface Props {
 		entry: EventLogEntry;
 		isNew?: boolean;
+		ondelete?: (id: number) => void;
 	}
 
-	const { entry, isNew = false }: Props = $props();
+	const { entry, isNew = false, ondelete }: Props = $props();
 
 	let expanded = $state(false);
 
@@ -82,6 +84,16 @@
 			<span class="ml-auto shrink-0 text-[var(--text-tertiary)] tabular-nums" title={formatFull(entry.created_at)}>
 				{timeAgo(entry.created_at)}
 			</span>
+			{#if ondelete}
+				<button
+					type="button"
+					title={$t('common.delete')}
+					onclick={() => ondelete(entry.id)}
+					class="shrink-0 rounded p-0.5 text-[var(--text-tertiary)] opacity-0 group-hover:opacity-100 hover:text-[var(--color-danger)] transition-all"
+				>
+					<IconTrash size={12} />
+				</button>
+			{/if}
 		</div>
 
 		<!-- Message -->