fix: restore Docker health indicator and fix empty expand when hints unavailable

web/src/routes/+layout.svelte

@@ -12,7 +12,8 @@
 	import { instanceStatusStore } from '$lib/stores/instance-status';
 	import { resolvedTheme, applyTheme } from '$lib/stores/theme';
 	import { exchangeOidcToken, setAuthToken, clearAuth, isAuthenticated } from '$lib/auth';
-	import { logout as apiLogout } from '$lib/api';
+	import { logout as apiLogout, getHealth } from '$lib/api';
+	import type { DockerHealth } from '$lib/types';
 	import { t } from '$lib/i18n';
 
 	interface Props {
@@ -35,6 +36,12 @@
 
 	let sseConnection: SSEConnection | null = null;
 	let sidebarOpen = $state(false);
+	let dockerHealth = $state<DockerHealth | null>(null);
+	let healthChecked = $state(false);
+	let healthInterval: ReturnType<typeof setInterval> | null = null;
+	let hintsExpanded = $state(false);
+
+	const dockerConnected = $derived(dockerHealth?.connected ?? false);
 
 	// Hide sidebar and chrome on the login page.
 	const isLoginPage = $derived($page.url.pathname === '/login');
@@ -68,23 +75,42 @@
 				goto('/', { replaceState: true });
 			}
 		}
+	});
 
-		// Only connect SSE when authenticated (has a token).
-		if (isAuthenticated()) {
-			sseConnection = connectGlobalEvents({
-				onInstanceStatus(payload) {
-					instanceStatusStore.update(payload);
-				},
-				onDeployStatus(payload) {
-					instanceStatusStore.notifyDeploy(payload);
-				}
-			});
+	// Start SSE and health polling when authenticated.
+	// Uses $effect to react to route changes (e.g., after login navigation).
+	$effect(() => {
+		void $page.url.pathname;
+
+		if (!isAuthenticated() || sseConnection) return;
+
+		sseConnection = connectGlobalEvents({
+			onInstanceStatus(payload) {
+				instanceStatusStore.update(payload);
+			},
+			onDeployStatus(payload) {
+				instanceStatusStore.notifyDeploy(payload);
+			}
+		});
+
+		// Poll Docker health every 30s.
+		async function checkHealth() {
+			try {
+				const h = await getHealth();
+				dockerHealth = h.docker;
+			} catch {
+				dockerHealth = { connected: false };
+			}
+			healthChecked = true;
 		}
+		checkHealth();
+		healthInterval = setInterval(checkHealth, 30_000);
 	});
 
 	onDestroy(() => {
 		sseConnection?.close();
 		sseConnection = null;
+		if (healthInterval) clearInterval(healthInterval);
 	});
 </script>
 
@@ -171,6 +197,46 @@
 
 		<!-- Footer controls -->
 		<div class="space-y-3 border-t border-[var(--border-primary)] px-4 py-3">
+			{#if healthChecked}
+				<div class="rounded-md {dockerConnected ? '' : 'bg-red-50 dark:bg-red-950/30'}">
+					<button
+						type="button"
+						class="flex w-full items-center gap-2 px-2 py-1.5 text-xs {dockerConnected ? 'text-emerald-600' : 'text-red-500 cursor-pointer'}"
+						onclick={() => { if (!dockerConnected) hintsExpanded = !hintsExpanded; }}
+						disabled={dockerConnected}
+					>
+						<span class="relative flex h-2 w-2">
+							{#if dockerConnected}
+								<span class="absolute inline-flex h-full w-full animate-ping rounded-full bg-emerald-400 opacity-50"></span>
+							{/if}
+							<span class="relative inline-flex h-2 w-2 rounded-full {dockerConnected ? 'bg-emerald-500' : 'bg-red-500'}"></span>
+						</span>
+						<span class="flex-1 text-left">Docker {dockerConnected ? $t('health.connected') : $t('health.disconnected')}</span>
+						{#if !dockerConnected && dockerHealth?.error}
+							<svg class="h-3 w-3 transition-transform {hintsExpanded ? 'rotate-180' : ''}" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2"><polyline points="6 9 12 15 18 9"/></svg>
+						{/if}
+					</button>
+					{#if !dockerConnected && hintsExpanded && dockerHealth?.error}
+						<div class="px-2 pb-2">
+							<code class="block text-[11px] text-red-600 dark:text-red-400 break-all leading-relaxed">{dockerHealth.error}</code>
+							<button
+								type="button"
+								class="mt-2 w-full rounded border border-red-300 dark:border-red-700 px-2 py-1 text-[11px] font-medium text-red-600 dark:text-red-400 hover:bg-red-100 dark:hover:bg-red-900/30 transition-colors"
+								onclick={async () => {
+									try {
+										const h = await getHealth();
+										dockerHealth = h.docker;
+									} catch {
+										dockerHealth = { connected: false };
+									}
+								}}
+							>
+								{$t('health.retryNow')}
+							</button>
+						</div>
+					{/if}
+				</div>
+			{/if}
 			<div class="flex items-center justify-between">
 				<ThemeToggle />
 				<LocaleSwitcher />