feat: Docker diagnostic hints on disconnection

- Classify Docker errors into categories (socket_not_found, connection_refused,
  permission_denied, timeout, tls_error) with platform-specific hints
- Enrich GET /api/health with structured diagnostics (category, hints, platform)
- Expandable hints panel in sidebar when Docker is disconnected
- "Retry now" button for immediate re-check
- Collapsible raw error details for advanced users

web/src/lib/api.ts

@@ -3,6 +3,7 @@ import type {
 	ContainerStats,
 	Deploy,
 	DeployLog,
+	DockerHealth,
 	EventLogEntry,
 	EventLogStats,
 	InspectResult,
@@ -267,8 +268,8 @@ export function listNpmCertificates(): Promise<NpmCertificate[]> {
 
 // ── Health ──────────────────────────────────────────────────────────
 
-export function getHealth(): Promise<{ docker: boolean }> {
-	return get<{ docker: boolean }>('/api/health');
+export function getHealth(): Promise<{ docker: DockerHealth }> {
+	return get<{ docker: DockerHealth }>('/api/health');
 }
 
 // ── Auth ─────────────────────────────────────────────────────────────

web/src/lib/i18n/en.json

@@ -5,7 +5,9 @@
   },
   "health": {
     "connected": "connected",
-    "disconnected": "disconnected"
+    "disconnected": "disconnected",
+    "rawError": "Technical details",
+    "retryNow": "Retry now"
   },
   "nav": {
     "dashboard": "Dashboard",

web/src/lib/i18n/ru.json

@@ -5,7 +5,9 @@
   },
   "health": {
     "connected": "подключён",
-    "disconnected": "отключён"
+    "disconnected": "отключён",
+    "rawError": "Технические детали",
+    "retryNow": "Проверить сейчас"
   },
   "nav": {
     "dashboard": "Панель",

web/src/lib/types.ts

@@ -172,6 +172,16 @@ export interface Volume {
 	updated_at: string;
 }
 
+/** Docker daemon health check result. */
+export interface DockerHealth {
+	connected: boolean;
+	error?: string;
+	category?: string;
+	hints?: string[];
+	platform?: string;
+	checked_at?: string;
+}
+
 /** A persistent event log entry. */
 export interface EventLogEntry {
 	id: number;