fix: separate LXC package checks from installation

AppImage/lib/lxc-update-observation.ts

@@ -4,6 +4,17 @@ interface UpdateObservation {
   last_check?: string | null
   stale?: boolean
   stale_after_seconds?: number
+  available?: boolean
+  count?: number | null
+  error?: string | null
+}
+
+export function getLxcOsUpdateState(observation?: UpdateObservation, now = Date.now()): "unknown" | "pending" | "current" {
+  if (isLxcUpdateStale(observation, now) || observation?.error
+      || typeof observation?.available !== "boolean"
+      || !Number.isInteger(observation.count) || (observation.count ?? -1) < 0
+      || observation.available !== ((observation.count ?? 0) > 0)) return "unknown"
+  return observation.available ? "pending" : "current"
 }
 
 export function isLxcUpdateStale(observation?: UpdateObservation, now = Date.now()): boolean {
@@ -19,3 +30,18 @@ export function isLxcUpdateStale(observation?: UpdateObservation, now = Date.now
 export function checkLxcUpdates<T>(vmid: number): Promise<T> {
   return fetchApi<T>(`/api/vms/${vmid}/updates/check`, { method: "POST" })
 }
+
+// Separate explicit action: refresh indexes, check only, restore stopped CT.
+// The backend owns the job even if the browser closes or navigates away.
+export async function refreshCheckLxcUpdates<T>(vmid: number): Promise<T> {
+  const job = await fetchApi<{ job_id: string }>(`/api/vms/${vmid}/updates/refresh-check`, { method: "POST" })
+  const deadline = Date.now() + 8 * 60_000
+  while (Date.now() < deadline) {
+    const result = await fetchApi<{ state: string; error?: string; update_check?: T }>(
+      `/api/vms/${vmid}/updates/refresh-check/${job.job_id}`)
+    if (result.state === "failed") throw new Error("osStatusUnavailable")
+    if (result.state === "complete") return result.update_check as T
+    await new Promise(resolve => setTimeout(resolve, 1000))
+  }
+  throw new Error("checkStillRunning")
+}

AppImage/lib/update-action-style.ts

@@ -0,0 +1,7 @@
+// Use the dashboard's existing update colors for every executable action.
+// Version availability remains separate from action styling and enablement.
+export function getUpdateActionButtonClass(hasUpdate: boolean, isCurrent: boolean): string {
+  return !hasUpdate && isCurrent
+    ? "bg-green-500/10 hover:bg-green-500/20 border border-green-500/30 text-green-400 hover:text-green-300"
+    : "bg-purple-600/15 hover:bg-purple-600/25 border border-purple-500/40 text-purple-300 hover:text-purple-200"
+}