feat: parallel agent upgrades with per-host log panels (0.4.2)

Allow multiple remote update jobs at once; each upgrade gets its own
bottom-right log dock that auto-closes 30s after success.

Co-authored-by: Cursor <cursoragent@cursor.com>

frontend/src/views/HostsView.vue

@@ -71,8 +71,7 @@
             <HostAgentVersionUpgrade
               :host="h"
               :git="data"
-              :updating="upgradingHostId === h.id"
-              :upgrade-blocked="upgradingHostId != null && upgradingHostId !== h.id"
+              :updating="isHostRemoteActionActive(h.id)"
               :outdated-highlight="isVersionOutdated(h)"
               @upgrade="startAgentUpgrade(h)"
             />
@@ -132,7 +131,11 @@ import {
   remoteActionKindForHost,
   remoteActionTitleForHost,
 } from "../utils/hostAgentUpgrade";
-import { runHostRemoteAction } from "../composables/useHostRemoteAction";
+import {
+  isHostRemoteActionActive,
+  runHostRemoteAction,
+  showHostRemoteActionLog,
+} from "../composables/useHostRemoteAction";
 import HostAgentVersionUpgrade from "../components/HostAgentVersionUpgrade.vue";
 
 const router = useRouter();
@@ -197,7 +200,6 @@ const initialSort = loadHostsSortPrefs();
 const sortBy = ref<SortKey>(initialSort.sortBy);
 const sortDir = ref<"asc" | "desc">(initialSort.sortDir);
 const deletingId = ref<number | null>(null);
-const upgradingHostId = ref<number | null>(null);
 let patchingHostRow = false;
 let unsubscribeHostPatch: (() => void) | null = null;
 
@@ -234,17 +236,16 @@ function isVersionOutdated(h: HostSummary): boolean {
 }
 
 async function startAgentUpgrade(h: HostSummary) {
-  if (!isGitAgentUpgradeAvailable(h, data.value) || upgradingHostId.value != null) {
+  if (!isGitAgentUpgradeAvailable(h, data.value)) {
+    return;
+  }
+  if (isHostRemoteActionActive(h.id)) {
+    showHostRemoteActionLog(h.id);
     return;
   }
   const kind = remoteActionKindForHost(h);
   if (!kind) return;
-  upgradingHostId.value = h.id;
-  try {
-    await runHostRemoteAction(h.id, remoteActionTitleForHost(h), kind);
-  } finally {
-    upgradingHostId.value = null;
-  }
+  void runHostRemoteAction(h.id, remoteActionTitleForHost(h), kind);
 }
 
 function openHost(id: number) {