feat: account pool per tool with groups and a Cursor pool; update runs in the background

- The update dialog can be closed while an update applies: it keeps running,
  the page still reloads itself when the new server is up, and a failure
  re-opens the dialog with its error.
- Account pool card: one tab per AI tool (Claude Code, Codex, Cursor CLI,
  Oh My Pi, and every other installed tool, which says it has no pool),
  accounts as cards with 5-hour and weekly quota shown as what is LEFT plus
  their reset times, and the saved profiles of Settings → AI tools →
  Profiles as cards with "Share to pool".
- Cursor account pool (server/lib/cursor-pool.js): Cursor API keys handed to
  a cursor-agent pane only through tmux -e CURSOR_API_KEY;
  `agenthub accounts add <name> --tool cursor`.
- Pool groups (server/lib/pool-groups.js, /api/accounts/groups): a group's
  members run only on its accounts of each tool, a user in no group on the
  accounts no group lists, a pin still wins. account_pins loses its tool
  CHECK (rebuilt, pins kept); three new tables.
- Oh My Pi login sharing can be switched from its pool tab too.

client/src/components/UpdateNotifier.tsx

@@ -17,8 +17,10 @@
  * keeps answering while the chain installs. New skills/slash commands still
  * need `/reload-plugins` in an already-open Claude Code session; nothing a
  * background process can do for it. Escape, the backdrop and × close it for
- * this page load only (never while applying); "Skip this version" is the one
- * persistent, per-version dismiss. After a failed update, "Auto fix" hands the
+ * this page load only — also while an update applies: it keeps running in the
+ * background (the page still reloads itself once the new server is up), and a
+ * failure re-opens the modal with its error; "Skip this version" is the one
+ * persistent, per-version dismiss (never while applying). After a failed update, "Auto fix" hands the
  * error to an AI agent: it opens (or adopts) a workspace on the install folder
  * and starts a Claude Code session there with the error as its prompt — the
  * agent fixes whatever blocked the update (a dirty lockfile, a failed build…)
@@ -246,10 +248,13 @@ export function UpdateNotifier() {
   );
   const busy = applying || restarting || fixing;
 
+  // Closing while an update applies only hides it: the apply request and the
+  // poll that reloads the page keep running, and a failure re-opens it.
   const closeForNow = useCallback(() => {
-    if (busy || !dismissKey) return;
+    if (!dismissKey) return;
+    if (applying || restarting) toast.info(t("backgroundNote"));
     setClosedKey(dismissKey);
-  }, [busy, dismissKey]);
+  }, [applying, restarting, dismissKey, t]);
 
   const dismiss = useCallback(() => {
     if (busy || !dismissKey) return;
@@ -261,8 +266,8 @@ export function UpdateNotifier() {
     setDismissedSha(dismissKey);
   }, [busy, dismissKey]);
 
-  // Escape closes for now — never while an update is applying.
-  useDialog(show, panelRef, busy ? undefined : closeForNow);
+  // Escape closes for now — an applying update carries on in the background.
+  useDialog(show, panelRef, closeForNow);
 
   const copyCmd = async () => {
     if (!status?.manual_command) return;
@@ -315,6 +320,7 @@ export function UpdateNotifier() {
               syncFromPayload(s);
               setRestarting(false);
               if (v.ok) toast.info(t("pluginAlreadyCurrent"));
+              else setClosedKey(null); // closed while it ran: show why it failed
               return;
             }
             // A new version answering is back too, even if a poll never
@@ -359,6 +365,8 @@ export function UpdateNotifier() {
     } finally {
       setApplying(false);
     }
+    // Not applied: re-open a modal closed while it ran, so the error is seen.
+    setClosedKey(null);
   };
 
   // Hand the failure to an AI agent: a workspace on the install folder (the
@@ -436,7 +444,6 @@ export function UpdateNotifier() {
           <button
             type="button"
             onClick={closeForNow}
-            disabled={busy}
             aria-label={t("later")}
             className="p-1.5 -m-1 rounded-lg text-fg-muted hover:text-fg-secondary hover:bg-surface-4 transition-colors flex-shrink-0"
           >