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/lib/api.ts

@@ -660,6 +660,13 @@ export type PoolAccount = {
   spend7d: number;
   tokens5h: number;
   tokens7d: number;
+  /** The last usage reading of the account's own token, or null before one. */
+  quota?: {
+    fiveHour: CcUsageWindow | null;
+    sevenDay: CcUsageWindow | null;
+    checkedAt: string;
+    error: string | null;
+  } | null;
   quotaPercent: number | null;
   full: boolean;
 };
@@ -673,6 +680,11 @@ export type CodexPoolAccount = {
   spend7d: number;
   tokens5h: number;
   tokens7d: number;
+  /** The newest `rate_limits` its sessions' rollouts carry (`5h`, `wk`, …), or null. */
+  quota?: {
+    windows: { label: string; usedPercent: number; resetsAt: string | null }[];
+    asOf: string;
+  } | null;
   quotaPercent: number | null;
   full: boolean;
 };
@@ -683,14 +695,37 @@ export type AccountPin = {
   account: string;
   pinnedAt?: string;
 };
+/** One Cursor pool account — a Cursor API key, never the key itself; no quota. */
+export type CursorPoolAccount = Omit<CodexPoolAccount, "kind"> & { kind: "apikey" };
 export type AccountPool = {
   accounts: PoolAccount[];
   codex: CodexPoolAccount[];
+  /** Absent from a server older than the Cursor pool. */
+  cursor?: CursorPoolAccount[];
   /** Per tool; absent from an older server, empty in local mode. */
-  pins?: { claude: AccountPin[]; codex: AccountPin[] };
+  pins?: Partial<Record<PoolTool, AccountPin[]>>;
+  /** Server mode's pool groups; absent from an older server, empty in local mode. */
+  groups?: PoolGroup[];
   blockPercent: number;
 };
-export type PoolTool = "claude" | "codex";
+/**
+ * A pool group: its members (one group per user) run only on its accounts;
+ * a user in no group runs on the accounts no group lists (the shared pool).
+ */
+export type PoolGroup = {
+  id: number;
+  name: string;
+  createdAt?: string;
+  users: { userId: number; username: string }[];
+  accounts: Partial<Record<PoolTool, string[]>>;
+};
+/** What `PATCH /api/accounts/groups/:id` takes — every part optional. */
+export type PoolGroupPatch = {
+  name?: string;
+  userIds?: number[];
+  accounts?: Partial<Record<PoolTool, string[]>>;
+};
+export type PoolTool = "claude" | "codex" | "cursor";
 /** A saved switch-user profile that can be moved into the pool (no token). */
 export type PoolProfile = {
   name: string;
@@ -1182,6 +1217,24 @@ export const api = {
         method: "DELETE",
         body: JSON.stringify({ tool, currentPassword }),
       }),
+    /** POST /api/accounts/groups — admin: a new, empty pool group. */
+    createGroup: (name: string, currentPassword: string) =>
+      request<{ group: { id: number; name: string } }>("/accounts/groups", {
+        method: "POST",
+        body: JSON.stringify({ name, currentPassword }),
+      }),
+    /** PATCH /api/accounts/groups/:id — admin: each part given is set exactly. */
+    updateGroup: (id: number, body: PoolGroupPatch, currentPassword: string) =>
+      request<{ group: PoolGroup }>(`/accounts/groups/${id}`, {
+        method: "PATCH",
+        body: JSON.stringify({ ...body, currentPassword }),
+      }),
+    /** DELETE /api/accounts/groups/:id — its members go back to the shared pool. */
+    deleteGroup: (id: number, currentPassword: string) =>
+      request<{ ok: true }>(`/accounts/groups/${id}`, {
+        method: "DELETE",
+        body: JSON.stringify({ currentPassword }),
+      }),
   },
   // ───────────────────────── Updates / self-update API ─────────────────────────
   /** Self-update status: whether this install is a git clone and, if so,