chore: v2.8.21 — update progress steps, clone in background, extra SSH keys inline, today's spend

- Plugin update reports its running step (plugin-update-progress.json →
  plugin_update_progress); a hidden update or clone leaves a progress chip.
- Clone here can run in the background.
- Git identity: extra SSH keys are added inline per host (no More keys tab).
- Users: spend today (viewer's local day, ?tz_offset=).
- Prettier on the files touched since v2.8.20.

client/src/pages/Users.tsx

@@ -3,8 +3,8 @@
  * @description The Users tab of the Administration page (`/admin`, which
  * `/users` redirects to — `Administration.tsx`), server mode only and
  * only for an admin or analyst (docs/SERVER-MODE.md): every account with its
- * role, state, workspaces, sessions, the tokens/$ it used in the last 7 and
- * 30 days (`GET /api/users`) and how much disk its home folder takes
+ * role, state, workspaces, sessions, the tokens/$ it used today (the
+ * browser's local day) and in the last 7 and 30 days (`GET /api/users`) and how much disk its home folder takes
  * (`GET /api/users/storage`, measured in the background — polled while the
  * server says `measuring`; Refresh re-measures), the audit log (`GET /api/users/audit`), and — for
  * an admin — add a user, and ONE Edit per row (`UserEditDialog`: profile,
@@ -214,13 +214,14 @@ export function Users({ embedded = false }: { embedded?: boolean } = {}) {
       )}
 
       <div className="card overflow-x-auto">
-        <table className="w-full min-w-[860px]" data-testid="users-table">
+        <table className="w-full min-w-[960px]" data-testid="users-table">
           <thead>
             <tr className="border-b border-border text-left">
               <th className={th}>{t("name")}</th>
               <th className={th}>{t("role")}</th>
               <th className={`${th} text-right`}>{t("workspaces")}</th>
               <th className={`${th} text-right`}>{t("sessions")}</th>
+              <th className={`${th} text-right`}>{t("today")}</th>
               <th className={`${th} text-right`}>{t("last7d")}</th>
               <th className={`${th} text-right`}>{t("last30d")}</th>
               <th className={`${th} text-right`}>{t("storage")}</th>
@@ -299,6 +300,7 @@ export function Users({ embedded = false }: { embedded?: boolean } = {}) {
                   <td className="px-5 py-3 text-right text-sm tabular-nums text-fg-secondary">
                     {u.sessions}
                   </td>
+                  <UsageCell usage={u.today ?? { cost: 0, tokens: 0 }} />
                   <UsageCell usage={u.last7d} />
                   <UsageCell usage={u.last30d} />
                   <StorageCell