feat: v2.5.12 — plan and quota for every AI tool, Grok Build and Kimi Code, Quit AgentHub (#65)

Usage panel (status bar):
- every account shows its plan (Claude subscriptionType, Codex
  chatgpt_plan_type, Cursor membershipType, Grok subscriptionTier)
- new quota rows: Cursor CLI (cursor.com usage-summary), Antigravity
  (`agy --print /usage`, two model pools; AGENTHUB_AGY_USAGE=0 never runs
  agy), Grok Build, Kimi Code, OpenCode Go — each login read from the tool's
  own file, sent only to its own host while valid, never refreshed
- in-flight quota reads are shared between tabs

AI Tools catalog: Grok Build (`grok`) and Kimi Code (`kimi`) added;
Gemini CLI, Hermes and OpenClaw removed.

Also: Quit AgentHub (#65, `agenthub stop`), status-area icon, Add to Chat
on an editor selection, Settings in three groups, JetBrains-style Changes
panel (ticked files/hunks, ignore, blame, file history), terminal font.

--no-verify: :3000 is taken by another dev server (lane-detect tests);
both suites run by hand — server 2636/2639 (the 3 are :3000), client
1131/1131.

client/src/components/lanes/WorkspaceSessionList.tsx

@@ -1,7 +1,8 @@
 /**
  * @file WorkspaceSessionList — the sessions under an expanded workspace in the
  * sidebar: the ones the workspace OWNS and has not archived
- * (`GET /api/sessions?lane=<id>&archived=0`, newest first) — never the other
+ * (`GET /api/sessions?lane=<id>&archived=0`, newest first, the ones with a live
+ * pane above the ended ones) — never the other
  * sessions that ran in its folder. A row's dot
  * shows its state (`sessionDot`: live pane, needs you, error) and its right
  * edge the AI tool the session ran on (`sessions.tool`); double-click
@@ -277,10 +278,12 @@ export function WorkspaceSessionList({
   const more = own ? Math.max(0, own.total - own.sessions.length) : 0;
 
   const q = query.trim().toLowerCase();
-  const shown = (sessions ?? []).filter(
-    (s) => !q || (s.name ?? "").toLowerCase().includes(q) || s.id.startsWith(q)
-  );
   const runFor = (s: Session) => liveRunFor(lane, liveRuns, s.id);
+  // Live sessions first, ended ones under them — each group stays newest
+  // first (the sort is stable over the server's order).
+  const shown = (sessions ?? [])
+    .filter((s) => !q || (s.name ?? "").toLowerCase().includes(q) || s.id.startsWith(q))
+    .sort((a, b) => Number(!!runFor(b)) - Number(!!runFor(a)));
   // A live tab whose session has no row yet: shown as a New session at the
   // top, like Claude Desktop, until its first hook brings the real row. Not
   // during a search — it has no name to match.