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.

server/__tests__/pets.test.js

@@ -146,6 +146,16 @@ describe("importing a .codex-pet bundle", () => {
     assert.equal(r.status, 201);
   });
 
+  it("accepts a v2 sheet (1536×2288, the 16 gaze poses in rows 9–10)", async () => {
+    const r = await request("POST", "/api/pets/import", {
+      body: bundle({
+        "pet.json": { spriteVersionNumber: 2 },
+        "spritesheet.webp": webp(1536, 2288),
+      }),
+    });
+    assert.equal(r.status, 201);
+  });
+
   it("refuses a bundle missing a file, a sheet of the wrong size, and a non-zip", async () => {
     const missing = await request("POST", "/api/pets/import", { body: bundle({ "pet.json": {} }) });
     assert.equal(missing.status, 400);