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__/pty-run.test.js

@@ -651,7 +651,7 @@ describe("pty-run", () => {
     let savedPath;
     before(() => {
       fs.mkdirSync(BIN, { recursive: true });
-      for (const name of ["agy", "gemini", "grok", "goose", "command-code"]) {
+      for (const name of ["agy", "grok", "goose", "command-code"]) {
         fs.writeFileSync(path.join(BIN, name), "#!/bin/sh\n");
         fs.chmodSync(path.join(BIN, name), 0o755);
       }
@@ -734,15 +734,11 @@ describe("pty-run", () => {
             pty.spawnRun({ laneId: 15, cwd: "/tmp/repo", tool, initialPrompt: "-x y", ...extra })
           )
         );
-      assert.deepEqual(argvFor("gemini"), [at("gemini"), "--prompt-interactive", " -x y"]);
+      assert.deepEqual(argvFor("antigravity"), [at("agy"), "-i", " -x y"]);
       // Behind a `--` separator the prompt is already a positional, kept as typed.
       assert.deepEqual(argvFor("grok"), [at("grok"), "--", "-x y"]);
       assert.deepEqual(argvFor("command-code"), [at("command-code"), "--trust", " -x y"]);
-      assert.deepEqual(argvFor("gemini", { bypass: false }), [
-        at("gemini"),
-        "--prompt-interactive",
-        " -x y",
-      ]);
+      assert.deepEqual(argvFor("antigravity", { bypass: false }), [at("agy"), "-i", " -x y"]);
     });
 
     it("pastes an after-start prompt later and adds bypassEnv only on bypass", (t) => {