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__/commit-message.test.js

@@ -82,6 +82,19 @@ describe("commit-message", () => {
     assert.doesNotMatch(input, /staged line/);
   });
 
+  it("with paths, reads exactly those files' working-tree changes, untracked included", async () => {
+    write("a.txt", "one\nticked edit\n");
+    write("new.txt", "brand new\n");
+    write("other.txt", "not ticked\n");
+    write(".claude/settings.local.json", '{"env":{"KEY":"sk-ticked"}}\n');
+    const input = await buildInput(REPO, ["a.txt", "new.txt", ".claude/settings.local.json"]);
+    assert.match(input, /ticked edit/);
+    assert.match(input, /brand new/);
+    assert.doesNotMatch(input, /not ticked|staged line|sk-ticked|settings\.local/);
+    await assert.rejects(buildInput(REPO, ["nope.txt"]), { code: "EBADPATH" });
+    await assert.rejects(buildInput(REPO, []), { code: "ENOSTAGED" });
+  });
+
   it("reports a failing or silent CLI as EAI", async () => {
     await assert.rejects(suggestCommitMessage(REPO, { bin: fakeClaude("boom", 1) }), {
       code: "EAI",