test(web): pooled Limits segments narrower than 6px draw no pace mark; fixture README

apps/web/src/components/usage/UsageLimitsPooled.browser.test.tsx

@@ -194,6 +194,26 @@ it("cuts the pace gap through the segment track and keeps the tick inside it", a
   expect(tick.right).toBeLessThanOrEqual(rect.right);
 });
 
+it("drops the pace gap and tick when a segment is narrower than 6px", async () => {
+  setup();
+  await using _screen = await render(
+    <UsageLimitsPooled
+      presentations={presentations("2026-09-03T14:00:00Z", 0)}
+      now={Date.parse("2026-09-03T11:30:00Z")}
+    />,
+  );
+  const segment = page.getByRole("button", { name: /^Alpha:/ }).element();
+  const tick = () => segment.querySelector(':scope > span[style*="left"]');
+  expect(tick()).not.toBeNull();
+  // Pooled grid columns have no minimum width; squeeze the segment the way a crowded pool does.
+  await act(() => {
+    segment.style.width = "4.5px";
+  });
+  await expect.poll(tick).toBeNull();
+  expect(getComputedStyle(segment).backgroundImage).toBe("none");
+  expect(getComputedStyle(segment.querySelector(":scope > div > div")!).clipPath).toBe("none");
+});
+
 it("moves the one limit popover between windows on hover", async () => {
   setup();
   await using screen = await render(initial());

apps/web/test/fixtures/usage-limits-hub/README.md

@@ -1,8 +1,65 @@
 # Usage limits hub fixture
 
-A fake CLIProxyAPI hub that serves the Limits evidence scenarios in `scenarios.json`
-(A mixed, B one account per provider, C six long-named Codex accounts, L named accounts,
-T forty accounts). Run `node hub.mjs state.json 18517` with `state.json` set to
-`{"scenario": "A", "n0": <epoch ms>}`, add `http://127.0.0.1:18517` with any management key
-under Settings → Usage limit sources in a dev server, and freeze the browser clock at `n0`.
-Edit `state.json` and press Refresh limits to switch scenarios.
+A fake CLIProxyAPI hub that serves the Limits evidence scenarios in `scenarios.json`:
+
+| Scenario | Accounts                                                       |
+| -------- | -------------------------------------------------------------- |
+| A        | mixed Codex and Claude accounts                                |
+| B        | one account per provider                                       |
+| C        | six long-email Codex accounts                                  |
+| L        | named accounts (no email, so segments show the auth-file name) |
+| T        | forty accounts, so pooled segments are 4px wide at 390px       |
+
+Reset times are minute offsets from `n0`.
+
+## Rebuild a capture
+
+1. Start a dev server with empty provider homes, so local logins add no accounts:
+
+   ```sh
+   CODEX_HOME=$(mktemp -d) CLAUDE_CONFIG_DIR=$(mktemp -d) vp run dev
+   ```
+
+2. Write `state.json` as `{"scenario": "A", "n0": 1792515540000}`. That `n0` is 2026-10-20T16:59:00Z, the instant every published capture uses. Then start the hub:
+
+   ```sh
+   node hub.mjs state.json 18517
+   ```
+
+3. Under Settings → Providers → Usage limit sources, add a hub with URL `http://127.0.0.1:18517`, any management key, and label `Team hub`. The composer panel prints that label on every account row.
+
+4. Freeze the browser clock at `n0` from the devtools console:
+
+   ```js
+   const T = 1792515540000;
+   const R = Date;
+   window.Date = class extends R {
+     constructor(...a) {
+       super(...(a.length ? a : [T]));
+     }
+     static now() {
+       return T;
+     }
+   };
+   ```
+
+   Then re-read the time:
+   - On the Usage page, select Cost and then Limits again.
+   - Open the composer panel with `/usage-limits` after freezing.
+   - The sidebar's relative timestamp picks up the frozen clock on its next minute tick.
+
+5. Viewports and themes: emulate `prefers-color-scheme` light and dark, and wait a few seconds after switching theme or size so transitions and overlay scrollbars settle.
+
+   | Surface                                         | Viewport                              |
+   | ----------------------------------------------- | ------------------------------------- |
+   | Usage page                                      | 1440×900 and 390×1500                 |
+   | Scenario T                                      | 390×3100, so the page does not scroll |
+   | Composer panel, Codex thread (`gpt-6-astra`)    | 1440×900                              |
+   | Composer panel, Claude thread (Claude Opus 5.5) | 390×1300                              |
+
+6. Edit `state.json` and press Refresh limits to switch scenarios.
+
+## Not from the fixture
+
+- **"Codex: Could not read limits."** That banner comes from the local Codex install, which is unauthenticated with an empty `CODEX_HOME`.
+- **"Claude API Key" rows** in the Claude composer panel come from the local Claude install, not the fixture.