fix(ui): explain connection pool quota waits

Co-Authored-By: Paperclip <noreply@paperclip.ing>

ui/src/components/IssueMonitorBanner.test.tsx

@@ -158,6 +158,21 @@ describe("IssueMonitorBanner / IssueMonitorComposerStrip rendering", () => {
     flushSync(() => root.unmount());
   });
 
+  it("explains pool exhaustion and retained account affinity on both waiting surfaces", () => {
+    const issue = {
+      status: "in_progress", scheduledRetry: { status: "scheduled_retry", scheduledRetryReason: "ai_connection_pool_wait", scheduledRetryAt: new Date(NOW.getTime() + 60_000).toISOString(), scheduledRetryAttempt: 1 },
+    } as Issue;
+    const root = createRoot(container);
+    flushSync(() => root.render(<><IssueMonitorBanner issue={issue} onCheckNow={vi.fn()} /><IssueMonitorComposerStrip issue={issue} onCheckNow={vi.fn()} /></>));
+    expect(container.textContent).toContain("Pool exhausted");
+    expect(container.textContent).toContain("Usage recheck in 1m");
+    expect(container.textContent).toContain("This task keeps its account");
+    expect(container.textContent).toContain("The selected account stays pinned.");
+    expect(container.textContent).not.toContain("Attempt 1");
+    expect(container.querySelector("button")).not.toBeNull();
+    flushSync(() => root.unmount());
+  });
+
   it("renders the banner with a working Check now button while waiting", () => {
     const onCheckNow = vi.fn();
     expect(hasVisibleMonitorSurface(issueWithMonitor(new Date(NOW.getTime() + 2 * 60 * 60_000).toISOString()))).toBe(true);

ui/src/components/IssueMonitorBanner.tsx

@@ -81,6 +81,16 @@ export function buildMonitorSurfaceCopy(
 
   const eta = formatMonitorEta(derived.nextCheckAt, now); // "in 2h 12m" | "due now" | "overdue by 18m"
   const absolute = formatMonitorAbsolute(derived.nextCheckAt, {}, now); // local time, e.g. "Today, 4:08 PM"
+  if (derived.source === "scheduled-retry" && scheduledRetryReason === "ai_connection_pool_wait") {
+    return {
+      bannerTitle: "Pool exhausted",
+      stripTitle: "Pool exhausted",
+      bannerMeta: [`Usage recheck ${eta} · ${absolute} (your time)`, "This task keeps its account and resumes when usage permits."],
+      stripMeta: [`Usage recheck ${eta} · ${absolute}`, "The selected account stays pinned."],
+      tone: "info",
+    };
+  }
+
   const isScheduledRetryOnly = derived.source === "scheduled-retry";
 
   let bannerTitle: string;