fix(ui): ignore stale repo-picker fetch responses

apps/loopover-ui/src/components/site/app-panels/activation-preview.tsx

@@ -1,5 +1,5 @@
 import { CheckCircle2 } from "lucide-react";
-import { useCallback, useEffect, useMemo, useState } from "react";
+import { useCallback, useEffect, useMemo, useRef, useState } from "react";
 
 import { StatusPill, type Status } from "@/components/site/control-primitives";
 import { TableScroll } from "@/components/site/data-table";
@@ -61,13 +61,17 @@ export function ActivationPreview({ reviewability }: { reviewability: Array<{ pr
   const [preview, setPreview] = useState<ActivationPreviewResponse | null>(null);
   const [loading, setLoading] = useState(false);
   const [loadError, setLoadError] = useState<string | null>(null);
+  // Stale-response generation (#7784): ignore out-of-order resolutions when the free-text repo picker races.
+  const requestGenerationRef = useRef(0);
 
   const base = repoApiBase(repoFullName);
   const hasRepos = repoOptions.length > 0;
 
   const load = useCallback(async () => {
+    const generation = ++requestGenerationRef.current;
     const apiBase = repoApiBase(repoFullName);
     if (!apiBase) {
+      if (generation !== requestGenerationRef.current) return;
       setPreview(null);
       setLoadError(null);
       return;
@@ -79,6 +83,7 @@ export function ActivationPreview({ reviewability }: { reviewability: Array<{ pr
       credentials: "include",
       silentStatus: true,
     });
+    if (generation !== requestGenerationRef.current) return;
     if (result.ok) {
       setPreview(result.data);
     } else {

apps/loopover-ui/src/components/site/app-panels/ai-review-settings.tsx

@@ -1,5 +1,5 @@
 import { KeyRound, Loader2, Save, Trash2 } from "lucide-react";
-import { useCallback, useEffect, useMemo, useState } from "react";
+import { useCallback, useEffect, useMemo, useRef, useState } from "react";
 import { StatusPill } from "@/components/site/control-primitives";
 import { apiFetch } from "@/lib/api/request";
 import { getApiOrigin } from "@/lib/api/origin";
@@ -57,11 +57,14 @@ export function AiReviewSettings({ reviewability }: { reviewability: Array<{ pr:
   const [busy, setBusy] = useState(false);
   const [loading, setLoading] = useState(false);
   const [message, setMessage] = useState<Message | null>(null);
+  // Stale-response generation (#7784): ignore out-of-order resolutions when the free-text repo picker races.
+  const requestGenerationRef = useRef(0);
 
   const base = repoApiBase(repoFullName);
   const hasRepos = repoOptions.length > 0;
 
   const load = useCallback(async () => {
+    const generation = ++requestGenerationRef.current;
     const apiBase = repoApiBase(repoFullName);
     if (!apiBase) return;
     setMessage(null);
@@ -78,6 +81,7 @@ export function AiReviewSettings({ reviewability }: { reviewability: Array<{ pr:
         silentStatus: true,
       }),
     ]);
+    if (generation !== requestGenerationRef.current) return;
     if (settings.ok) {
       setMode(settings.data.aiReviewMode ?? "off");
       setByok(settings.data.aiReviewByok ?? false);

apps/loopover-ui/src/components/site/app-panels/ams-miner-cohort-card.test.tsx

@@ -139,4 +139,41 @@
     });
     expect(screen.getByText(/This view is unavailable for this repository\./i)).toBeTruthy();
   });
+
+  it("ignores a stale response after the free-text repo picker races (#7784)", async () => {
+    let resolveFirst!: (value: { ok: true; data: typeof POPULATED_COMPARISON }) => void;
+    const first = new Promise<{ ok: true; data: typeof POPULATED_COMPARISON }>((resolve) => {
+      resolveFirst = resolve;
+    });
+    const secondComparison = {
+      ...POPULATED_COMPARISON,
+      windowDays: 30,
+      checkedSubmitterCount: 2,
+      amsCohort: { ...POPULATED_COMPARISON.amsCohort, submitterCount: 9 },
+    };
+    apiFetch.mockImplementation((url: string) => {
+      if (String(url).includes("/acme/widgets/")) return first;
+      return Promise.resolve({ ok: true, data: secondComparison });
+    });
+
+    render(
+      <AmsMinerCohortCard
+        reviewability={[{ pr: "acme/widgets#1" }, { pr: "other/repo#2" }]}
+      />,
+    );
+    // Initial load for acme/widgets is in flight (deferred). Type a different repo so a newer request starts.
+    fireEvent.change(screen.getByPlaceholderText("owner/repo"), {
+      target: { value: "other/repo" },
+    });
+    await waitFor(() => expect(screen.getByText(/Window: 30 days · checked 2 of/i)).toBeTruthy());
+
+    // Stale first response arrives late — must not overwrite the newer repo's state.
+    resolveFirst({ ok: true, data: POPULATED_COMPARISON });
+    await waitFor(() => expect(apiFetch).toHaveBeenCalledWith(
+      expect.stringContaining("/v1/repos/other/repo/ams-miner-cohort"),
+      expect.anything(),
+    ));
+    expect(screen.getByText(/Window: 30 days · checked 2 of/i)).toBeTruthy();
+    expect(screen.queryByText(/Window: 90 days · checked 5 of/i)).toBeNull();
+  });
 });

apps/loopover-ui/src/components/site/app-panels/ams-miner-cohort-card.tsx

@@ -1,4 +1,4 @@
-import { useCallback, useEffect, useState } from "react";
+import { useCallback, useEffect, useRef, useState } from "react";
 
 import { StateBoundary } from "@/components/site/state-views";
 import { apiFetch } from "@/lib/api/request";
@@ -94,13 +94,18 @@ export function AmsMinerCohortCard({ reviewability }: { reviewability: Array<{ p
   const [comparison, setComparison] = useState<AmsMinerCohortComparison | null>(null);
   const [loading, setLoading] = useState(false);
   const [loadError, setLoadError] = useState<string | null>(null);
+  // Stale-response generation (#7784): every keystroke that changes repoFullName bumps this; a response
+  // whose generation no longer matches is ignored so an earlier in-flight fetch can't overwrite later state.
+  const requestGenerationRef = useRef(0);
 
   const base = repoApiBase(repoFullName);
   const hasRepos = repoOptions.length > 0;
 
   const load = useCallback(async () => {
+    const generation = ++requestGenerationRef.current;
     const apiBase = repoApiBase(repoFullName);
     if (!apiBase) {
+      if (generation !== requestGenerationRef.current) return;
       setComparison(null);
       setLoadError(null);
       return;
@@ -112,6 +117,7 @@ export function AmsMinerCohortCard({ reviewability }: { reviewability: Array<{ p
       credentials: "include",
       silentStatus: true,
     });
+    if (generation !== requestGenerationRef.current) return;
     if (result.ok) {
       setComparison(result.data);
     } else {

apps/loopover-ui/src/components/site/app-panels/maintainer-settings.tsx

@@ -1,5 +1,5 @@
 import { FileCog, Loader2, Save } from "lucide-react";
-import { useCallback, useEffect, useMemo, useState } from "react";
+import { useCallback, useEffect, useMemo, useRef, useState } from "react";
 
 import { apiFetch } from "@/lib/api/request";
 import { getApiOrigin } from "@/lib/api/origin";
@@ -141,11 +141,14 @@ export function MaintainerSettings({ reviewability }: { reviewability: Array<{ p
   const [loading, setLoading] = useState(false);
   const [busy, setBusy] = useState(false);
   const [message, setMessage] = useState<Message | null>(null);
+  // Stale-response generation (#7784): ignore out-of-order resolutions when the free-text repo picker races.
+  const requestGenerationRef = useRef(0);
 
   const base = repoApiBase(repoFullName);
   const hasRepos = repoOptions.length > 0;
 
   const load = useCallback(async () => {
+    const generation = ++requestGenerationRef.current;
     const apiBase = repoApiBase(repoFullName);
     if (!apiBase) return;
     setMessage(null);
@@ -155,6 +158,7 @@ export function MaintainerSettings({ reviewability }: { reviewability: Array<{ p
       credentials: "include",
       silentStatus: true,
     });
+    if (generation !== requestGenerationRef.current) return;
     // Default the agent-layer fields defensively so the editor renders even against an older response shape.
     setSettings(
       result.ok
@@ -519,8 +523,11 @@ function FocusManifestEditor({ base }: { base: string | null }) {
   const [loading, setLoading] = useState(false);
   const [busy, setBusy] = useState(false);
   const [message, setMessage] = useState<Message | null>(null);
+  // Stale-response generation (#7784): ignore out-of-order resolutions when `base` changes mid-flight.
+  const requestGenerationRef = useRef(0);
 
   const load = useCallback(async () => {
+    const generation = ++requestGenerationRef.current;
     if (!base) return;
     setLoading(true);
     setMessage(null);
@@ -529,6 +536,7 @@ function FocusManifestEditor({ base }: { base: string | null }) {
       credentials: "include",
       silentStatus: true,
     });
+    if (generation !== requestGenerationRef.current) return;
     setText(result.ok ? JSON.stringify(result.data.manifest, null, 2) : "");
     setLoading(false);
   }, [base]);