feat: restrict the queue and logs links on merge-queue batch PRs

Batch PRs get a reduced link set: the logs link is dropped (event logs are not
supported for batches yet), and the queue link is shown only while the batch PR
is open — once it closes the batch has drained out of the queue, so the deep
link has nothing to open. An open batch PR keeps the batch_pr queue deep-link;
other PRs are unchanged.

A closed batch PR loses its Draft pill, so it is recognized by Mergify authorship
instead; this also covers closed Mergify config/backport PRs, whose queue and
logs links point nowhere useful either. The gating is centralized in
appendBatchAwareLinks(), shared by the default/rich and sidebar rows.

MRGFY-7878

Test plan:
- npx jest (278 passing) — open batch PR (queue=batch_pr, no logs), closed batch
  PR (neither link), open non-batch PR (both links), closed human PR unaffected.
- npx biome check — clean.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_015qcXJDQnrrJU4Xu6BxmQz8
Change-Id: I23862d88938847449dc1a1ed7b7ed86f9cef3811

Author: JulianMaurin

src/__tests__/queue.test.js

@@ -674,12 +674,14 @@ const {
 } = require("../queue");
 const { injectFixtureInDOM } = require("./utils");
 
-// Minimal PR-page DOM: a draft status pill, the header-meta author link, and
-// the classic base-ref span. Any argument left undefined is omitted so a test
-// can exercise a single missing piece.
-function setPrDom({ draft, author, baseRef } = {}) {
+// Minimal PR-page DOM: a status pill (draft/closed), the header-meta author
+// link, and the classic base-ref span. Any argument left undefined is omitted
+// so a test can exercise a single missing piece.
+function setPrDom({ draft, closed, author, baseRef } = {}) {
     const parts = [];
     if (draft) parts.push('<span class="State" title="Status: Draft"></span>');
+    else if (closed)
+        parts.push('<span class="State" title="Status: Closed"></span>');
     if (author) {
         const href = author === "mergify" ? "/apps/mergify" : `/${author}`;
         parts.push(
@@ -882,3 +884,54 @@ describe("batch-PR row treatment", () => {
         }
     });
 });
+
+describe("batch-PR informational links", () => {
+    beforeEach(() => {
+        document.body.innerHTML = "";
+        window.history.replaceState({}, "", "/acme/widget/pull/42");
+    });
+    afterEach(() => {
+        document.body.innerHTML = "";
+    });
+
+    // The informational-link labels ("queue"/"logs"), excluding the Mergify
+    // brand anchor (whose textContent carries the inlined logo SVG).
+    function linkLabels(row) {
+        return [...row.querySelectorAll("a")]
+            .map((a) => a.textContent.trim())
+            .filter((t) => t === "queue" || t === "logs");
+    }
+    function queueHrefOf(row) {
+        return [...row.querySelectorAll("a")]
+            .find((a) => a.textContent.trim() === "queue")
+            ?.getAttribute("href");
+    }
+
+    test("open batch PR: queue link deep-links via batch_pr, no logs link", () => {
+        setPrDom({ draft: true, author: "mergify", baseRef: "develop" });
+        const row = buildMergifyRow();
+        expect(linkLabels(row)).toEqual(["queue"]);
+        expect(queueHrefOf(row)).toBe(
+            "https://dashboard.mergify.com/queues/status?login=acme&repository=widget&branch=develop&batch_pr=42",
+        );
+    });
+
+    test("closed batch PR: no queue link and no logs link", () => {
+        setPrDom({ closed: true, author: "mergify" });
+        const row = buildMergifyRow();
+        expect(linkLabels(row)).toEqual([]);
+    });
+
+    test("open non-batch PR keeps both the queue and logs links", () => {
+        setPrDom({ author: "octocat", baseRef: "develop" });
+        const row = buildMergifyRow();
+        expect(linkLabels(row)).toEqual(["queue", "logs"]);
+        expect(queueHrefOf(row)).toContain("pull-request-number=42");
+    });
+
+    test("closed human PR is unaffected — keeps both links", () => {
+        setPrDom({ closed: true, author: "octocat" });
+        const row = buildMergifyRow();
+        expect(linkLabels(row)).toEqual(["queue", "logs"]);
+    });
+});

src/queue.js

@@ -165,6 +165,17 @@ export function isMergeQueueBatchPr() {
     return isPullRequestDraft() && isPullRequestAuthoredByMergify();
 }
 
+// A batch PR page for the purpose of the informational links. While open a
+// batch PR is a draft (isMergeQueueBatchPr); once closed the draft pill is gone,
+// so fall back to Mergify authorship. This also matches closed Mergify
+// config/backport PRs, whose queue and logs links point nowhere useful anyway.
+export function isBatchPrContext() {
+    return (
+        isMergeQueueBatchPr() ||
+        (!isPullRequestOpen() && isPullRequestAuthoredByMergify())
+    );
+}
+
 export function wasMergedByMergify() {
     const timelineItems = document.querySelectorAll(".TimelineItem");
     for (const item of timelineItems) {
@@ -521,6 +532,21 @@ function appendCommandButtons(container) {
     }
 }
 
+// Append the queue and logs links via the caller's appendLink(href, text, svg),
+// honoring batch-PR restrictions: the queue link points at the batch peek
+// drawer while the batch PR is open and is dropped once it closes (the batch
+// has drained — nothing to open); the logs link is omitted on batch PRs
+// entirely (not supported for batches yet).
+function appendBatchAwareLinks(appendLink) {
+    const batch = isBatchPrContext();
+    if (!batch || isPullRequestOpen()) {
+        appendLink(getMergeQueueLink(), "queue", QUEUE_ICON_SVG);
+    }
+    if (!batch) {
+        appendLink(getEventLogLink(), "logs", LOGS_ICON_SVG);
+    }
+}
+
 export function getEventLogLink() {
     const data = getPullRequestData();
     return `https://dashboard.mergify.com/event-logs?login=${data.org}&repository=${data.repo}&pullRequestNumber=${data.pull}`;
@@ -652,8 +678,7 @@ function buildLegacySidebarRow() {
         link.appendChild(document.createTextNode(text));
         links.appendChild(link);
     }
-    appendLink(getMergeQueueLink(), "queue", QUEUE_ICON_SVG);
-    appendLink(getEventLogLink(), "logs", LOGS_ICON_SVG);
+    appendBatchAwareLinks(appendLink);
     if (state === "merged") {
         const status = document.createElement("span");
         status.style.color = "var(--fgColor-muted, #7d8590)";
@@ -957,8 +982,7 @@ function buildBrandAndLinks() {
         link.appendChild(document.createTextNode(text));
         info.appendChild(link);
     }
-    appendLink(getMergeQueueLink(), "queue", QUEUE_ICON_SVG);
-    appendLink(getEventLogLink(), "logs", LOGS_ICON_SVG);
+    appendBatchAwareLinks(appendLink);
 
     const brand = document.createElement("a");
     brand.href = "https://dashboard.mergify.com";