Gateway: keep finished threads in Recent until settled, with a full list and settle-all route

gateway/test/views.test.ts

@@ -140,7 +140,6 @@ describe("routeKind", () => {
 });
 
 describe("buildFeed", () => {
-  const now = Date.parse("2026-11-01T09:30:00.000Z");
   const host = (label: string, threads: ThreadShell[]) =>
     ({
       id: label,
@@ -164,7 +163,6 @@ describe("buildFeed", () => {
         ]),
       ],
       new SummaryCache(),
-      now,
     );
     expect(feed.working).toEqual([]);
     expect(feed.needsYou.map((item) => [item.threadId, item.phase, item.via])).toEqual([
@@ -182,11 +180,20 @@ describe("buildFeed", () => {
         ]),
       ],
       new SummaryCache(),
-      now,
     );
     expect(feed.needsYou.map((item) => [item.threadId, item.via?.threadId ?? null])).toEqual([
       ["parent", "first"],
       ["later", null],
     ]);
   });
+
+  it("keeps finished threads in Recent until they are settled, however old", async () => {
+    const old = (id: string, day: number) => thread({ id, status: "completed", updatedAt: `2026-10-${day}T09:00:00.000Z` });
+    const feed = await buildFeed(
+      [host("Desktop", [...Array.from({ length: 11 }, (_, i) => old(`t${i}`, 10 + i)), { ...old("done", 29), settledOverride: "settled" }])],
+      new SummaryCache(),
+    );
+    expect(feed.recent.map((item) => item.threadId)).toEqual(["t10", "t9", "t8", "t7", "t6", "t5", "t4", "t3", "t2", "t1"]);
+    expect(feed.recentTotal).toBe(11);
+  });
 });