Patch folder realtime threads locally

tests/android-folder-realtime-refresh.test.ts

@@ -23,4 +23,14 @@ test("android folder activity refreshes on matching device-scoped conversation u
     /payloadDeviceId\.equals\(folderDeviceId\)/,
     "expected folder activity to reload when the event targets its device",
   );
+  assert.match(
+    source,
+    /tryApplyFolderRealtimePatch\(event\)/,
+    "expected folder activity to try a local thread-row patch before falling back to network reload",
+  );
+  assert.match(
+    source,
+    /threadConversationItem/,
+    "expected folder activity to read the direct thread item patch from realtime payloads",
+  );
 });

tests/conversation-home-items.test.ts

@@ -9,6 +9,7 @@ let readState: (typeof import("../src/lib/boss-data"))["readState"];
 let updateConversationAction: (typeof import("../src/lib/boss-data"))["updateConversationAction"];
 let getConversationHomeItems: (typeof import("../src/lib/boss-projections"))["getConversationHomeItems"];
 let getConversationHomeItemForProject: (typeof import("../src/lib/boss-projections"))["getConversationHomeItemForProject"];
+let getConversationThreadItemForProject: (typeof import("../src/lib/boss-projections"))["getConversationThreadItemForProject"];
 let getConversationFolderView: (typeof import("../src/lib/boss-projections"))["getConversationFolderView"];
 let formatTimestampLabel: (typeof import("../src/lib/boss-projections"))["formatTimestampLabel"];
 let getConversationListItemPresentation: (typeof import("../src/components/app-ui"))["getConversationListItemPresentation"];
@@ -30,6 +31,7 @@ async function setup() {
   updateConversationAction = data.updateConversationAction;
   getConversationHomeItems = projections.getConversationHomeItems;
   getConversationHomeItemForProject = projections.getConversationHomeItemForProject;
+  getConversationThreadItemForProject = projections.getConversationThreadItemForProject;
   getConversationFolderView = projections.getConversationFolderView;
   formatTimestampLabel = projections.formatTimestampLabel;
   getConversationListItemPresentation = ui.getConversationListItemPresentation;
@@ -233,6 +235,40 @@ test("conversation home patch lookup returns the direct thread item when no fold
   assert.equal(item?.projectId, "solo-thread");
 });
 
+test("conversation thread patch lookup keeps the direct single-thread item for grouped folders", async () => {
+  await setup();
+  const state = await readState();
+
+  state.projects = state.projects.filter((project) => project.id === "master-agent");
+  state.projects.push(
+    buildImportedThreadProject(
+      "mac-studio",
+      "boss-thread-a",
+      "Boss",
+      "boss",
+      "线程 A",
+      "thread-a",
+      "2026-04-04T12:00:00+08:00",
+    ),
+    buildImportedThreadProject(
+      "mac-studio",
+      "boss-thread-b",
+      "Boss",
+      "boss",
+      "线程 B",
+      "thread-b",
+      "2026-04-04T11:00:00+08:00",
+    ),
+  );
+
+  const item = getConversationThreadItemForProject(state, "boss-thread-b");
+
+  assert.ok(item, "expected grouped thread lookup to resolve to its direct thread row");
+  assert.equal(item?.conversationType, "single_device");
+  assert.equal(item?.projectId, "boss-thread-b");
+  assert.equal(item?.folderKey, "mac-studio:boss");
+});
+
 test("folder archive context ring prefers more urgent contextBudgetLevel when mustFinishBeforeCompaction is equal", async () => {
   await setup();
   const state = await readState();

tests/conversation-realtime-patch.test.ts

@@ -19,6 +19,11 @@ test("events route enriches project conversation events with a visible home item
     /conversationItem:\s*getConversationHomeItemForProject\(state,\s*String\(payload\.projectId \?\? ""\)\)/,
     "expected enriched event payload to carry a conversation item slot",
   );
+  assert.match(
+    source,
+    /threadConversationItem:\s*getConversationThreadItemForProject\(state,\s*String\(payload\.projectId \?\? ""\)\)/,
+    "expected enriched event payload to carry a direct thread item slot for folder pages",
+  );
 });
 
 test("MainActivity applies realtime conversation patches without forcing a network refresh", async () => {