Prevent Android chats from freezing or going blank (#1989)

* fix(app): stabilize streamed chat rendering

Use deterministic Markdown AST keys and preserve unique row identities when an assistant message resumes after a tool. Keep native gesture and plan-card children correctly keyed to avoid unsupported Fabric reconciliation paths.

* fix(app): stabilize retained native panels

Keep retained workspace roots in a stable native order and make active
panels present in the selection commit. Hidden panels now stop expensive
subscriptions and animations without losing mounted state.

* fix(app): harden retained panel activity

packages/app/src/hooks/sidebar-workspaces-view-model.test.ts

@@ -4,7 +4,7 @@ import type { WorkspaceStructureProject } from "@/projects/workspace-structure";
 import {
   appendMissingOrderKeys,
   applyStoredOrdering,
-  buildSidebarStatusWorkspacePlacements,
+  buildSidebarWorkspaceEntries,
   buildSidebarWorkspacePlacementModel,
   buildSidebarProjectsFromStructure,
   computeSidebarOrderUpdates,
@@ -226,7 +226,7 @@ describe("shared sidebar workspace model", () => {
         }),
       ],
     });
-    const statusRows = buildSidebarStatusWorkspacePlacements({
+    const workspaceEntries = buildSidebarWorkspaceEntries({
       placements: model.workspaces,
       sessions: [
         {
@@ -290,14 +290,66 @@ describe("shared sidebar workspace model", () => {
         ],
       }),
     ]);
-    expect(statusRows.map((entry) => [entry.workspaceKey, entry.statusBucket, entry.name])).toEqual(
-      [
-        ["host-a:main", "done", "main"],
-        ["host-b:feature", "running", "feature/status-flow"],
-      ],
-    );
+    expect(
+      Array.from(workspaceEntries.values()).map((entry) => [
+        entry.workspaceKey,
+        entry.statusBucket,
+        entry.name,
+      ]),
+    ).toEqual([
+      ["host-a:main", "done", "main"],
+      ["host-b:feature", "running", "feature/status-flow"],
+    ]);
     expect(model.projectNamesByKey).toEqual(new Map([["getpaseo/paseo", "getpaseo/paseo"]]));
   });
+
+  it("preserves unchanged row identities when another workspace updates", () => {
+    const model = buildSidebarWorkspacePlacementModel({
+      projects: [project({ projectKey: "project", workspaceKeys: ["srv:one", "srv:two"] })],
+    });
+    const one = workspace({
+      id: "one",
+      name: "one",
+      projectId: "project",
+      projectDisplayName: "project",
+    });
+    const two = workspace({
+      id: "two",
+      name: "two",
+      projectId: "project",
+      projectDisplayName: "project",
+    });
+    const previousEntries = buildSidebarWorkspaceEntries({
+      placements: model.workspaces,
+      sessions: [
+        {
+          serverId: "srv",
+          workspaceAgentActivity: new Map(),
+          workspaces: new Map([
+            ["one", one],
+            ["two", two],
+          ]),
+        },
+      ],
+    });
+    const nextEntries = buildSidebarWorkspaceEntries({
+      placements: model.workspaces,
+      sessions: [
+        {
+          serverId: "srv",
+          workspaceAgentActivity: new Map(),
+          workspaces: new Map([
+            ["one", one],
+            ["two", { ...two, status: "running" }],
+          ]),
+        },
+      ],
+      previousEntries,
+    });
+
+    expect(nextEntries.get("srv:one")).toBe(previousEntries.get("srv:one"));
+    expect(nextEntries.get("srv:two")).not.toBe(previousEntries.get("srv:two"));
+  });
 });
 
 describe("shouldShowSidebarHostLabels", () => {