Keep the active project when switching workspace hosts (#3051)

* fix(app): preserve projects across host switches

New workspace entry context retained only a host-local placement, so switching hosts could replace the selected project with the destination's first project. Hydrate that placement against canonical project identity while keeping exact clone placement separate.

* fix(app): preserve manual project choice during hydration

Keep the raw route placement key as stable selection context while hydrating the routed project to its canonical identity.

packages/app/src/projects/host-project-model.ts

@@ -71,7 +71,7 @@ export function hostProjectFromWorkspace(input: {
       serverId: input.serverId,
       projectId,
     }),
-    projectKey: null,
+    projectKey: input.workspace.project?.projectKey ?? null,
     projectName: input.workspace.projectDisplayName || projectId,
     projectKind: input.workspace.projectKind,
     iconWorkingDir,

packages/app/src/projects/host-projects.test.ts

@@ -6,7 +6,9 @@ import {
   getHostProjectSourceDirectory,
   getWorktreeSupportForHostProject,
   hostProjectFromRoute,
+  hostProjectFromWorkspace,
 } from "./host-project-model";
+import { normalizeWorkspaceDescriptor } from "@/stores/session-store";
 
 function project(): HostProjectListItem {
   return {
@@ -95,4 +97,42 @@ describe("host project lookups", () => {
       hosts: [{ serverId: "host-a", projectId: "prj_a" }],
     });
   });
+
+  test("keeps canonical equivalence identity separate from host placement identity", () => {
+    const workspace = normalizeWorkspaceDescriptor({
+      id: "workspace-a",
+      projectId: "project-a",
+      projectDisplayName: "App",
+      projectRootPath: "/repo/app",
+      workspaceDirectory: "/repo/app",
+      projectKind: "git",
+      workspaceKind: "local_checkout",
+      name: "main",
+      archivingAt: null,
+      status: "done",
+      statusEnteredAt: null,
+      activityAt: null,
+      diffStat: null,
+      scripts: [],
+      project: {
+        projectKey: "remote:github.com/acme/app",
+        projectName: "App",
+        checkout: {
+          cwd: "/repo/app",
+          isGit: true,
+          currentBranch: "main",
+          remoteUrl: "https://github.com/acme/app.git",
+          worktreeRoot: "/repo/app",
+          isPaseoOwnedWorktree: false,
+          mainRepoRoot: null,
+        },
+      },
+    });
+
+    expect(hostProjectFromWorkspace({ serverId: "host-a", workspace })).toMatchObject({
+      viewKey: JSON.stringify(["host-a", "project-a"]),
+      projectKey: "remote:github.com/acme/app",
+      hosts: [{ serverId: "host-a", projectId: "project-a" }],
+    });
+  });
 });