fix(projects): harden host and remote identity

packages/app/src/projects/project-settings-target.test.ts

@@ -17,4 +17,22 @@ describe("project settings target", () => {
   it("keeps a host-local route valid after the structural key changes", () => {
     expect(findProjectSettingsTarget([project], "host:host-a:project:prj_1234")).toBe(project);
   });
+
+  it("keeps legacy project IDs scoped to their host", () => {
+    const legacyKey = "remote:github.com/acme/app";
+    const unchangedProject = {
+      projectKey: legacyKey,
+      hosts: [{ serverId: "host-a", projectId: legacyKey }],
+    };
+    const changedProject = {
+      projectKey: "remote:github.com/acme/app-fork",
+      hosts: [{ serverId: "host-b", projectId: legacyKey }],
+    };
+
+    const routeKey = resolveProjectSettingsRouteKey(changedProject);
+    expect(routeKey).toBe(`host:host-b:project:${legacyKey}`);
+    expect(findProjectSettingsTarget([unchangedProject, changedProject], routeKey)).toBe(
+      changedProject,
+    );
+  });
 });

packages/app/src/projects/project-settings-target.ts

@@ -1,5 +1,3 @@
-import { resolveProjectGroupKey } from "./project-group-key";
-
 interface ProjectSettingsTarget {
   projectKey: string;
   hosts: ReadonlyArray<{ serverId: string; projectId?: string }>;
@@ -8,7 +6,7 @@ interface ProjectSettingsTarget {
 function resolveHostLocalProjectKey(host: { serverId: string; projectId?: string }): string | null {
   const projectId = host.projectId?.trim();
   if (!projectId) return null;
-  return resolveProjectGroupKey({ serverId: host.serverId, projectId });
+  return `host:${host.serverId}:project:${projectId}`;
 }
 
 export function resolveProjectSettingsRouteKey(project: ProjectSettingsTarget): string {