Keep composer autocomplete visible after route hops (#1851)

* fix(app): keep composer autocomplete visible after route hops

Workspace callers now express only the target workspace. The navigation helper chooses whether to pop to a mounted host route or fall back, and active-workspace tracking ignores stale hidden route params while app-wide routes are foregrounded.

* test(app): address workspace navigation review

* fix(app): parse decoded legacy workspace routes

* fix(app): ignore decoded legacy tab routes

* test(app): use canonical offline workspace route

packages/app/src/screens/new-workspace-screen.tsx

@@ -1147,7 +1147,6 @@ function submitWorkspaceDraft(input: SubmitDraftInput): void {
   navigateToPreparedWorkspaceTab({
     serverId,
     workspaceId,
-    currentPathname: "/new",
     target: submission.target,
   });
   useDraftStore.getState().clearDraftInput({ draftKey, lifecycle: "sent" });
@@ -1994,7 +1993,7 @@ export function NewWorkspaceScreen({
             ensureWorkspace,
             serverId: selectedServerId,
             navigate: (targetServerId, workspaceId) =>
-              navigateToWorkspace(targetServerId, workspaceId, { currentPathname: "/new" }),
+              navigateToWorkspace(targetServerId, workspaceId),
           });
           return;
         }