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/stores/navigation-active-workspace-store/navigation.ts

@@ -58,10 +58,16 @@ function parseWorkspaceSelectionFromRouteParams(params: {
 export function parseActiveWorkspaceSelection(
   input: RouteSelectionInput,
 ): ActiveWorkspaceSelection | null {
-  return (
-    parseHostWorkspaceRouteFromPathname(input.pathname) ??
-    parseWorkspaceSelectionFromRouteParams(input.params)
-  );
+  const routeSelection = parseHostWorkspaceRouteFromPathname(input.pathname);
+  if (routeSelection) {
+    return routeSelection;
+  }
+
+  if (input.pathname !== "/" && input.pathname !== "") {
+    return null;
+  }
+
+  return parseWorkspaceSelectionFromRouteParams(input.params);
 }
 
 export function navigateToWorkspace(