Make New Workspace an app-wide screen (#1746)

* fix(app): make new workspace global

New Workspace now opens as an app-wide screen. Host and project context can still preselect the form through query params, but the route itself no longer lives under a host.

* fix(app): simplify new workspace selection

packages/app/src/hooks/use-global-new-workspace-action.ts

@@ -2,27 +2,29 @@ import { useCallback } from "react";
 import { router } from "expo-router";
 import { useKeyboardActionHandler } from "@/hooks/use-keyboard-action-handler";
 import type { KeyboardActionId } from "@/keyboard/keyboard-action-dispatcher";
+import { useHosts } from "@/runtime/host-runtime";
 import { useActiveWorkspaceSelection } from "@/stores/navigation-active-workspace-store";
-import { buildHostNewWorkspaceRoute } from "@/utils/host-routes";
+import { buildNewWorkspaceRoute } from "@/utils/host-routes";
 
 const WORKSPACE_NEW_ACTIONS: readonly KeyboardActionId[] = ["workspace.new"];
 
 export function useGlobalNewWorkspaceAction() {
   const selection = useActiveWorkspaceSelection();
   const serverId = selection?.serverId ?? null;
+  const hosts = useHosts();
 
   const handle = useCallback(() => {
-    if (!serverId) {
+    if (hosts.length === 0) {
       return false;
     }
-    router.navigate(buildHostNewWorkspaceRoute(serverId) as never);
+    router.navigate(buildNewWorkspaceRoute(serverId ? { serverId } : undefined) as never);
     return true;
-  }, [serverId]);
+  }, [hosts.length, serverId]);
 
   useKeyboardActionHandler({
     handlerId: "workspace-new-global",
     actions: WORKSPACE_NEW_ACTIONS,
-    enabled: serverId !== null,
+    enabled: hosts.length > 0,
     priority: 0,
     handle,
   });