refactor: migrate workspace tab actions to keyboard action dispatcher

packages/app/src/hooks/use-workspace-navigation.ts

@@ -0,0 +1,26 @@
+import { useCallback } from "react";
+import { router } from "expo-router";
+import { buildHostWorkspaceRoute } from "@/utils/host-routes";
+
+/**
+ * Navigate to a workspace screen. Uses router.navigate() which,
+ * combined with getId on the workspace Stack.Screen, ensures:
+ * - Only one instance of each workspace exists in the stack
+ * - History is preserved (back button works)
+ * - No duplicate workspace screens
+ */
+export function navigateToWorkspace(serverId: string, workspaceId: string) {
+  const href = buildHostWorkspaceRoute(serverId, workspaceId);
+  router.navigate(href as any);
+}
+
+export function useWorkspaceNavigation() {
+  return {
+    navigateToWorkspace: useCallback(
+      (serverId: string, workspaceId: string) => {
+        navigateToWorkspace(serverId, workspaceId);
+      },
+      []
+    ),
+  };
+}