migrate current branch to query pattern (#116)

src/hooks/useCurrentBranch.ts

@@ -0,0 +1,30 @@
+import { IpcClient } from "@/ipc/ipc_client";
+import { useQuery } from "@tanstack/react-query";
+import type { BranchResult } from "@/ipc/ipc_types";
+
+export function useCurrentBranch(appId: number | null) {
+  const {
+    data: branchInfo,
+    isLoading,
+    refetch: refetchBranchInfo,
+  } = useQuery<BranchResult, Error>({
+    queryKey: ["currentBranch", appId],
+    queryFn: async (): Promise<BranchResult> => {
+      if (appId === null) {
+        // This case should ideally be handled by the `enabled` option
+        // but as a safeguard, and to ensure queryFn always has a valid appId if called.
+        throw new Error("appId is null, cannot fetch current branch.");
+      }
+      const ipcClient = IpcClient.getInstance();
+      return ipcClient.getCurrentBranch(appId);
+    },
+    enabled: appId !== null,
+    meta: { showErrorToast: false },
+  });
+
+  return {
+    branchInfo,
+    isLoading,
+    refetchBranchInfo,
+  };
+}