[Init] Initial commit - NetMesh terminal manager

application/state/sftp/sftpFocusStore.ts

@@ -0,0 +1,54 @@
+/**
+ * SFTP Focused Pane Store
+ * 
+ * Tracks which SFTP pane (left or right) is currently focused.
+ * This is used to determine which pane should receive keyboard shortcut actions.
+ */
+
+import { useSyncExternalStore } from "react";
+
+export type SftpFocusedSide = "left" | "right";
+
+type FocusListener = () => void;
+
+let focusedSide: SftpFocusedSide = "left";
+const focusListeners = new Set<FocusListener>();
+
+const notifyListeners = () => {
+  focusListeners.forEach((listener) => listener());
+};
+
+export const sftpFocusStore = {
+  getSnapshot: (): SftpFocusedSide => focusedSide,
+
+  subscribe: (listener: FocusListener) => {
+    focusListeners.add(listener);
+    return () => focusListeners.delete(listener);
+  },
+
+  /**
+   * Set the focused side
+   */
+  setFocusedSide: (side: SftpFocusedSide) => {
+    if (focusedSide !== side) {
+      focusedSide = side;
+      notifyListeners();
+    }
+  },
+
+  /**
+   * Get the current focused side
+   */
+  getFocusedSide: (): SftpFocusedSide => focusedSide,
+};
+
+/**
+ * React hook to subscribe to focused side changes
+ */
+export const useSftpFocusedSide = (): SftpFocusedSide => {
+  return useSyncExternalStore(
+    sftpFocusStore.subscribe,
+    sftpFocusStore.getSnapshot,
+    sftpFocusStore.getSnapshot
+  );
+};