rename some files and add nip 94 widget

src/stores/stronghold.ts

@@ -0,0 +1,22 @@
+import { create } from 'zustand';
+import { createJSONStorage, persist } from 'zustand/middleware';
+
+interface StrongholdState {
+  privkey: null | string;
+  setPrivkey: (privkey: string) => void;
+}
+
+export const useStronghold = create<StrongholdState>()(
+  persist(
+    (set) => ({
+      privkey: null,
+      setPrivkey: (privkey: string) => {
+        set({ privkey: privkey });
+      },
+    }),
+    {
+      name: 'stronghold',
+      storage: createJSONStorage(() => sessionStorage),
+    }
+  )
+);