Add public mode

moneymgr_web/src/hooks/context_providers/PublicModeProvider.tsx

@@ -0,0 +1,34 @@
+import React, { PropsWithChildren } from "react";
+
+const localStorageKey = "public-mode";
+
+interface PublicModeContext {
+  enabled: boolean;
+  setEnabled: (enabled: boolean) => void;
+}
+
+const PublicModeContextK = React.createContext<PublicModeContext | null>(null);
+
+export function PublicModeProvider(p: PropsWithChildren): React.ReactElement {
+  const [enabled, setEnabled] = React.useState(
+    localStorage.getItem(localStorageKey) !== "false"
+  );
+
+  return (
+    <PublicModeContextK
+      value={{
+        enabled: enabled,
+        setEnabled(enabled) {
+          localStorage.setItem(localStorageKey, enabled ? "true" : "false");
+          setEnabled(enabled);
+        },
+      }}
+    >
+      {p.children}
+    </PublicModeContextK>
+  );
+}
+
+export function usePublicMode(): PublicModeContext {
+  return React.use(PublicModeContextK)!;
+}