remove unused stuff, refactor frontend folder structure

client/ui/frontend/src/contexts/NavSectionContext.tsx

@@ -0,0 +1,29 @@
+import { createContext, useContext, useState, type ReactNode } from "react";
+
+export type NavSection = "peers" | "networks" | "exitNode";
+
+type NavSectionContextValue = {
+    section: NavSection;
+    setSection: (s: NavSection) => void;
+};
+
+const NavSectionContext = createContext<NavSectionContextValue | null>(null);
+
+export const useNavSection = (): NavSectionContextValue => {
+    const ctx = useContext(NavSectionContext);
+    if (!ctx) {
+        throw new Error(
+            "useNavSection must be used inside NavSectionProvider",
+        );
+    }
+    return ctx;
+};
+
+export const NavSectionProvider = ({ children }: { children: ReactNode }) => {
+    const [section, setSection] = useState<NavSection>("peers");
+    return (
+        <NavSectionContext.Provider value={{ section, setSection }}>
+            {children}
+        </NavSectionContext.Provider>
+    );
+};