Major: Added Authentication Functionality, interfaces with backend;

Added new styles to HomePage & VideoPage;
Added AuthContext to persist logged_in status;

frontend/src/context/AuthContext.tsx

@@ -0,0 +1,18 @@
+import { createContext, useContext } from "react";
+
+interface AuthContextType {
+  isLoggedIn: boolean;
+  setIsLoggedIn: (value: boolean) => void;
+}
+
+export const AuthContext = createContext<AuthContextType | undefined>(
+  undefined
+);
+
+export function useAuth() {
+  const context = useContext(AuthContext);
+  if (context === undefined) {
+    throw new Error("useAuth must be used within an AuthProvider");
+  }
+  return context;
+}