feat: Update dependencies and import maps

Upgrades React to v19.2.4 and adjusts ESM import maps to ensure correct versioning and loading. Also, removes redundant API key check in geminiService.ts as it's handled at build time.

services/geminiService.ts

@@ -2,11 +2,6 @@ import { GoogleGenAI, Type } from "@google/genai";
 import { Question } from "../types";
 
 const generateQuestions = async (topic: string, count: number = 5): Promise<Question[]> => {
-  if (!process.env.API_KEY) {
-    console.error("API Key is missing");
-    return [];
-  }
-
   const ai = new GoogleGenAI({ apiKey: process.env.API_KEY });
 
   try {
@@ -49,4 +44,4 @@ const generateQuestions = async (topic: string, count: number = 5): Promise<Ques
   }
 };
 
-export { generateQuestions };
+export { generateQuestions };