feat(analytics): Add Firebase Analytics integration with page tracking

- Initialize Firebase Analytics with configuration and client-side setup
- Create GoogleAnalytics component to track page views on route changes
- Add analytics utility functions for tracking custom events (button clicks, form submissions, link clicks, searches)
- Integrate GoogleAnalytics component into home, not-found, and marketing layouts with Suspense boundary
- Add firebase dependency to package.json
- Enable automatic page view tracking with pathname and search parameters

lib/analytics.ts

@@ -0,0 +1,40 @@
+import { logEvent } from "firebase/analytics";
+import { analytics } from "./firebase";
+
+// Custom event tracking functions
+export const trackEvent = (
+  eventName: string,
+  eventParams?: Record<string, any>
+) => {
+  if (analytics) {
+    logEvent(analytics, eventName, eventParams);
+  }
+};
+
+// Common event trackers
+export const trackButtonClick = (buttonName: string, location?: string) => {
+  trackEvent("button_click", {
+    button_name: buttonName,
+    location: location || "unknown",
+  });
+};
+
+export const trackFormSubmit = (formName: string, success: boolean) => {
+  trackEvent("form_submit", {
+    form_name: formName,
+    success,
+  });
+};
+
+export const trackLinkClick = (linkUrl: string, linkText?: string) => {
+  trackEvent("link_click", {
+    link_url: linkUrl,
+    link_text: linkText || "unknown",
+  });
+};
+
+export const trackSearch = (searchTerm: string) => {
+  trackEvent("search", {
+    search_term: searchTerm,
+  });
+};

lib/firebase.ts

@@ -0,0 +1,25 @@
+import { Analytics, getAnalytics } from "firebase/analytics";
+import { getApps, initializeApp } from "firebase/app";
+
+const firebaseConfig = {
+  apiKey: "AIzaSyCTjdsk2jE34IfnvSKP1JMTIf_Abd7tbt0",
+  authDomain: "opplens-270d1.firebaseapp.com",
+  projectId: "opplens-270d1",
+  storageBucket: "opplens-270d1.firebasestorage.app",
+  messagingSenderId: "6923326255",
+  appId: "1:6923326255:web:cb4f630d92a286daed87da",
+  measurementId: "G-TMLH6BM963",
+};
+
+// Initialize Firebase
+const app =
+  getApps().length === 0 ? initializeApp(firebaseConfig) : getApps()[0];
+
+let analytics: Analytics | null = null;
+
+// Initialize Analytics only on client side
+if (typeof window !== "undefined") {
+  analytics = getAnalytics(app);
+}
+
+export { analytics, app };