feat: integrate Google Analytics event tracking and update CSP for script sources (#30365)

Co-authored-by: CodingOnStar <hanxujiang@dify.ai>

web/global.d.ts

@@ -9,4 +9,22 @@ declare module 'lamejs/src/js/Lame';
 declare module 'lamejs/src/js/BitStream';
 declare module 'react-18-input-autosize';
 
-export { }
+declare global {
+  // Google Analytics gtag types
+  type GtagEventParams = {
+    [key: string]: unknown
+  }
+
+  type Gtag = {
+    (command: 'config', targetId: string, config?: GtagEventParams): void
+    (command: 'event', eventName: string, eventParams?: GtagEventParams): void
+    (command: 'js', date: Date): void
+    (command: 'set', config: GtagEventParams): void
+  }
+
+  // eslint-disable-next-line ts/consistent-type-definitions -- interface required for declaration merging
+  interface Window {
+    gtag?: Gtag
+    dataLayer?: unknown[]
+  }
+}