Improving typings

This PR solves a number of issues (but not all) found when enabling the rule ESLint rule "@typescript-eslint/no-unsafe-call" in the front.

front/src/Administration/AnalyticsClient.ts

@@ -3,8 +3,7 @@ import { POSTHOG_API_KEY, POSTHOG_URL } from "../Enum/EnvironmentVariable";
 declare let window: any;
 
 class AnalyticsClient {
-    // eslint-disable-next-line @typescript-eslint/no-explicit-any
-    private posthogPromise: Promise<any> | undefined;
+    private posthogPromise: Promise<typeof import("posthog-js").default> | undefined;
 
     constructor() {
         if (POSTHOG_API_KEY && POSTHOG_URL) {

front/src/WebRtc/JitsiFactory.ts

@@ -30,7 +30,7 @@ interface JitsiApi {
 
     addListener: (type: string, callback: Function) => void;
     removeListener: (type: string, callback: Function) => void;
-
+    getParticipantsInfo(): { displayName: string; participantId: string }[];
     dispose: () => void;
 }
 
@@ -275,10 +275,11 @@ class JitsiFactory {
     }
 
     private onDominantSpeakerChanged(data: { id: string }): void {
-        userIsJitsiDominantSpeakerStore.set(
-            //@ts-ignore
-            data.id === this.getCurrentParticipantId(this.jitsiApi?.getParticipantsInfo())
-        );
+        if (this.jitsiApi) {
+            userIsJitsiDominantSpeakerStore.set(
+                data.id === this.getCurrentParticipantId(this.jitsiApi.getParticipantsInfo())
+            );
+        }
     }
 
     private onParticipantsCountChange(): void {