fix: replace nested ternaries and remove type casts per review

- useNotificationForm: replace nested ternary with if/else if/else block
- TelegramProvider: type error as unknown and access properties safely
  via instanceof checks instead of casting to HTTPError

client/src/Hooks/useNotificationForm.ts

@@ -8,27 +8,30 @@ interface UseNotificationFormOptions {
 
 export const useNotificationForm = ({ data = null }: UseNotificationFormOptions = {}) => {
 	return useMemo(() => {
-		const defaults =
-			data?.type === "matrix"
-				? {
-						type: "matrix" as const,
-						notificationName: data.notificationName || "",
-						homeserverUrl: data.homeserverUrl || "",
-						roomId: data.roomId || "",
-						accessToken: data.accessToken || "",
-					}
-				: data?.type === "telegram"
-					? {
-							type: "telegram" as const,
-							notificationName: data.notificationName || "",
-							address: data.address || "",
-							accessToken: data.accessToken || "",
-						}
-					: {
-							type: (data?.type || "email") as Exclude<Notification["type"], "matrix" | "telegram">,
-							notificationName: data?.notificationName || "",
-							address: data?.address || "",
-						};
+		let defaults;
+
+		if (data?.type === "matrix") {
+			defaults = {
+				type: "matrix" as const,
+				notificationName: data.notificationName || "",
+				homeserverUrl: data.homeserverUrl || "",
+				roomId: data.roomId || "",
+				accessToken: data.accessToken || "",
+			};
+		} else if (data?.type === "telegram") {
+			defaults = {
+				type: "telegram" as const,
+				notificationName: data.notificationName || "",
+				address: data.address || "",
+				accessToken: data.accessToken || "",
+			};
+		} else {
+			defaults = {
+				type: (data?.type || "email") as Exclude<Notification["type"], "matrix" | "telegram">,
+				notificationName: data?.notificationName || "",
+				address: data?.address || "",
+			};
+		}
 
 		return { schema: notificationSchema, defaults };
 	}, [data]);