fixed some bugs, dark/white mode fix and sessionid in url

shared/page.ts

@@ -4,4 +4,12 @@ export function isSessionPage() {
 
 export function isRootPage() {
     return document.URL.indexOf("/sessions") == -1;
+}
+
+export function isSessionDetailPage() {
+    return document.URL.indexOf("/sessions") != -1 && document.URL.length > 40;
+}
+
+export function getSessionDetailsId() {
+    return document.URL.length > 40 ? document.URL.substring(document.URL.indexOf("/sessions/") + 10) : "";
 }